Details of the Researcher

PHOTO

Megumi Matsumoto
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • 博士（理学）（神戸大学）

  • 修士（理学）（神戸大学）

e-Rad No.
50725455

Research History 3

  • 2018/06 - Present
    Tohoku University　Graduate School of Science　Assistant Prof.

  • 2017/04 - 2018/05
    Kyoto University　Mineralogical laboratory

  • 2013/10 - 2017/03
    Kobe University　Research Facility Center for Science and Technology

Education 3

  • Kobe University　Graduate School of Science　Earth and Planetary Sciences

    2012/04 - 2013/09

  • Kobe University　Graduate School of Science　Earth and Planetary Sciences

    2010/04 - 2012/03

  • Kobe University　Faculty of Science　Earth and Planetary Sciences

    2006/04 - 2010/03

Professional Memberships 3

  • Meteoritical Society

    2018 - Present

  • JAPAN GEOSCIENCE UNION

  • Japan Association of Mineralogical Sciences

Research Interests 3

  • TEM

  • planetary material science

  • carbonaceous chondrite

Research Areas 1

  • Natural sciences / Solid earth science / Planetary materials science

Papers 49

  1. Methylene‐to‐methyl ratio variability in Ryugu samples: Clues to a heterogeneous aqueous alteration

    Zélia Dionnet, Zahia Djouadi, Lukas Delaye, Lucas Caron, Rosario Brunetto, Alice Aléon‐Toppani, Cateline Lantz, Stefano Rubino, Donia Baklouti, Tomoki Nakamura, Ferenc Borondics, Christophe Sandt, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Seiichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　60　(2)　273-285　2024/12/24

    Publisher: Wiley

    DOI： 10.1111/maps.14304 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract Understanding the processes of aqueous alteration within primitive bodies is crucial for unraveling the complex history of early planetesimals. To better identify the signs of this process and its consequences, we have studied the heterogeneity at a micrometric scale of the structure of the aliphatic organic compounds and its relationship to its mineralogical environment. Here, we report an analysis performed on two micrometric grains of Ryugu (C0002‐FC027 and C0002‐FC028). The samples were crushed in a diamond compression cell and analyzed using high‐spatial resolution Fourier Transform InfraRed (FT‐IR) hyperspectral imaging measurements conducted in transmission mode. We showed here the spatial distributions of the main components and the structural heterogeneity of the aliphatic organic matter highlighting a micrometer‐scale variability in the methylene‐to‐methyl ratio. Moreover, we connected this heterogeneity to the one of the phyllosilicate band positions. Our findings indicate that the organic matter within Ryugu's micrometric grains underwent varying degrees of aqueous alteration in distinct microenvironments resulting in an elongation of the length of their aliphatic chains, and/or a reduction in their branching and/or cross‐linking.

  2. Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu

    Bradley De Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, Corentin Le Guillou, Larry R. Nittler, Jens Barosch, Hikaru Yabuta, Zita Martins, Yoko Kebukawa, Taiga Okumura, Minako Hashiguchi, Shohei Yamashita, Yasuo Takeichi, Yoshio Takahashi, Daisuke Wakabayashi, Cécile Engrand, Laure Bejach, Lydie Bonal, Eric Quirico, Laurent Remusat, Jean Duprat, Maximilien Verdier-Paoletti, Smail Mostefaoui, Mutsumi Komatsu, Jérémie Mathurin, Alexandre Dazzi, Ariane Deniset-Besseau, Emmanuel Dartois, Yusuke Tamenori, Hiroki Suga, Gilles Montagnac, Kanami Kamide, Miho Shigenaka, Megumi Matsumoto, Yuma Enokido, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

    Nature Communications　15　(1)　2024/08/29

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-024-51731-w 　

    eISSN： 2041-1723

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    Abstract Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended hydrothermal processing. Surface regolith collected by the Hayabusa2 spacecraft from the carbon-rich asteroid 162173 Ryugu present a unique opportunity to untangle the sources and processing history of carbonaceous matter. Here we show carbonaceous grains in Ryugu can be classified into three main populations defined by spectral shape: Highly aromatic (HA), Alkyl-Aromatic (AA), and IOM-like (IL). These carbon populations may be related to primordial chemistry, since C and N isotopic compositions vary between the three groups. Diffuse carbon is occasionally dominated by molecular carbonate preferentially associated with coarse-grained phyllosilicate minerals. Compared to related carbonaceous meteorites, the greater diversity of organic functional chemistry in Ryugu indicate the pristine condition of these asteroid samples.

  3. Microscale hydrogen, carbon, and nitrogen isotopic diversity of organic matter in asteroid Ryugu

    Larry R Nittler, Jens Barosch, Katherine Burgess, Rhonda M Stroud, Jianhua Wang, Hikaru Yabuta, Yuma Enokido, Megumi Matsumoto, Tomoki Nakamura, Yoko Kebukawa, Shohei Yamashita, Yoshio Takahashi, Laure Bejach, Lydie Bonal, George D Cody, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset-Besseau, Jean Duprat, Cécile Engrand, Minako Hashiguchi, A.L. David Kilcoyne, Mutsumi Komatsu, Zita Martins, Jérémie Mathurin, Gilles Montagnac, Smail Mostefaoui, Taiga Okumura, Eric Quirico, Laurent Remusat, Scott Sandford, Miho Shigenaka, Hiroki Suga, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Daisuke Wakabayashi, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Tomohiro Usui, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

    Earth and Planetary Science Letters　637　118719-118719　2024/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.epsl.2024.118719 　

    ISSN： 0012-821X

  4. Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body

    Akira Tsuchiyama, Megumi Matsumoto, Junya Matsuno, Masahiro Yasutake, Tomoki Nakamura, Takaaki Noguchi, Akira Miyake, Kentaro Uesugi, Akihisa Takeuchi, Shota Okumura, Yuri Fujioka, Mingqi Sun, Aki Takigawa, Toru Matsumoto, Satomi Enju, Itaru Mitsukawa, Yuma Enokido, Tatsuhiko Kawamoto, Takeshi Mikouchi, Tatsuhiro Michikami, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Stefano Rubino, Zelia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Michael E. Zolensky, Tsukasa Nakano, Naoto Nakano, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

    Geochimica et Cosmochimica Acta　375　146-172　2024/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.gca.2024.03.032 　

    ISSN： 0016-7037

  5. Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes

    Alice Aléon-Toppani, Rosario Brunetto, Zélia Dionnet, Stefano Rubino, Donia Baklouti, François Brisset, Maxime Vallet, Eva Heripre, Tomoki Nakamura, Cateline Lantz, Zahia Djouadi, Ferenc Borondics, Christophe Sandt, David Troadec, Obadias Mivumbi, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohira Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

    Geochimica et Cosmochimica Acta　371　1-30　2024/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.gca.2024.02.006 　

    ISSN： 0016-7037

  6. AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

    Jérémie Mathurin, Laure Bejach, Emmanuel Dartois, Cécile Engrand, Alexandre Dazzi, Ariane Deniset-Besseau, Jean Duprat, Yoko Kebukawa, Hikaru Yabuta, Lydie Bonal, Eric Quirico, Christophe Sandt, Ferenc Borondics, Jens Barosch, Pierre Beck, D. George Cody, T. Brad De Gregorio, Minako Hashiguchi, A.L. David Kilcoyne, Mutsumi Komatsu, Zita Martins, Megumi Matsumoto, Gilles Montagnac, Smail Mostefaoui, R. Larry Nittler, Takuji Ohigashi, Taiga Okumura, T.H. Van Phan, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Takaaki Noguchi, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hisayoshi Yurimoto, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Shogo Tachibana, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa

    Astronomy & Astrophysics　2024/02/26

    Publisher: EDP Sciences

    DOI： 10.1051/0004-6361/202347435 　

    ISSN： 0004-6361

    eISSN： 1432-0746

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    The JAXA Hayabusa2 mission returned well-preserved samples collected from the carbonaceous asteroid Ryugu, providing unique non-terrestrially weathered samples from a known parent body. This work aims to provide a better understanding of the formation and evolution of primitive asteroidal matter by studying the fine scale association of organic matter and minerals in Ryugu samples. We characterized the samples by IR nanospectroscopy using the AFM-IR technique. This technique overcomes the diffraction limit (of several microns) of conventional infrared microspectroscopy (µ-FTIR). The samples were mapped in the mid-IR range at a lateral spatial resolution about a hundred times better than with µ-FTIR. This provided us with unique in situ access to the distribution of the different infrared signatures of organic components at the sub-micron scale present in the Ryugu whole-rock samples as well as to the characterization of the compositional variability of Ryugu in the insoluble organic matter (IOM) chemically extracted from the Ryugu samples. The AFM-IR maps of whole-rock particles and IOM residues from Ryugu samples were recorded with a lateral resolution of tens of nanometers. Spectra were recorded in the 1900-900 cm$^−1$ spectral range by AFM-IR (Icon-IR) for all samples, and additional spectra were recorded from 2700 to 4000 cm$^−1$ for one IOM sample by an optical photothermal IR (O-PTIR) technique using a mIRage$^ textregistered $ IR microscope. Organic matter is present in two forms in the whole-rock samples: as a diffuse phase intermixed with the phyllosilicate matrix and as individual organic nanoparticles. We identify the Ryugu organic nanoparticles as nanoglobule-like inclusions texturally resembling nanoglobules present in primitive meteorites. Using AFM-IR, we record for the first time the infrared spectra of Ryugu organic nanoparticles that clearly show enhanced carbonyl (C=O) and CH contributions with respect to the diffuse organic matter in Ryugu whole-rock and IOM residue.

  7. Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

    Toru Matsumoto, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Dennis Harries, Aki Takigawa, Yusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Pierre Beck, Thi H.V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei Ichiro Watanabe, Yuichi Tsuda

    Nature Astronomy　8　(2)　207-215　2024/02

    DOI： 10.1038/s41550-023-02137-z 　

    eISSN： 2397-3366

  8. Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro‐ to nano‐scale

    Rhonda M. Stroud, Jens Barosch, Lydie Bonal, Katherine Burgess, George D. Cody, Bradley T. De Gregorio, Luke Daly, Emmanuel Dartois, Elena Dobrică, Jean Duprat, Cecile Engrand, Dennis Harries, Minako Hashiguchi, Hope Ishii, Yoko Kebukawa, A. David Kilcoyne, Falko Langenhorst, Martin R. Lee, Larry R. Nittler, Eric Quirico, Taiga Okumura, Laurent Remusat, Scott Sandford, Hikaru Yabuta, Masanao Abe, Neyda M. Abreu, Paul A. J. Bagot, Pierre Beck, Laure Bejach, Phil A. Bland, John C. Bridges, Brittany A. Cymes, Alexandre Dazzi, Francisco de la Peña, Ariane Deniset‐Besseau, Satomi Enju, Yuma Enokido, David R. Frank, Jennifer Gray, Mitsutaka Haruta, Satoshi Hata, Leon Hicks, Yohei Igami, Damien Jacob, Kanami Kamide, Mutsumi Komatsu, Sylvain Laforet, Hugues Leroux, Corentin Le Guillou, Zita Martins, Maya Marinova, James Martinez, Jérémie Mathurin, Megumi Matsumoto, Toru Matsumoto, Junya Matsuno, Samuel McFadzean, Tatsuhiro Michikami, Itaru Mitsukawa, Akira Miyake, Masaaki Miyahara, Akiko Miyazaki, Gilles Montagnac, Smail Mostefaoui, Tomoki Nakamura, Aiko Nakato, Hiroshi Naraoka, Yusuke Nakauchi, Satoru Nakazawa, Masahiro Nishimura, Takaaki Noguchi, Kenta Ohtaki, Takuji Ohigashi, Tatsuaki Okada, Shota Okumura, Ryuji Okazaki, Thi H. V. Phan, Rolando Rebois, Kanako Sakamoto, Takanao Saiki, Hikaru Saito, Yusuke Seto, Miho Shigenaka, William Smith, Hiroki Suga, Mingqi Sun, Shogo Tachibana, Yoshio Takahashi, Yasuo Takeichi, Akihisa Takeuchi, Aki Takigawa, Yusuke Tamenori, Satoshi Tanaka, Fuyuto Terui, Michelle S. Thompson, Naotaka Tomioka, Akira Tsuchiyama, Yuichi Tsuda, Kentaro Uesugi, Masayuki Uesugi, Tomohiro Usui, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Sei‐ichiro Watanabe, Toru Yada, Shohei Yamashita, Masahiro Yasutake, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Pierre‐M. Zanetta, Thomas Zega, Michael E. Zolensky

    Meteoritics & Planetary Science　2024/01/25

    Publisher: Wiley

    DOI： 10.1111/maps.14128 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range of morphologies, elemental compositions, and carbon functional chemistries consistent with those of carbonaceous chondrites that have experienced low‐temperature aqueous alteration. Both nanoglobules and diffuse organic matter are abundant. Non‐globular organic particles are also present, and including some that contain nanodiamond clusters. Diffuse organic matter is finely distributed in and around phyllosilicates, forms coatings on other minerals, and is also preserved in vesicles in secondary minerals such as carbonate and pyrrhotite. The average elemental compositions determined by energy‐dispersive spectroscopy of extracted, demineralized insoluble organic matter samples A0107 and C0106 are C100N3O9S1 and C100N3O7S1, respectively, with the difference in O/C slightly outside the difference in the standard error of the mean. The functional chemistry of the nanoglobules varies from mostly aromatic C=C to mixtures of aromatic C=C, ketone C=O, aliphatic (CHn), and carboxyl (COOH) groups. Diffuse organic matter associated with phyllosilicates has variable aromatic C, ketone and carboxyl groups, and some localized aliphatics, but is dominated by molecular carbonate (CO3) absorption, comparable to prior observations of clay‐bound organic matter in CI meteorites.

  9. Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu

    Megumi Matsumoto, Junya Matsuno, Akira Tsuchiyama, Tomoki Nakamura, Yuma Enokido, Mizuha Kikuiri, Aiko Nakato, Masahiro Yasutake, Kentaro Uesugi, Akihisa Takeuchi, Satomi Enju, Shota Okumura, Itaru Mitsukawa, Mingqi Sun, Akira Miyake, Mitsutaka Haruta, Yohei Igami, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Michael Zolensky, Toru Yada, Masahiro Nishimura, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

    Science Advances　10　(3)　2024/01/19

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.adi7203 　

    eISSN： 2375-2548

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    The Hayabusa2 spacecraft delivered samples of the carbonaceous asteroid Ryugu to Earth. Some of the sample particles show evidence of micrometeoroid impacts, which occurred on the asteroid surface. Among those, particles A0067 and A0094 have flat surfaces on which a large number of microcraters and impact melt splashes are observed. Two impact melt splashes and one microcrater were analyzed to unveil the nature of the objects that impacted the asteroid surface. The melt splashes consist mainly of Mg-Fe–rich glassy silicates and Fe-Ni sulfides. The microcrater trapped an impact melt consisting mainly of Mg-Fe–rich glassy silicate, Fe-Ni sulfides, and minor silica-rich glass. These impact melts show a single compositional trend indicating mixing of Ryugu surface materials and impactors having chondritic chemical compositions. The relict impactor in one of the melt splashes shows mineralogical similarity with anhydrous chondritic interplanetary dust particles having a probable cometary origin. The chondritic micrometeoroids probably impacted the Ryugu surface during its residence in a near-Earth orbit.

  10. In situ investigation of an organic micro‐globule and its mineralogical context within a Ryugu “sand” grain

    Van T. H. Phan, Pierre Beck, Rolando Rebois, Eric Quirico, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Jérémie Mathurin, Alexandre Dazzi, Emmanuel Dartois, Cécile Engrand, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Peter Hoppe, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　2024/01/08

    Publisher: Wiley

    DOI： 10.1111/maps.14122 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract The Hayabusa2 mission from the Japan Aerospace Exploration Agency (JAXA) returned to the Earth samples of carbonaceous asteroid (162173) Ryugu. This mission offers a unique opportunity to investigate in the laboratory samples from a C‐type asteroid, without physical or chemical alteration by the terrestrial atmosphere. Here, we report on an investigation of the mineralogy and the organo‐chemistry of Hayabusa2 samples using a combination of micro‐ and nano‐infrared spectroscopy. Particles investigated with conventional FTIR spectroscopy have spectra dominated by phyllosilicate‐related absorption, as observed for samples of CI‐chondrites, selected ungrouped carbonaceous chondrites, and selected hydrated micrometeorites. Ryugu samples show smaller sulfate‐related absorption than CI‐chondrites. Our samples that were only briefly exposed to the Earth atmosphere show absorptions related to molecular water, revealing fast terrestrial contamination of the spectral signature at 3 μm. Overall, our FTIR data are in agreement with other work done on Ryugu samples, revealing a low degree of mineralogical variability across Ryugu samples. AFM‐IR mapping of the grains shows the presence of a micrometer‐sized organic globule in one of our analyzed grains. The AFM‐IR spectra obtained on this globule are similar to IR spectra obtained on IOM suggesting that it is constituted of refractory organic matter. This globule may host silicate in its interior, with a different mineralogy than bulk Ryugu phyllosilicate. The shape, presence of peculiar silicate, and the nature of organic constituting the globule point toward a pre‐accretionary origin of this globule and that at least part of Ryugu organics were inherited from the protosolar nebulae or the interstellar media. Altogether, our results show the similarities between Ryugu samples and CI chondrites.

  11. Four‐dimensional‐STEM analysis of the phyllosilicate‐rich matrix of Ryugu samples

    Bahae‐eddine Mouloud, Damien Jacob, Francisco de la Peña, Maya Marinova, Corentin Le Guillou, Jean‐Christophe Viennet, Sylvain Laforet, Hugues Leroux, Adrien Teurtrie, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrica, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　2024/01/05

    Publisher: Wiley

    DOI： 10.1111/maps.14124 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract Ryugu asteroid grains brought back to the Earth by the Hayabusa2 space mission are pristine samples containing hydrated minerals and organic compounds. Here, we investigate the mineralogy of their phyllosilicate‐rich matrix with four‐dimensional scanning transmission electron microscopy (4D‐STEM). We have identified and mapped the mineral phases at the nanometer scale (serpentine, smectite, pyrrhotite), observed the presence of Ni‐bearing pyrrhotite, and identified the serpentine polymorph as lizardite, in agreement with the reported aqueous alteration history of Ryugu. Furthermore, we have mapped the d‐spacings of smectite and observed a broad distribution of values, ranging from 1 to 2 nm, with an average d‐spacing of 1.24 nm, indicating significant heterogeneity within the sample. Such d‐spacing variability could be the result of either the presence of organic matter trapped in the interlayers or the influence of various geochemical conditions at the submicrometer scale, suggestive of a range of organic compounds and/or changes in smectite crystal chemistry.

  12. Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite

    Dennis Harries, Toru Matsumoto, Falko Langenhorst, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Aki Takigawa, Yusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Bahae eddine Mouloud, Maya Marinova, Pierre Beck, Van T.H. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei ichiro Watanabe, Yuichi Tsuda

    Meteoritics and Planetary Science　2024

    DOI： 10.1111/maps.14176 　

    ISSN： 1086-9379

  13. Sodium carbonates on Ryugu as evidence of highly saline water in the outer Solar System

    Toru Matsumoto, Takaaki Noguchi, Akira Miyake, Yohei Igami, Megumi Matsumoto, Toru Yada, Masayuki Uesugi, Masahiro Yasutake, Kentaro Uesugi, Akihisa Takeuchi, Hayato Yuzawa, Takuji Ohigashi, Tohru Araki

    Nature Astronomy　2024

    DOI： 10.1038/s41550-024-02418-1 　

    eISSN： 2397-3366

  14. Mineralogy and petrology of fine‐grained samples recovered from the asteroid (162173) Ryugu

    Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Bahae‐Eddine Mouloud, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, William A. Smith, Sam McFadzean, Pierre‐Etienne Martin, Paul A. J. Bagot, Dennis Fougerouse, David W. Saxey, Steven Reddy, William D. A. Rickard, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Peter Hoppe, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　2023/11/22

    Publisher: Wiley

    DOI： 10.1111/maps.14093 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fine‐grained Ryugu samples allocated to our “Sand” team and report additional space weathering features found on the grains. The dominant mineralogy is composed of a fine‐grained mixture of Mg‐rich saponite and serpentine, magnetite, pyrrhotite, pentlandite, dolomite, and Fe‐bearing magnesite. These grains have mineralogy comparable to that of CI chondrites, showing severe aqueous alteration but lacking ferrihydrite and sulfate. These results are similar to previous works on large Ryugu grains. In addition to the major minerals, we also find many minerals that are rare or have not been reported among CI chondrites. Accessory minerals identified are hydroxyapatite, Mg‐Na phosphate, olivine, low‐Ca pyroxene, Mg‐Al spinel, chromite, manganochromite, eskolaite, ilmenite, cubanite, polydymite, transjordanite, schreibersite, calcite, moissanite, and poorly crystalline phyllosilicate. We also show scanning transmission electron microscope and scanning electron microscope compositional maps and images of some space‐weathered grains and severely heated and melted grains. Although our mineralogical results are consistent with that of millimeter‐sized grains, the fine‐grained fraction is best suited to investigate impact‐induced space weathering.

  15. Phyllosilicates with embedded Fe‐based nanophases in Ryugu and Orgueil

    Hugues Leroux, Corentin Le Guillou, Maya Marinova, Sylvain Laforet, Jean‐Christophe Viennet, Bahae‐Eddine Mouloud, Adrien Teurtrie, Francisco de la Peña, Damien Jacob, Daniel Hallatt, Mario Pelaez Fernandez, David Troadec, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐Ichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　2023/11/14

    Publisher: Wiley

    DOI： 10.1111/maps.14101 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract Samples were recently collected from the carbonaceous asteroid (162173) Ryugu, by the Japan Aerospace Exploration Agency (JAXA) Hayabusa2 mission. They resemble CI chondrites material, thus showing clear evidence of extensive aqueous alteration attested by the widespread presence of a mixture of serpentine and saponite. We present here a scanning transmission electron microscopy study of the Ryugu dominant lithology of the phyllosilicate matrix at the nanometer scale, which we compare with that of the Orgueil CI chondrite. In both objects, the phyllosilicates are of comparable nature and texture, consisting of a mixture of small‐sized crystallites of serpentine and saponite. At the micrometer scale or less, the texture is an alternation of fine and coarse domains. The fine‐grained regions are dominated by saponite. In Ryugu, they enclose numerous Fe,Ni nanosulfides, whereas in Orgueil, S‐ and Ni‐rich ferrihydrite is abundant. The coarse‐grained regions contain more serpentine and no or little Fe,Ni sulfides or ferrihydrite. Scanning transmission x‐ray microscopy at the Fe‐L3 edge also reveals that iron valency of phyllosilicates is higher and more homogeneous in Orgueil (~70% Fe3+) than in Ryugu (<50% Fe3+). We interpret the observed textures as being mostly a consequence of aqueous alteration, likely resulting from the replacement by phyllosilicates of submicrometric components, initially agglomerated by a primary accretion. The fine‐grained domains may result from the replacement of GEMS (GEMS—glass with embedded metal and sulfides) objects or from other types of nanometric assemblages of silicate and Fe‐based nanophases. On the other hand, the coarse‐grained regions may correspond to the replacement of anhydrous crystalline silicates of the olivine and pyroxene type. The major difference is the presence of Fe,Ni sulfides in Ryugu and of ferrihydrite and higher iron valency of phyllosilicates in Orgueil. This might be due to long‐term terrestrial weathering that would have destabilized the nanosulfides. We also explore an alternative scenario involving more oxidizing hydrothermal conditions on the Orgueil parent body.

  16. Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples

    Eric Quirico, Lydie Bonal, Yoko Kebukawa, Kana Amano, Hikaru Yabuta, Van T. H. Phan, Pierre Beck, Laurent Rémusat, Emmanuel Dartois, Cecile Engrand, Zita Martins, Laure Bejach, Alexandre Dazzi, Ariane Deniset‐Besseau, Jean Duprat, Jérémie Mathurin, Gilles Montagnac, Jens Barosch, George D. Cody, Bradley De Gregorio, Yuma Enokido, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Mutsumi Komatsu, Megumi Matsumoto, Smail Mostefaoui, Larry Nittler, Takuji Ohigashi, Taiga Okumura, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Shohei Yamashita, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Kanako Sakamoto, Shogo Tachibana, Sei‐Ichiro Watanabe, Yuichi Tsuda, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohitro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa

    Meteoritics & Planetary Science　2023/11/13

    Publisher: Wiley

    DOI： 10.1111/maps.14097 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract We report a Fourier transform infrared analysis of functional groups in insoluble organic matter (IOM) extracted from a series of 100–500 μm Ryugu grains collected during the two touchdowns of February 22 and July 11, 2019. IOM extracted from most of the samples is very similar to IOM in primitive CI, CM, and CR chondrites, and shows that the extent of thermal metamorphism in Ryugu regolith was, at best, very limited. One sample displays chemical signatures consistent with a very mild heating, likely due to asteroidal collision impacts. We also report a lower carbonyl abundance in Ryugu IOM samples compared to primitive chondrites, which could reflect the accretion of a less oxygenated precursor by Ryugu. The possible effects of hydrothermal alteration and terrestrial weathering are also discussed. Last, no firm conclusions could be drawn on the origin of the soluble outlier phases, observed along with IOM in this study and in the preliminary analysis of Ryugu samples. However, it is clear that the HF/HCl residues presented in this publication are a mix between IOM and the nitrogen‐rich outlier phase.

  17. Three‐dimensional multiscale assembly of phyllosilicates, organics, and carbonates in small Ryugu fragments

    Zelia Dionnet, Stefano Rubino, Alice Aléon‐Toppani, Rosario Brunetto, Akira Tsuchiyama, Cateline Lantz, Zahia Djouadi, Donia Baklouti, Tomoki Nakamura, Ferenc Borondics, Christophe Sandt, Eva Heripre, David Troadec, Obadias Mivumbi, Jérome Aléon, Theo Ternier, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Seiichiro Watanabe, Yuichi Tsuda

    Meteoritics & Planetary Science　2023/09

    Publisher: Wiley

    DOI： 10.1111/maps.14068 　

    ISSN： 1086-9379

    eISSN： 1945-5100

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    Abstract We report μm‐scale nondestructive infrared (IR) hyperspectral results (IR computed tomography, IR‐CT) in 3‐D and IR surface imaging, IR‐S) in 2‐D, at SOLEIL) combined with X‐ray nano‐computed tomography analyses (at SPring‐8) performed on eight small Ryugu fragments extracted from mm‐sized grains coming both from touchdown first and second sites. We describe the multiscale assembly of phyllosilicates, carbonates, sulfides, oxides, and organics. Two types of silicates, as well as diverse kinds of organic matter, were detected inside Ryugu material. Their spatial correlations are described to discuss the role of the mineralogical microenvironments in the formation/evolution of organic matter. In particular, we have shown that there is a redistribution of the organic matter diffuse component during aqueous alteration on the parent body, with a preferential circulation among fine‐grained phyllosilicates.

  18. Distributions of CHN compounds in meteorites record organic syntheses in the early solar system

    Yoshihiro Furukawa, Daisuke Saigusa, Kuniyuki Kano, Akira Uruno, Ritsumi Saito, Motoo Ito, Megumi Matsumoto, Junken Aoki, Masayuki Yamamoto, Tomoki Nakamura

    Scientific Reports　13　(1)　2023/04/24

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-023-33595-0 　

    eISSN： 2045-2322

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    Abstract Carbonaceous meteorites contain diverse soluble organic compounds. These compounds formed in the early solar system from volatiles accreted on tiny dust particles. However, the difference in the organic synthesis on respective dust particles in the early solar system remains unclear. We found micrometer-scale heterogeneous distributions of diverse CHN1-2 and CHN1-2O compounds in two primitive meteorites: the Murchison and NWA 801, using a surface-assisted laser desorption/ionization system connected to a high mass resolution mass spectrometer. These compounds contained mutual relationships of ± H2, ± CH2, ± H2O, and ± CH2O and showed highly similar distributions, indicating that they are the products of series reactions. The heterogeneity was caused by the micro-scale difference in the abundance of these compounds and the extent of the series reactions, indicating that these compounds formed on respective dust particles before asteroid accretion. The results of the present study provide evidence of heterogeneous volatile compositions and the extent of organic reactions among the dust particles that formed carbonaceous asteroids. The compositions of diverse small organic compounds associated with respective dust particles in meteorites are useful to understand different histories of volatile evolution in the early solar system.

  19. Nonequilibrium spherulitic magnetite in the Ryugu samples

    Elena Dobrică, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Adrian J. Brearley, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H.V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei ichiro Watanabe, Yuichi Tsuda

    Geochimica et Cosmochimica Acta　346　65-75　2023/04

    DOI： 10.1016/j.gca.2023.02.003 　

    ISSN： 0016-7037

  20. Re-distribution of volatiles on the airless surface of the C-type carbonaceous asteroid Ryugu.

    Toru Matsumoto, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Dennis Harries, Aki Takigawa, Yuusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope Ishii, John Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Pierre Beck, Thi Phan, Rolando Rebois, Neyda Abreu, Jennifer Gray, Thomas Zega, Pierre-Marie Zanetta, Michelle Thompson, Rhonda Stroud, Katherine Burgess, Brittany Cymes, John Bridges, Leon Hicks, Martin Lee, Luke Daly, Phil Bland, Michael Zolensky, David Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

    2023/03/16

    DOI： 10.21203/rs.3.rs-2389559/v1 　

  21. Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples

    Emmanuel Dartois, Yoko Kebukawa, Hikaru Yabuta, Jérémie Mathurin, Cécile Engrand, Jean Duprat, Laure Bejach, Alexandre Dazzi, Ariane Deniset-Besseau, Lydie BONAL, Eric Quirico, Christophe Sandt, Ferenc Borondics, Jens Barosch, George D. Cody, Bradley De Gregorio, MINAKO HASHIGUCHI, David A. L. Kilcoyne, Mutsumi Komatsu, Zita Martins, Megumi Matsumoto, Gilles Montagnac, Smail Mostefaoui, Larry R. Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Takaaki Noguchi, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hisayoshi Yurimoto, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa

    Astronomy & Astrophysics　671　2023/03

    DOI： 10.1051/0004-6361/202244702 　

    ISSN： 0004-6361 1432-0746

    eISSN： 1432-0746

  22. Mineralogical alteration of a type A <scp>CAI</scp> from Allende <scp>CV3</scp> chondrite: Formation of secondary dmisteinbergite and its phase transition to anorthite

    Yuma Enokido, Tomoki Nakamura, Megumi Matsumoto, Akira Miyake, Takazo Shibuya, Changkun Park, Mike Zolensky

    Meteoritics &amp; Planetary Science　58　(3)　405-420　2023/02/24

    Publisher: Wiley

    DOI： 10.1111/maps.13961 　

    ISSN： 1086-9379

    eISSN： 1945-5100

  23. Macromolecular organic matter in samples of the asteroid (162173) Ryugu

    Hikaru Yabuta, George D. Cody, Cécile Engrand, Yoko Kebukawa, Bradley De Gregorio, Lydie Bonal, Laurent Remusat, Rhonda Stroud, Eric Quirico, Larry Nittler, Minako Hashiguchi, Mutsumi Komatsu, Taiga Okumura, Jérémie Mathurin, Emmanuel Dartois, Jean Duprat, Yoshio Takahashi, Yasuo Takeichi, David Kilcoyne, Shohei Yamashita, Alexandre Dazzi, Ariane Deniset-Besseau, Scott Sandford, Zita Martins, Yusuke Tamenori, Takuji Ohigashi, Hiroki Suga, Daisuke Wakabayashi, Maximilien Verdier-Paoletti, Smail Mostefaoui, Gilles Montagnac, Jens Barosch, Kanami Kamide, Miho Shigenaka, Laure Bejach, Megumi Matsumoto, Yuma Enokido, Takaaki Noguchi, Hisayoshi Yurimoto, Tomoki Nakamura, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Harold C. Connolly, Dante S. Lauretta, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Kasumi Yogata, Aiko Nakato, Miwa Yoshitake, Ayako Iwamae, Shizuho Furuya, Kentaro Hatakeda, Akiko Miyazaki, Hiromichi Soejima, Yuya Hitomi, Kazuya Kumagai, Tomohiro Usui, Tasuku Hayashi, Daiki Yamamoto, Ryota Fukai, Seiji Sugita, Kohei Kitazato, Naru Hirata, Rie Honda, Tomokatsu Morota, Eri Tatsumi, Naoya Sakatani, Noriyuki Namiki, Koji Matsumoto, Rina Noguchi, Koji Wada, Hiroki Senshu, Kazunori Ogawa, Yasuhiro Yokota, Yoshiaki Ishihara, Yuri Shimaki, Manabu Yamada, Chikatoshi Honda, Tatsuhiro Michikami, Moe Matsuoka, Naoyuki Hirata, Masahiko Arakawa, Chisato Okamoto, Masateru Ishiguro, Ralf Jaumann, Jean-Pierre Bibring, Matthias Grott, Stefan Schröder, Katharina Otto, Cedric Pilorget, Nicole Schmitz, Jens Biele, Tra-Mi Ho, Aurélie Moussi-Soffys, Akira Miura, Hirotomo Noda, Tetsuya Yamada, Keisuke Yoshihara, Kosuke Kawahara, Hitoshi Ikeda, Yukio Yamamoto, Kei Shirai, Shota Kikuchi, Naoko Ogawa, Hiroshi Takeuchi, Go Ono, Yuya Mimasu, Kent Yoshikawa, Yuto Takei, Atsushi Fujii, Yu-ichi Iijima, Satoru Nakazawa, Satoshi Hosoda, Takahiro Iwata, Masahiko Hayakawa, Hirotaka Sawada, Hajime Yano, Ryudo Tsukizaki, Masanobu Ozaki, Fuyuto Terui, Satoshi Tanaka, Masaki Fujimoto, Makoto Yoshikawa, Takanao Saiki, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

    Science　379　(6634)　2023/02/24

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/science.abn9057 　

    ISSN： 0036-8075

    eISSN： 1095-9203

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    Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic features of the organic matter are consistent with those in chemically primitive carbonaceous chondrite meteorites that experienced parent-body aqueous alteration (reactions with liquid water). The morphology of the organic carbon includes nanoglobules and diffuse carbon associated with phyllosilicate and carbonate minerals. Deuterium and/or nitrogen-15 enrichments indicate that the organic matter formed in a cold molecular cloud or the presolar nebula. The diversity of the organic matter indicates variable levels of aqueous alteration on Ryugu’s parent body.

  24. Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples Peer-reviewed

    T. Nakamura, M. Matsumoto, K. Amano, Y. Enokido, M. E. Zolensky, T. Mikouchi, H. Genda, S. Tanaka, M. Y. Zolotov, K. Kurosawa, S. Wakita, R. Hyodo, H. Nagano, D. Nakashima, Y. Takahashi, Y. Fujioka, M. Kikuiri, E. Kagawa, M. Matsuoka, A. J. Brearley, A. Tsuchiyama, M. Uesugi, J. Matsuno, Y. Kimura, M. Sato, R. E. Milliken, E. Tatsumi, S. Sugita, T. Hiroi, K. Kitazato, D. Brownlee, D. J. Joswiak, M. Takahashi, K. Ninomiya, T. Takahashi, T. Osawa, K. Terada, F. E. Brenker, B. J. Tkalcec, L. Vincze, R. Brunetto, A. Aléon-Toppani, Q. H.S. Chan, M. Roskosz, J. C. Viennet, P. Beck, E. E. Alp, T. Michikami, Y. Nagaashi, T. Tsuji, Y. Ino, J. Martinez, J. Han, A. Dolocan, R. J. Bodnar, M. Tanaka, H. Yoshida, K. Sugiyama, A. J. King, K. Fukushi, H. Suga, S. Yamashita, T. Kawai, K. Inoue, A. Nakato, T. Noguchi, F. Vilas, A. R. Hendrix, C. Jaramillo-Correa, D. L. Domingue, G. Dominguez, Z. Gainsforth, C. Engrand, J. Duprat, S. S. Russell, E. Bonato, C. Ma, T. Kawamoto, T. Wada, S. Watanabe, R. Endo, S. Enju, L. Riu, S. Rubino, P. Tack, S. Takeshita, Y. Takeichi, A. Takeuchi, A. Takigawa, D. Takir, T. Tanigaki, A. Taniguchi, K. Tsukamoto, T. Yagi, S. Yamada, K. Yamamoto, Y. Yamashita, M. Yasutake, K. Uesugi, I. Umegaki

    Science (New York, N.Y.)　379　(6634)　eabn8671　2023/02/24

    DOI： 10.1126/science.abn8671 　

    ISSN： 0036-8075

    eISSN： 1095-9203

  25. Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy

    Stefano Rubino, Zélia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Tomoki Nakamura, Donia Baklouti, Zahia Djouadi, Cateline Lantz, Obadias Mivumbi, Ferenc Borondics, Stephane Lefrançois, Christophe Sandt, Francesco Capitani, Eva Héripré, David Troadec, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Seiichiro Watanabe, Yuichi Tsuda

    Earth, Planets and Space　75　(1)　2023/01/09

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01762-8 　

    eISSN： 1880-5981

    More details Close

    Abstract Sample-return missions allow the study of materials collected directly from celestial bodies, unbiased by atmospheric entry effects and/or terrestrial alteration and contamination phenomena, using state-of-the-art techniques which are available only in a laboratory environment—but only if the collected material stays pristine. The scarcity of outer-space unaltered material recovered until now makes this material extremely precious for the potential scientific insight it can bring. To maximize the scientific output of current and future sample-return missions, the scientific community needs to plan for ways of storing, handling, and measuring this precious material while preserving their pristine state for as long as the ‘invasiveness’ of measurements allows. In July 2021, as part of the Hayabusa2 (JAXA) “Stone” preliminary examination team, we received several microscopic particles from the asteroid Ryugu, with the goal of performing IR hyper-spectral imaging and IR micro-tomography studies. Here, we describe the sample transfer, handling methods and analytical pipeline we implemented to study this very precious material while minimizing and surveilling their alteration history on Earth. Graphical Abstract

  26. A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

    Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrica, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Pena, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre-M Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naru Hirata, Naoyuki Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kousuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Ryohta Fukai, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Suzuki, Tomohiro Usui, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Harold C. Connolly, Dante S. Lauretta, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

    NATURE ASTRONOMY　2022/12

    DOI： 10.1038/s41550-022-01841-6 　

    ISSN： 2397-3366

  27. Trace-element analysis of mineral grains in Ryugu rock fragment sections by synchrotron-based confocal X-ray fluorescence Peer-reviewed

    Benjamin Bazi, Pieter Tack, Miles Lindner, Bart Vekemans, Ella De Pauw, Beverley Tkalcec, Frank E. Brenker, Jan Garrevoet, Gerald Falkenberg, Hikaru Yabuta, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Masayuki Uesugi, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

    Earth, Planets and Space　74　(1)　2022/11/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-022-01726-y 　

    ISSN： 1343-8832

    eISSN： 1880-5981

  28. Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission Peer-reviewed

    Pieter Tack, Ella De Pauw, Beverley Tkalcec, Miles Lindner, Benjamin Bazi, Bart Vekemans, Frank Brenker, Marco Di Michiel, Masayuki Uesugi, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-Ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

    Earth, Planets and Space　74　(1)　2022/09/28

    DOI： 10.1186/s40623-022-01705-3 　

    eISSN： 1880-5981

  29. Three-dimensional microstructure and mineralogy of a cosmic symplectite in the Acfer 094 carbonaceous chondrite: Implication for its origin Peer-reviewed

    Megumi Matsumoto, Akira Tsuchiyama, Akira Miyake, Motoo Ito, Junya Matsuno, Kentaro Uesugi, Akihisa Takeuchi, Yu Kodama, Masahiro Yasutake, Epifanio Vaccaro

    Geochimica et Cosmochimica Acta　323　220-241　2022/04

    DOI： 10.1016/j.gca.2022.02.024 　

    ISSN： 0016-7037

    eISSN： 1872-9533

  30. Anaerobic Microscopic Analysis of Ferrous Saponite and Its Sensitivity to Oxidation by Earth’s Air: Lessons Learned for Analysis of Returned Samples from Mars and Carbonaceous Asteroids Peer-reviewed

    Natsumi Noda, Shohei Yamashita, Yoshio Takahashi, Megumi Matsumoto, Yuma Enokido, Kana Amano, Takahiro Kawai, Hiroshi Sakuma, Keisuke Fukushi, Yasuhito Sekine, Tomoki Nakamura

    Minerals　11　(11)　1244-1244　2021/11/09

    Publisher: MDPI AG

    DOI： 10.3390/min11111244 　

    eISSN： 2075-163X

  31. Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials Peer-reviewed

    Tomoya Obase, Daisuke Nakashima, Jisu Choi, Yuma Enokido, Megumi Matsumoto, Tomoki Nakamura

    Geochimica et Cosmochimica Acta　312　75-105　2021/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.gca.2021.08.012 　

    ISSN： 0016-7037

  32. In-situ FE-SEM observation of the growth behaviors of Fe particles at magmatic temperatures Peer-reviewed

    Mayumi Mujin, Michihiko Nakamura, Megumi Matsumoto

    Journal of Crystal Growth　560-561　126043-126043　2021/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jcrysgro.2021.126043 　

    ISSN： 0022-0248

  33. In-situ water-immersion experiments on amorphous silicates in the MgO–SiO2 system: implications for the onset of aqueous alteration in primitive meteorites Peer-reviewed

    Yohei Igami, Akira Tsuchiyama, Tomoya Yamazaki, Megumi Matsumoto, Yuki Kimura

    Geochimica et Cosmochimica Acta　293　86-102　2021/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.gca.2020.10.023 　

    ISSN： 0016-7037

  34. Nanosized Authigenic Magnetite and Hematite Particles in Mature‐Paleosol Phyllosilicates: New Evidence for a Magnetic Enhancement Mechanism in Loess Sequences of China Peer-reviewed

    Masayuki Hyodo, Takuroh Sano, Megumi Matsumoto, Yusuke Seto, Balázs Bradák, Kota Suzuki, Jun‐ichi Fukuda, Meinan Shi, Tianshui Yang

    Journal of Geophysical Research: Solid Earth　125　(3)　2020/03

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2019jb018705 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  35. Discovery of fossil asteroidal ice in primitive meteorite Acfer 094. International-journal Peer-reviewed

    Megumi Matsumoto, Akira Tsuchiyama, Aiko Nakato, Junya Matsuno, Akira Miyake, Akimasa Kataoka, Motoo Ito, Naotaka Tomioka, Yu Kodama, Kentaro Uesugi, Akihisa Takeuchi, Tsukasa Nakano, Epifanio Vaccaro

    Science advances　5　(11)　eaax5078　2019/11

    DOI： 10.1126/sciadv.aax5078 　

    More details Close

    Carbonaceous chondrites are meteorites believed to preserve our planet's source materials, but the precise nature of these materials still remains uncertain. To uncover pristine planetary materials, we performed synchrotron radiation-based x-ray computed nanotomography of a primitive carbonaceous chondrite, Acfer 094, and found ultraporous lithology (UPL) widely distributed in a fine-grained matrix. UPLs are porous aggregates of amorphous and crystalline silicates, Fe─Ni sulfides, and organics. The porous texture must have been formed by removal of ice previously filling pore spaces, suggesting that UPLs represent fossils of primordial ice. The ice-bearing UPLs formed through sintering of fluffy icy dust aggregates around the H2O snow line in the solar nebula and were incorporated into the Acfer 094 parent body, providing new insight into asteroid formation by dust agglomeration.

  36. Microstructure and Magnetic Properties of Cu-Ag-La-Fe Immiscible Alloys with an Amorphous Phase Peer-reviewed

    Takeshi Nagase, T. Terai, T. Kakeshita, Megumi Matsumoto, Yoshikazu Fujii

    Materials Transactions　60　(4)　554-560　2019/01

    Publisher: J-STAGE

    DOI： 10.2320/matertrans.Y-M2019803 　

  37. Microstructure of Ti-Ag immiscible alloys with liquid phase separation Peer-reviewed

    Takeshi Nagase, Megumi Matsumoto, Yoshikazu Fujii

    Journal of Alloys and Compounds　738　440-447　2018/03/25

    Publisher: Elsevier Ltd

    DOI： 10.1016/j.jallcom.2017.12.138 　

    ISSN： 0925-8388

  38. 3D microstructure of a presolar silicate in the Acfer 094 meteorite

    Matsumoto Megumi, Matsuno Junya, Miyake Akira, Nakato Aiko, Tsuchiyama Akira, Ito Motoo, Tomioka Naotaka, Kodama Yu, Vaccaro Epifanio

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2018　132　2018

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jakoka.2018.0_132 　

    More details Close

    Primitive meteorites contain little amounts of presolar grains which formed in circumstellar environments before the Solar System formation. Detailed observations of these grains are important in understanding formation processes of solid materials in space. In this study, we performed TEM analyses and STEM-EDS tomography on one presolar silicate grain found in Acfer 094 meteorite to understand its formation history.

  39. Discovery of moganite in a lunar meteorite as a trace of H2O ice in the Moon’s regolith Peer-reviewed

    Kayama M, Tomioka N, Ohtani E, Seto Y, Nagaoka H, Götze J, Miyake A, Ozawa S, Sekine T, Miyahara M, Tomeoka K, Matsumoto M, Shoda N, Hirano N, Kobayashi T

    Science Advances　4　(5)　eaar4378　2018

    DOI： 10.1126/sciadv.aar4378 　

    ISSN： 2375-2548

  40. Microstructure and magnetic properties of Cu-Ag-La-Fe immiscible alloys with an amorphous phase Peer-reviewed

    Nagase T, Terai T, Kakeshita T, Matsumoto M, Fujii Y

    Journal of the Japan Society of Powder and Powder Metallurgy　65　(1)　1-7　2018

    DOI： 10.2497/jjspm.65.45 　

  41. Nepheline and sodalite in chondrules of the Ningqiang carbonaceous chondrite: Implications for a genetic relationship with those in the matrix Peer-reviewed

    Megumi Matsumoto, Kazushige Tomeoka, Yusuke Seto

    GEOCHIMICA ET COSMOCHIMICA ACTA　208　220-233　2017/07

    DOI： 10.1016/j.gca.2017.03.032 　

    ISSN： 0016-7037

    eISSN： 1872-9533

  42. Minimizing and quantifying mis-indexing in electron backscatter diffraction (EBSD) determinations of antigorite crystal directions Peer-reviewed

    Takayoshi Nagaya, Simon R. Wallis, Yusuke Seto, Akira Miyake, Yusuke Soda, Seiichiro Uehara, Megumi Matsumoto

    JOURNAL OF STRUCTURAL GEOLOGY　95　127-141　2017/02

    DOI： 10.1016/j.jsg.2016.12.006 　

    ISSN： 0191-8141

  43. Design and microstructure analysis of globules in Al-Co-La-Pb immiscible alloys with an amorphous phase Peer-reviewed

    Nagase Takeshi, Takemura Mamoru, Matsumuro Mitsuaki, Matsumoto Megumi, Fujii Yoshikazu

    Materials & Design　117　338-345　2017/01

    DOI： 10.1016/j.matdes.2016.12.092 　

  44. Coherent interface structures and intergrain Josephson coupling in dense MgO/Mg2Si/MgB2 nanocomposites Peer-reviewed

    Katsuya Ueno, Yukihito Nagashima, Yusuke Seto, Megumi Matsumoto, Takahiro Sakurai, Hitoshi Ohta, Kazuyuki Takahashi, Takashi Uchino

    JOURNAL OF APPLIED PHYSICS　120　(1)　015102-1-015102-10　2016/07

    DOI： 10.1063/1.4954875 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  45. HYDRATED, UNMETAMORPHOSED CLASTS IN THE NWA 1232 CO3 CARBONACEOUS CHONDRITE.

    M. Matsumoto, K. Tomeoka, Y. Seto, A. Miyake, M. Kiriishi, M. Umehara, Y. Yamamoto, D. Nishio-Hamane

    METEORITICS & PLANETARY SCIENCE　50　5058　2015/08

    ISSN： 1086-9379

    eISSN： 1945-5100

  46. Reply to comment by Nozaka (2014) on "Dehydration breakdown of antigorite and the formation of B-type olivine CPO" Peer-reviewed

    Takayoshi Nagaya, Simon R. Wallis, Hiroaki Kobayashi, Katsuyoshi Michibayashi, Tomoyuki Mizukami, Yusuke Seto, Akira Miyake, Megumi Matsumoto

    EARTH AND PLANETARY SCIENCE LETTERS　408　406-407　2014/12

    DOI： 10.1016/j.epsl.2014.10.026 　

    ISSN： 0012-821X

    eISSN： 1385-013X

  47. Dehydration breakdown of antigorite and the formation of B-type olivine CPO Peer-reviewed

    Takayoshi Nagaya, Simon R. Wallis, Hiroaki Kobayashi, Katsuyoshi Michibayashi, Tomoyuki Mizukami, Yusuke Seto, Akira Miyake, Megumi Matsumoto

    EARTH AND PLANETARY SCIENCE LETTERS　387　67-76　2014/02

    DOI： 10.1016/j.epsl.2013.11.025 　

    ISSN： 0012-821X

    eISSN： 1385-013X

  48. Nepheline and sodalite in the matrix of the Ningqiang carbonaceous chondrite: Implications for formation through parent-body processes Peer-reviewed

    Megumi Matsumoto, Kazushige Tomeoka, Yusuke Seto, Akira Miyake, Mitsuhiro Sugita

    GEOCHIMICA ET COSMOCHIMICA ACTA　126　441-454　2014/02

    DOI： 10.1016/j.gca.2013.11.016 　

    ISSN： 0016-7037

    eISSN： 1872-9533

  49. Na metasomatism in the Ningqiang carbonaceous chondrite : A TEM and SR-XRD study

    MATSUMOTO Megumi, TOMEOKA Kazushige, SETO Yusuke, SUGITA Mitsuhiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2011　259-259　2011/09/05

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jakoka.2011.0.254.0 　

    ISSN： 1348-6543

    More details Close

    CAIs in the Ningqiang carbonaceous chondrite are known to have experienced extensive Na metasomatism and contain various amounts of nepheline. Here we present the results of a detailed mineralogical study of chondrules and matrix in the Ningqiang chondrite. We found that most chondrules contain various amounts of nepheline, formed by replacing plagioclase in the mesostasis. Nepheline is also uniformly distributed as small grains in the matrix. These results indicate that nepheline is common in all over the meteorite and suggest that Na metasomatism was probably an extensive process that involved all of the major components in the Ningqiang parent body.

Show all ︎Show first 5

Misc. 20

  1. はやぶさ2リターンサンプルの放射光分析が解き明かした小惑星リュウグウの形成史—Asteroid Ryugu's history recorded in Hayabusa 2 returned samples

    松本 恵, 土山 明, 松野 淳也, 上椙 真之, 安武 正展, 上杉 健太朗, 竹内 晃久

    放射光 : 日本放射光学会誌 = Journal of the Japanese Society for Synchrotron Radiation Research / 日本放射光学会 編　37　(4)　238-252　2024/07

    Publisher: 大阪 : 日本放射光学会

    ISSN： 0914-9287

  2. Observation of internal structure of diamond in carbon grains in DaG 999 ureilite.

    安武正展, 松本恵, 松野淳也, 土山明, 土山明, 上杉健太朗, 竹内晃久

    日本鉱物科学会年会講演要旨(Web)　2023　2023

  3. Nano-CT and TEM analysis of impact melt splashes and microcraters on asteroid Ryugu samples

    松本恵, 松野淳也, 土山明, 土山明, 中村智樹, 榎戸祐馬, 菊入瑞葉, 安武正展, 上杉建太朗, 竹内晃久, 延寿里美, 奥村翔太, 三津川到, MINGQI Sun, 三宅亮

    日本鉱物科学会年会講演要旨(Web)　2023　2023

  4. P6 高分解能 X線 CTを用いた蛇紋石結晶の三次元観察

    延寿里美, 松野淳也, 安武正展, 松本恵, 土山明, 上杉健太朗, 竹内晃久

    粘土科学討論会講演要旨集(Web)　65　2022

    ISSN： 2433-0582

  5. Microtextures of serpentine veins by high resolution X-ray CT

    延寿里美, 松野淳也, 安武正展, 松本恵, 土山明, 土山明, 上杉健太朗, 竹内晃久

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  6. Melt inclusions containing platinum group minerals in Tahitian mantle xenolith

    三津川到, 小木曽哲, 秋澤紀克, 田口知樹, 上杉健太朗, 竹内晃久, 安武正展, 土山明, 土山明, 松本恵, 松野淳也, 奥村翔太, 伊神洋平, 三宅亮

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  7. Investigation of carbonaceous material in ureilite by using SIXM

    安武正展, 松野淳也, 松本恵, 土山明, 土山明, 上杉健太朗, 竹内晃久

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  8. Mineralogical investigation of multiple lithologies in the Hayabusa2 returned sample C0002 grain using SEM, TEM, and X-ray nanoCT

    松本恵, 松野淳也, 土山明, 土山明, 中村智樹, 三河内岳, 安武正展, 上杉健太朗, 竹内晃久, 延寿里美, 奥村翔太, 三津川到, MINGQI S., 榎戸祐馬, 三宅亮, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  9. A nugget of platinum group element sulfides found from a Ryugu sample

    松野淳也, 三宅亮, 松本恵, 中村智樹, 高橋嘉夫, 山田真也, 土山明, 延寿里美, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  10. Magnetite 3D morphology in Hayabusa2 returned sample: diversity and implication

    土山明, 土山明, 松本恵, 松野淳也, 三宅亮, 中村智樹, 野口高明, 安武正展, 上杉健太朗, 竹内晃久, 延寿里美, 瀧川晶, 奥村翔太, 三津川到, MINGQI S., 榎戸祐馬, 松本徹, 圦本尚義, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

    日本鉱物科学会年会講演要旨(Web)　2022　2022

  11. High-resolution imaging mass spectrometry of CHN compounds in meteorites: organic synthesis in the early solar system

    Furukawa Yoshihiro, Saigusa Daisuke, Kano Kuniyuki, Uruno Akira, Saito Ritsumi, Ito Motoo, Matsumoto Megumi, Aoki Jyunken, Yamamoto Masayuki, Nakamura Tomoki

    Abstracts of Annual Meeting of the Geochemical Society of Japan　69　190　2022

    Publisher: GEOCHEMICAL SOCIETY OF JAPAN

    DOI： 10.14862/geochemproc.69.0_190 　

  12. 放射光CTで得られるリュウグウ試料の3次元構造

    上椙真之, 伊藤元雄, 松本恵, 土山明, 中村智樹, 平原佳織, 富岡尚敬, 上杉健太郎, 山口亮, 今栄直也, 白井直樹, 大東琢治, 木村眞, LIU Ming-Chang, GREENWOOD Richard, 中藤亜衣子, 与賀田佳澄, 竹内晃久, 安武正展, 湯沢勇人, 兒玉優, 櫻井郁也, 岡田育夫, 唐牛譲, 渡邉誠一郎, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)　2022　2022

  13. Development of analytical nanotomography using synchrotron radiation and its application to Hayabusa2 sample analysis.

    土山明, 土山明, 松野淳也, 三宅亮, 松本恵, 中村智樹, 野口高明, 上杉健太朗, 竹内晃久, 安武正展

    Optics & Photonics Japan講演予稿集(CD-ROM)　2021　2021

  14. High spatial resolution three-color CT imaging of CM and CI meteorites and their heated samples for a rehearsal analysis of Ryugu

    松野淳也, 土山明, 松本恵, 藤岡悠理, 中村智樹, 上杉健太朗, 竹内晃久, 安武正展, 中野司, 中野直人, STEFANO Rubino, 奥村翔太, 三宅亮

    日本地球惑星科学連合大会予稿集(Web)　2021　2021

  15. Synchrotron radiation-based X-ray computed nanotomography of unheated and experimentally heated Murchison carbonaceous chondrite

    松本恵, 土山明, 土山明, 安武正展, 三宅亮, 上杉健太朗, 竹内晃久, 中野司, 中村智樹

    日本鉱物科学会年会講演要旨(Web)　2020　2020

  16. TEM observations of a cosmic symplectite in the Acfer 094 meteorite

    松本恵, 土山明, 土山明, 三宅亮, 富岡尚敬, 伊藤元雄, 兒玉優, 松野淳也, 安武正展, 中藤亜衣子, 上杉健太朗, 竹内晃久, 中野司, VACCARO E.

    日本鉱物科学会年会講演要旨(Web)　2019　2019

  17. TEM observations of pedogenic nanoparticles causing magnetic enhancement in Chinese loess deposits

    Matsumoto Megumi, Seto Yusuke, Sano Takuroh, Suzuki Kouta, Hyodo Masayuki, Miyake Akira, Nishio-Hamane Daisuke, Sakaiya Tatsuhiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2016　124　2016

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jakoka.2016.0_124 　

    ISSN： 1348-6543

    More details Close

    Magnetic enhancement in Chinese loess is thought to be caused by formations of magnetic grains during pedogenesis. However, there is no mineralogical study confirming it. Here we show the results of XRD and SEM/TEM study of magnetic grains in Chinese loess. Magnetic grains (hematite and magnetite) exist mainly as nano inclusions in muscovite and occupy < 1% of the total loess volume. The magnetic grains were probably formed in situ during pedogenesis and responsible for the magnetic enhancement.

  18. NWA1232 CO3隕石中の微小クラストの集合からなる岩相

    松本恵, 留岡和重, 瀬戸雄介, 桐石美帆, 梅原まり子, 山本由紀子, 三宅亮, 浜根大輔

    日本鉱物科学会年会講演要旨集　2014　2014

    ISSN： 1348-6543

  19. O7-02 CV,CO隕石中のネフェリン・ソーダライトの形成過程と水質変成作用の関係(口頭発表セッション7(隕石),口頭発表)

    松本 恵, 留岡 和重, 瀬戸 雄介, 三宅 亮

    日本惑星科学会秋期講演会予稿集　2012　60-60　2012/10/24

    Publisher: 日本惑星科学会

  20. Na-metasomatism in the Ningqiang and Warrenton (CO) chondrites : relation to aqueous alteration

    MATSUMOTO Megumi, TOMEOKA Kazushige, SETO Yusuke, MIYAKE Akira

    2012　181-181　2012/09/15

    ISSN： 1348-6543

Show all ︎Show first 5

Presentations 55

  1. Mineralogical, Petrological, and Physical Properties of Ryugu Samples Using X-Ray Nanotomography

    Tsuchiyama A Matsumoto, M, Matsuno, J, Nakamura T, Noguchi T

    53rd Lunar and Planetary Science Conference　2022/03/09

  2. Mineralogical Analysis of Various Lithologies in Coarse Ryugu Samples Using Transmission Electron Microscopy

    Matsumoto M, Matsuno, J, Tsuchiyama A Nakamura, T, Enokido Y

    53rd Lunar and Planetary Science Conference　2022/03/09

  3. EARLY HISTORY OF RYUGU’S PARENT ASTEROID: EVIDENCE FROM RETURN SAMPLE.

    Nakamura T, Matsumoto M, Amano K, Enokido Y, Zolensky M, E

    53rd Lunar and Planetary Science Conference　2022/03/07

  4. 隕石中の氷の痕跡とその母天体進化 Invited

    松本恵, 土`山明, 中藤亜衣子, 松野淳也, 三宅亮, 片岡章雅, 伊藤元雄, 富岡尚敬, 兒玉優, 上杉健太朗, 竹内晃久, 中野司, バッカロ エピファニオ

    天体の衝突物理の解明 (XVII) ～小天体進化における圧密過程の役割～（衝突研究会）　2021/11/25

  5. X-ray nanotomography of CM and CI chondrites and their heated samples: as a rehearsal of Hayabusa2 sample analysis.

    M. Sun, A. Tsuchiyama, M. Matsumoto, Y. Fujioka, T. Nakamura, J. Matsuno, A. Miyake, S. Okumura, N. Tomioka, M. Ito, Y. Kodama, S. Rubino, N. Nakano, K. Uesugi, A. Takeuchi, M. Yasutake

    JpGU meeting 2021

  6. Combined XRD-XCT-FIB-TEM analysis of experimentally heated Murchison CM chondrite

    M. Matsumoto, J. Matsuno, A. Tsuchiyama, Y. Fujioka, T. Nakamura, A. Miyake, M. Yasutake, S. Okumura, K. Uesugi, A. Takeuchi

    JpGU meeting 2021

  7. Formation process of a multi-layered chondrule rim and a relationship of fine-grained rim and matrix in two LL chondrites

    橋本幸菜, 中村智樹, 松本恵

    JpGU meeting 2021

  8. 非加熱・実験加熱Murchison隕石の放射光X線CT

    松本恵, 土`山明, 安武正展, 三宅亮, 上杉健太朗, 竹内晃久, 中野司, 中村智樹

    日本鉱物科学会2020年年会　2020/09

  9. In-situ observation for aqueous alteration process of amorphous silicate particles in the MgO–SiO2 system

    Yohei IGAMI, Akira TSUCHIYAMA, Tomoya YAMAZAKI, Yuki KIMURA, Megumi MATSUMOTO

    2020/09

  10. Heating effects on the structures and elemental ratios of IOM in Jbilet Winselwan and Y 793321 CM chondrites

    Ryota Ichimura, Yoshihiro Furukawa, Tomoki Nakamura, Megumi Matsumoto

    2020/07

  11. Time-dependent spectroscopic and mineralogical changes by heating of Murray CM chondrite

    Y. Fujioka, T. Nakamura, M. Matsumoto, K. Amano, S. Kobayashi, A. Takigawa

    2020/07

  12. Formation process of a unique hydrous micrometeorite with abundant Fe-rich saponite and Fe sulfide

    S. Shimizu, S. Kikuchi, T. Nakamura, M. Matusmoto, T. Shibuya, C. Engrand, J. Duprat

    2020/07

  13. Synchrotron radiation-based X-ray computed nanotomography of unheated and experimentally heated Murchison CM chondrite

    2020/07

  14. THREE DIMENSIONAL MICROSTRUCTURE AND MINERALOGY OF A COSMIC SYMPLECTITE IN THE ACFER 094 CARBONACEOUS CHONDRITE

    2020/03

  15. In-situ observation of growth behaviors of Fe and Pt particles in a silicate melt

    Mujin M, Nakamura M, Matsumoto M

    2019 Annual Meeting of Japan Association of Mineralogical Sciences　2019/09/20

  16. TEM observations of a cosmic symplectite in the Acfer 094 meteorite

    Matsumoto M, Tsuchiyama A, Miyake A, Tomioka N, Ito M, Kodama Y, Matsuno J, Yasutake M, Nakato A, Uesugi K, Takeuchi A, Nakano T, Vaccaro E

    2019 Annual Meeting of Japan Association of Mineralogical sciences　2019/09/20

  17. Experimental heating of a hydrated carbonaceous chondrite to simulate solar radiation heating of 3200 Phaethon International-presentation

    Kobayashi S, Nakamura T, Amano K, Matsumoto M

    The 82nd Annual Meeting of the Meteoritical Society　2019/07/07

  18. Formation processes of secondary dmisteinbergite and anorthite in Allende CAI International-presentation

    Enokido Y, Nakamura T, Matsumto M, Miyake A

    The 82nd Annual Meeting of the Meteoritical Society　2019/07/07

  19. Multi-layered fine-grained rim around chondrules in the Y-75273 LL3 chondrite: Nebular and parent-body processes International-presentation

    Hashimoto Y, Nakamura T, Matsumoto M

    The 82nd Annual Meeting of the Meteoritical Society　2019/07/07

  20. Experimental reproduction of space weathering of C-type asteroids by He exposure to shocked and partially dehydrated carbonaceous chondrites International-presentation

    Nakamura T, Lantz C, Kobayashi S, Nakauchi Y, Amano K, Brunetto R, Matsumoto M, Takahashi M, Matsuoka M, Noguchi T, Matsumoto T, Miyake A, Tsuchiyama A, Zolensky M. E

    The 82nd Annual Meeting of the Meteoritical Society　2019/07/07

  21. Ultra porous lithology, a fossil asteroidal ice, in carbonaceous chondrite Acfer 094: Implications for parent body formation by icy dust agglomeration International-presentation

    Matsumoto M, Tsuchiyama A, Nakato A, Matsuno J, Miyake A, Kataoka A, Ito M, Tomioka N, Kodama Y, Uesugi K, Takeuchi A, Nakano T, Vaccaro E

    The 82nd Annual Meeting of the Meteoritical Society　2019/07/07

  22. Numerous nano-sized magnetite and hematite inclusions in muscovite in loess

    Hyodo M, Sano T, Matsumoto M, Seto Y, Suzuki K, Yang T

    JpGU 2019　2019/05/26

  23. 3D microstructure of a cosmic symplectite in primitive carbonaceous chondrite Acfer 094

    Matsumoto M, Tsuchiyama A, Matsuno J, Nakato A, Miyake A, Ito M, Tomioka N, Kodama Y, Uesugi K, Takeuchi A, Nakano T, Vaccaro E

    JpGU 2019　2019/05/26

  24. Three-dimensional microstructure of a presolar silicate in the Acfer 094 carbonaceous chondrite International-presentation

    Matsumoto M, Matsuno J, Miyake A, Nakato A, Tsuchiyama A, Ito M, Tomioka N, Kodama Y, Vaccaro E

    The Ninth Symposium on Polar Science　2018/12/04

  25. 3D microstructure of a presolar silicate in the Acfer 094 meteorite

    Matsumoto M, Matsuno J, Miyake A, Nakato A, Tsuchiyama A, Ito M, Tomioka N, KodamaY, Vaccaro E

    JAMS conference 2018　2018/09

  26. An ultra porous lithology in the primitive carbonaceous chondrite Acfer 094: Investigation for pristine planetary materials International-presentation

    Matsumoto M, Tshuchiyama A, Matsuno J, Nakato A, Miyake A, Ito M, Tomioka N, Kodama Y, Uesugi K, Takeushi A, Nakano T, Vaccaro E

    MetSoc 2018　2018/07

  27. Microstructure of a matrix in primitive carbonaceous chondrite Acfer 094: investigation for pristine planetary materials

    Matsumoto M, Tsuchiyama A, Matsuno J, Miyake A, Nakato A, Ito M, Tomioka N, KodamaY, Uesugi K, Takeuchi A, Nakano T, Vaccaro E

    JpGU 2018　2018/05

  28. 始原的炭素質コンドライトMIL090657マトリクスにおける水質変成度の異なる岩相のTEMによる微細組織観察

    Sugimoto M, Tsuchiyama A, Matsumoto M, Igami Y, Miyake A

    日本惑星科学会2017年秋季講演会　2017/09

  29. Ivuna隕石(CI)に見られる複数の岩相中のマトリクスの3次元構造の研究

    Kitayama A, Tsuchiyama A, Miyake A, Nakano T, Takeuchi A, Uesugi K, Matsumoto M, Matsuno J, Ito S

    日本惑星科学会2017年秋季講演会　2017/09

  30. Microstructure of a very porous lithology in the Acfer 094 meteorite

    Matsumoto M, Nakato A, Tsuchiyama A, Matsuno J, Miyake A, Uesugi K, Takeushi A, Nakano T, Vaccaro E

    JAMS conference 2017　2017/09

  31. A very porous lithology of the Acfer 094 meteorite

    Tsuchiyama A, Nakato A, Matsuno J, Miyake A, Matsumoto M, Uesugi K, Takeushi A, Nakano T, Vaccaro E, Russell S

    Goldschmidt 2017　2017/08

  32. TEM observations of pedogenic nanoparticles causing magnetic enhancement in Chinese loess deposits

    Matsumoto M, Seto Y, Sano T, Hyodo M, Miyake A

    The 74th Annual Meeting of the Japanese Scociety of Microscopy　2017/06

  33. 3D structure of primitive carbonaceous chondrite Acfer 094: investigation of amorphous silicates

    Nakato A, Tsuchiyama A, Matsumoto M, Matsuno J, Miyake A, Uesugi K, Takeuchi A, Nakano T, Vaccaro E, Russell S

    JpGU 2017　2017/05

  34. Influence of the miss-indexing in SEM-EBSD measurements on antigorite CPO patterns

    Nagaya T, Simon R. W, Seto Y, Miyake A, Soda Y, Uehara S, Matsumoto M

    JAMS conference 2016　2016/09

  35. Semi-automatically indexing of complex electron diffraction pattern

    Seto Y, Matsumoto M

    JAMS conference 2016　2016/09

  36. TEM observations of pedogenic nanoparticles causing magnetic enhancement in Chinese loess deposits

    Matsumoto M, Seto Y, Sano T, Suzuki K, Hyodo M, MIyake A, Nishio-Hamane D, Sakaiya T

    JAMS conference 2016　2016/09

  37. Origin of water and water reservoirs on the Moon as considered from the perspective of material science.

    Kayama M, Tomioka N, Ohtani E, Nakashima S, Seto Y, Nagaoka H, Fagan T. J, Götze J, Miyake A, Ozawa S, Sekine T, Miyahara M, Matsumoto M, Shoda N, Tomeoka

    JpGU 2016　2016/05

  38. Water-rich lunar upper mantle as recorded in lunar meteorites.

    Kayama M, Nakashima S, Tomioka N, Seto Y, Ohtani E, Fagan T. J, Nagaoka H, Ozawa S, Sekine T, Miyahara M, Miyake A, Fukuda J, Tomeoka K, Ichimura S, Matsumoto M, Suzuki K, Götze J

    JpGU 2016　2016/05

  39. Microscopic observations of pedogenic nanoparticles causing enhancement in Chinese loess deposits

    Sano T, Hyodo M, Matsumoto M, Seto Y, Yang T

    JpGU 2016　2016/05

  40. Mineralogy of CO3.0-like clasts in the NWA 1232 CO3 breccia: Evidence for aqueous alteration on the parent body

    Matsumoto M, Tomeoka K, Seto Y, Miyake A

    JpGU 2016　2016/05

  41. Micro IR/Raman observations of PM2.5 sampled in Osaka International-presentation

    Tomizawa R, Maruyama D, Nakashima S, Suzuki M, Ohnishi I, Seto Y, Matsumoto M, Nishimura R, Fukuyama Y

    Annual Meeting/ International Symposium of the Spectroscopical Society of Japan 2016　2016

  42. Observations of PM2.5 Sampled in Osaka with SEM/TEM-EDS, IR Spectroscopy and Raman Spectroscopy International-presentation

    Tomizawa R, Maruyama D, Nakashima S, Harui R, Suzuki M, Ohnishi I, Seto Y, Matsumoto M, Nishimura R, Fukuyama Y

    Goldschmidt 2016　2016

  43. Microstructure of Al-Co-La-Pb immiscible alloys with an amorphous phase International-presentation

    Nagase T, Takemura M, Matsumuro M, Matsumoto M, Fujii Y

    The 9 th Pacific Rim International Conference on Advanced Materials and Processing.　2016

  44. Hydrated, unmetamorphosed clasts in the NWA 1232 CO3 carbonaceous chondrite International-presentation

    Matsumoto M, Tomeoka K, Seto Y, Miyake A, Kiriishi M, Umehara M, Yamamoto Y, Nishio-Hamane D

    MetSoc 2015　2015/08

  45. Aqueously altered clasts in the NWA 1232 CO3 carbonaceous chondrite

    Matsumoto M, Tomeoka K, Seto Y, Miyake A, Kiriishi M, Umehara M, Yamamoto Y, Nishio-Hamane D

    JpGU 2015　2015/05

  46. Alloy design and microstructure of Al-Co-La-Pb immiscible alloys.

    Nagase T, Takemura M, Matsumuro M, Matsumoto M, Fujii Y

    The 131st Conference of Japan Institute of Light Material　2015

  47. Developments of methods for micro- and nano-analyses of atmospheric particles (PM2.5) and tracing their formation processes.

    Nakashima S, Maruyama T, Tomizawa R, Okada M, Suzuki M, Ohnishi I, Seto Y, Matsumoto M, Nishimura R, Fukuyama Y

    56th Meeting of the Japan Society for Atmospheric Environment.　2015

  48. SEM/TEM-EDS analyses of atmospheric particles (PM2.5) at Osaka

    Maruyama T, Tomizawa R, Nakashima S, Suzuki M, Ohnishi I, Seto Y, Matsumoto M, Nishimura R, Hukuyama Y

    56th Meeting of the Japan Society for Atmospheric Environment　2015

  49. Hydrothermal alteration experiments of the Allende meteorite under reducing conditions.

    Iikuni T, Tomeoka K, Seto Y, Ichimura S, Matsumoto M

    日本鉱物科学会2014年年会　2014/09

  50. A unique lithology consisting of small clasts of different metamorphic grades in the NWA 1232 CO3 chondrite

    Matsumoto M, Tomeoka K, Seto Y, Kiriishi M, Umehara M, Yamamoto Y, Miyake A, Nishio-Hamane D

    JAMS conference 2014　2014/09

  51. A unique lithology in the NWA 1232 CO3 chondrite containing clasts of different metamorphic grades

    Matsumoto M, Tomeoka K, Seto Y, Yamamoto Y, Umehara M, Miyake A, Nishio-Hamane D

    JpGU 2014　2014/05

  52. Sodium metasomatism of chondrules and Ca-Al-rich inclusions in the Ningqiang carbonaceous chondrite.

    Matsumoto M, Tomeoka K, Seto Y, Miyake A, Nishio-Hamane D

    JAMS conference 2013　2013/09

  53. Na-metasomatism in the Ningqiang and Warrenton (CO) chondrites: relation to aqueous alteration

    Matsumoto M, Tomeoka K, Seto Y, Miyake A

    JAMS conference 2012　2012/09

  54. Na-metasomatism in the Ningqiang carbonaceous chondrite: A TEM and SR-XRD study

    Matsumoto M, Seto Y, Miyake A, Tomeoka K

    JpGU 2012　2012/05

  55. Na-metasomatism in the Ningqiang carbonaceous chondrite: A TEM and SR-XRD study.

    Matsumoto M, Tomeoka K, Seto Y, Sugita M

    JAMS conference 2011　2011/09

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Research Projects 5

  1. The Chemical Environment of the Solar System during its Formation

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A)

    Category: Grant-in-Aid for Transformative Research Areas (A)

    Institution: The University of Tokyo

    2020/11 - 2025/03

  2. Construction of an unifying model of formation and evolution of primordial material in the solar system

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Ritsumeikan University

    2020/04 - 2025/03

  3. Insight into evolution of solid materials in the early solar system based on in-situ heating experiments on amorphous silicates in primitive solar materials

    Megumi Matsumoto

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2019/04 - 2022/03

    More details Close

    This study revealed detailed characteristics of amorphous silicate matrices in the primitive carbonaceous chondrites by transmission electron microscopy (TEM). In situ heating TEM experiments of the amorphous silicate matrices, that simulate thermal metamorphism of small bodies in the early solar system, revealed that nano-sized crystalline silicates newly formed in the matrices by replacing the amorphous silicates. The silicate crystals grew in the matrices as heating continued. These results can be used as barometers of thermal evolution of primitive solar materials in extraterrestrial samples.

  4. A model for formation and evolution of solid materials in space based on 3D structures of solar primitive materials.

    Akira Tsuchiyama, Kentaro Uesugi, Megumi Matsumoto

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    Category: Grant-in-Aid for Specially Promoted Research

    Institution: Kyoto University

    2015 - 2019

  5. Reproduction experiments of chondrules using a newly developed ambient-controlled levitation system

    Seto Yusuke, MIYAKE Akira, MATSUMOTO Megumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Kobe University

    2014/04/01 - 2017/03/31

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    We developed a gas-levitation system embedded in ambient-controlled tube furnace in order to reproduce micro-textures of chondrules, and to constrain their formation conditions.A vertical tube furnace was used as a heating device. An inner tube was inserted into the outer tube, and a gas-nozzle was set on at the top of the inner-tube. H2+CO2 mixed gas were introduced into the both inner and outer core tubes. Levitated samples were observed by a long focal CCD camera.Using the system, we demonstrated the containerless cooling experiments for molten silicate droplets. As stating materials, natural peridotite and oxide mixture corresponding to a type IIA chondrule were used. The present results showed that porphyritic texture is possible to be formed from fully molten states. The gas levitation system developed in the present study is a powerful technique to simulate the molten-quenched texture of early solar materials.