研究者詳細

顔写真

マツモト メグミ
松本 恵
Megumi Matsumoto
所属
大学院理学研究科 地学専攻 地球惑星物質科学講座
職名
助教
学位
  • 博士(理学)(神戸大学)

  • 修士(理学)(神戸大学)

e-Rad 研究者番号
50725455

経歴 3

  • 2018年6月 ~ 継続中
    東北大学 理学研究科 地学専攻 助教

  • 2017年4月 ~ 2018年5月
    京都大学 理学研究科 地質学・鉱物学講座 特定研究員

  • 2013年10月 ~ 2017年3月
    神戸大学 研究基盤センター 特命技術員

学歴 3

  • 神戸大学 理学研究科 地球惑星科学専攻 博士後期課程

    2012年4月 ~ 2013年9月

  • 神戸大学 理学研究科 地球惑星科学専攻 博士前期課程

    2010年4月 ~ 2012年3月

  • 神戸大学 理学部 地球惑星科学科

    2006年4月 ~ 2010年3月

所属学協会 3

  • Meteoritical Society

    2018年 ~ 継続中

  • 日本地球惑星科学連合

  • 日本鉱物科学会

研究キーワード 3

  • 透過型電子顕微鏡

  • 惑星物質科学

  • 炭素質コンドライト

研究分野 1

  • 自然科学一般 / 固体地球科学 / 惑星物質科学

論文 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年12月24日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14304  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年8月29日

    出版者・発行元: Springer Science and Business Media LLC

    DOI: 10.1038/s41467-024-51731-w  

    eISSN:2041-1723

    詳細を見る 詳細を閉じる

    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年7月

    出版者・発行元: 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年6月

    出版者・発行元: 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年4月

    出版者・発行元: 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年2月26日

    出版者・発行元: EDP Sciences

    DOI: 10.1051/0004-6361/202347435  

    ISSN:0004-6361

    eISSN:1432-0746

    詳細を見る 詳細を閉じる

    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年2月

    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年1月25日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14128  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年1月19日

    出版者・発行元: American Association for the Advancement of Science (AAAS)

    DOI: 10.1126/sciadv.adi7203  

    eISSN:2375-2548

    詳細を見る 詳細を閉じる

    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年1月8日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14122  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年1月5日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14124  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年

    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年

    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年11月22日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14093  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年11月14日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14101  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年11月13日

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14097  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年9月

    出版者・発行元: Wiley

    DOI: 10.1111/maps.14068  

    ISSN:1086-9379

    eISSN:1945-5100

    詳細を見る 詳細を閉じる

    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年4月24日

    出版者・発行元: Springer Science and Business Media LLC

    DOI: 10.1038/s41598-023-33595-0  

    eISSN:2045-2322

    詳細を見る 詳細を閉じる

    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年4月

    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年3月16日

    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年3月

    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年2月24日

    出版者・発行元: 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年2月24日

    出版者・発行元: American Association for the Advancement of Science (AAAS)

    DOI: 10.1126/science.abn9057  

    ISSN:0036-8075

    eISSN:1095-9203

    詳細を見る 詳細を閉じる

    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 査読有り

    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年2月24日

    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年1月9日

    出版者・発行元: Springer Science and Business Media LLC

    DOI: 10.1186/s40623-022-01762-8  

    eISSN:1880-5981

    詳細を見る 詳細を閉じる

    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年12月

    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 査読有り

    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年11月4日

    出版者・発行元: 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 査読有り

    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年9月28日

    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 査読有り

    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年4月

    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 査読有り

    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年11月9日

    出版者・発行元: 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 査読有り

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

    Geochimica et Cosmochimica Acta 312 75-105 2021年11月

    出版者・発行元: 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 査読有り

    Mayumi Mujin, Michihiko Nakamura, Megumi Matsumoto

    Journal of Crystal Growth 560-561 126043-126043 2021年4月

    出版者・発行元: 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 査読有り

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

    Geochimica et Cosmochimica Acta 293 86-102 2021年1月

    出版者・発行元: 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 査読有り

    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年3月

    出版者・発行元: 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. 国際誌 査読有り

    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年11月

    DOI: 10.1126/sciadv.aax5078  

    詳細を見る 詳細を閉じる

    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 査読有り

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

    Materials Transactions 60 (4) 554-560 2019年1月

    出版者・発行元: J-STAGE

    DOI: 10.2320/matertrans.Y-M2019803  

  37. Microstructure of Ti-Ag immiscible alloys with liquid phase separation 査読有り

    Takeshi Nagase, Megumi Matsumoto, Yoshikazu Fujii

    Journal of Alloys and Compounds 738 440-447 2018年3月25日

    出版者・発行元: Elsevier Ltd

    DOI: 10.1016/j.jallcom.2017.12.138  

    ISSN:0925-8388

  38. Acfer094隕石に見つかったプレソーラーケイ酸塩粒子の3次元微細組織観察

    松本 恵, 松野 淳也, 三宅 亮, 中藤 亜衣子, 土`山 明, 伊藤 元雄, 富岡 尚敬, 兒玉 優, バッカロ エピファニオ

    日本鉱物科学会年会講演要旨集 2018 132 2018年

    出版者・発行元: 一般社団法人日本鉱物科学会

    DOI: 10.14824/jakoka.2018.0_132  

    詳細を見る 詳細を閉じる

    始原的隕石中には、稀に太陽系の安定同位体比と異なる組成をもつプレソーラー粒子が含まれている。それらは、進化末期の星において、ガスからの凝縮で形成したと考えられている。そのような星周での固体物質形成の素過程は未だよく分かっておらず、解明には個々のプレソーラー粒子の詳細な観察が必要である。本研究では、Acfer094隕石に見つかったプレソーラーケイ酸塩粒子について詳細なTEM観察とSTEM-EDS tomographyを行い、得られた3次元微細組織情報からその形成過程を推定した。

  39. Discovery of moganite in a lunar meteorite as a trace of H2O ice in the Moon’s regolith 査読有り

    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年

    DOI: 10.1126/sciadv.aar4378  

    ISSN:2375-2548

  40. Microstructure and magnetic properties of Cu-Ag-La-Fe immiscible alloys with an amorphous phase 査読有り

    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年

    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 査読有り

    Megumi Matsumoto, Kazushige Tomeoka, Yusuke Seto

    GEOCHIMICA ET COSMOCHIMICA ACTA 208 220-233 2017年7月

    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 査読有り

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

    JOURNAL OF STRUCTURAL GEOLOGY 95 127-141 2017年2月

    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 査読有り

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

    Materials & Design 117 338-345 2017年1月

    DOI: 10.1016/j.matdes.2016.12.092  

  44. Coherent interface structures and intergrain Josephson coupling in dense MgO/Mg2Si/MgB2 nanocomposites 査読有り

    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年7月

    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年8月

    ISSN:1086-9379

    eISSN:1945-5100

  46. Reply to comment by Nazaka (2014) on “Dehydration breakdown of antigorite and the formation of B-type olivine CPO” 査読有り

    Nagaya T, Simon R. W, Kobayashi H, Michibayashi K, Mizukami T, Seto Y, Miyake A, Matsumoto M

    Earth and Planetary Science Letters 408 406-407 2014年12月

    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 査読有り

    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年2月

    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 査読有り

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

    GEOCHIMICA ET COSMOCHIMICA ACTA 126 441-454 2014年2月

    DOI: 10.1016/j.gca.2013.11.016  

    ISSN:0016-7037

    eISSN:1872-9533

  49. Ningqiang 隕石中のネフェリンの分布と鉱物学的特徴 : TEM, SR-XRDによる研究

    松本 恵, 留岡 和重, 瀬戸 雄介, 杉田 光弘

    日本鉱物科学会年会講演要旨集 2011 259-259 2011年9月5日

    出版者・発行元: 日本鉱物科学会

    DOI: 10.14824/jakoka.2011.0.254.0  

    ISSN:1348-6543

    詳細を見る 詳細を閉じる

    特異な炭素質コンドライトとされるNingqiang隕石中のCAIは、これまでの研究から、大規模なNa交代変成を受けており、多量のネフェリンを含んでいることがわかっている。今回我々は、Ningqiang隕石のNa交代変成過程を明らかにするため、コンドリュールとマトリックスについても詳細な観察、分析を行った。その結果、多くのコンドリュールがネフェリンを含んでおり、それらのネフェリンはメソスタシス中の斜長石を交代して形成していることがわかった。また、マトリックスにもほぼ全体に渡って、微小なオリビン包有物を含むネフェリン粒子がほぼ均質に分布していることがわかった。このように隕石全岩に渡ってネフェリンが分布していることから、CAI、コンドリュール、マトリックス中のネフェリンは、いずれも隕石母天体中での大規模なNa交代変成によって形成されたと考えられる。

︎全件表示 ︎最初の5件までを表示

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年7月

    出版者・発行元: 大阪 : 日本放射光学会

    ISSN: 0914-9287

  2. 放射光X線CTを用いたDaG999ユレイライト中炭素粒子の内部構造観察

    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年

  3. はやぶさ2リターンサンプル表面の微隕石衝突メルトとマイクロクレータのナノCT・TEM分析

    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年

  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年

    ISSN: 2433-0582

  5. 高分解能X線CTを用いた蛇紋石脈微細構造の解明

    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年

  6. タヒチ島産マントルカンラン岩中の白金族鉱物を含むメルト包有物

    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年

  7. SIXMによるユレイライト中炭素質物質の分析

    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年

  8. はやぶさ2リターンサンプルC0002粒子に含まれる様々な岩相の電子顕微鏡観察と放射光ナノCT分析

    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年

  9. リュウグウから見つかった白金族元素硫化物のナゲット

    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年

  10. はやぶさ2リターンサンプルに含まれるマグネタイト粒子の3次元形状:多様性とその意味

    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年

  11. 炭素質コンドライトの高分解能イメージング質量分析: CHN化合物の分布が示す初期太陽系での有機物生成

    古川 善博, 三枝 大輔, 可野 邦行, 宇留野 晃, 齋藤 律水, 伊藤 元雄, 松本 恵, 青木 淳賢, 山本 雅之, 中村 智樹

    日本地球化学会年会要旨集 69 190 2022年

    出版者・発行元: 一般社団法人日本地球化学会

    DOI: 10.14862/geochemproc.69.0_190  

    詳細を見る 詳細を閉じる

    炭素質コンドライトに含まれる低分子量の可溶性有機物は、初期太陽系の環境を推定するための指標となる可能性がある。このような有機分子の研究は、ほとんどの場合が抽出液の分析によって行われてきた。本研究では表面支援レーザー脱離イオン化質量分析(SALDI)法により高空間分解能で炭素質コンドライト中の多種の有機物の空間分布を測定した。検出された多様なCHN化合物は同族体であり、類似した不均質な分布を示した。このことは、逐次反応が隕石構成微粒子ごとに起こっていること示しており、CHN化合物の生成が母天体集積前に起こったことを示唆している。

  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年

  13. 分析型放射光ナノCT法の開発とはやぶさ2サンプル分析への応用

    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年

  14. リュウグウ試料リハーサル分析としてのCM,CI隕石とその加熱試料の高空間分解能三色CT

    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年

  15. 非加熱・実験加熱Murchison隕石の放射光X線CT

    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年

  16. Acfer094隕石中の宇宙シンプレクタイトのTEM観察

    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年

  17. 中国レス中の土壌化起源磁性ナノ粒子のTEM観察

    松本恵, 瀬戸雄介, 佐野拓郎, 鈴木康太, 兵頭政幸, 三宅亮, 浜根大輔, 境家達弘

    日本鉱物科学会年会講演要旨集 2016 124 2016年

    出版者・発行元: 一般社団法人日本鉱物科学会

    DOI: 10.14824/jakoka.2016.0_124  

    ISSN: 1348-6543

    詳細を見る 詳細を閉じる

    中国レスの土壌化に伴う磁気増大は,磁性粒子の生成が原因であると考えられているが,光学顕微鏡レベルでは未だ確認されていない。そこで本研究では,磁気増大現象の素過程を理解するため,中国レスについて,XRDとSEM/STEM観察を行い,磁性粒子の結晶相・体積比率・存在形態を調べた。XRDの結果,レス中の磁性鉱物(hematite, magnetite)の体積比率は非常に低い(< 1vol.%)ことがわかった。TEM観察の結果,これらの磁性鉱物は,土壌化(風化)の進んだmuscovite中にナノサイズの包有物として含まれていた。包有物はmuscoviteの土壌化(風化)に伴って二次的に形成した可能性が高い。特にmagnetiteは強い磁性をもつため,主にその生成が磁気増大の原因になっていると考えられる。発表では,これら土壌化起源magnetiteの特徴を詳しく紹介する。

  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年

    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年10月24日

    出版者・発行元: 日本惑星科学会

  20. Ningqiang 隕石および Warrenton CO 隕石のNa交代変成 : 水質変成作用との関係

    松本 恵, 留岡 和重, 瀬戸 雄介, 三宅 亮

    日本鉱物科学会年会講演要旨集 2012 181-181 2012年9月15日

    ISSN: 1348-6543

︎全件表示 ︎最初の5件までを表示

講演・口頭発表等 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年3月9日

  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年3月9日

  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年3月7日

  4. 隕石中の氷の痕跡とその母天体進化 招待有り

    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年11月25日

  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年9月

  9. MgO–SiO2 系非晶質ケイ酸微粒子の 水質変成過程その場観察

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

    日本鉱物科学会2020年年会 2020年9月

  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

    JpGU - AGU Joint Meeting 2020 2020年7月

  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

    JpGU - AGU Joint Meeting 2020 2020年7月

  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

    JpGU - AGU Joint Meeting 2020 2020年7月

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

    M. Matsumoto, A. Tsuchiyama, M. Yasutake, A. Miyake, K. Uesugi, A. Takeuchi, T. Nakano, T. Nakamura

    JpGU - AGU Joint Meeting 2020 2020年7月

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

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

    51st Lunar and Planetary Science Conference 2020年3月

  15. 珪酸塩メルト中での金属粒子の結晶成長その場観察

    無盡真弓, 中村美千彦, 松本恵

    日本鉱物科学会2019年年会 2019年9月20日

  16. Acfer 094 隕石中の宇宙シンプレクタイトのTEM観察

    松本恵, 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, バッカロ・エピファニオ

    日本鉱物科学会2019年年会 2019年9月20日

  17. Experimental heating of a hydrated carbonaceous chondrite to simulate solar radiation heating of 3200 Phaethon 国際会議

    Kobayashi S, Nakamura T, Amano K, Matsumoto M

    The 82nd Annual Meeting of the Meteoritical Society 2019年7月7日

  18. Formation processes of secondary dmisteinbergite and anorthite in Allende CAI 国際会議

    Enokido Y, Nakamura T, Matsumto M, Miyake A

    The 82nd Annual Meeting of the Meteoritical Society 2019年7月7日

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

    Hashimoto Y, Nakamura T, Matsumoto M

    The 82nd Annual Meeting of the Meteoritical Society 2019年7月7日

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

    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年7月7日

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

    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年7月7日

  22. レス中白雲母が含有する大量の磁鉄鉱・赤鉄鉱ナノ粒子

    兵頭政幸, 佐野拓郎, 松本恵, 瀬戸雄介, 鈴木康太, 楊 天水

    日本地球惑星科学連合2019 2019年5月26日

  23. Acfer 094 隕石中の宇宙シンプレクタイトの3次元微細組織観察

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

    日本地球惑星科学連合2019 2019年5月26日

  24. Three-dimensional microstructure of a presolar silicate in the Acfer 094 carbonaceous chondrite 国際会議

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

    第9回 極域科学シンポジウム 2018年12月4日

  25. Acfer094隕石に見つかったプレソーラーケイ酸塩粒子の3次元微細組織観察

    松本恵, 松野淳也, 三宅亮, 中藤亜衣子, 土`山明, 伊藤元雄, 富岡尚敬, 兒玉優, バッカロ・エピファニオ

    日本鉱物科学会2018年年会 2018年9月

  26. An ultra porous lithology in the primitive carbonaceous chondrite Acfer 094: Investigation for pristine planetary materials 国際会議

    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年7月

  27. 始原的炭素質コンドライトAcfer094マトリクスの微細組織観察:太陽系始原物質の探索

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

    日本地球惑星科学連合2018年大会 2018年5月

  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

    杉本美弥茉, 土`山明, 松本恵, 伊神洋平, 三宅亮

    日本惑星科学会2017年秋季講演会 2017年9月

  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

    北山晃, 土`山明, 三宅亮, 中野司, 竹内晃久, 上杉健太郎, 松本恵, 松野淳也, 伊藤正一

    日本惑星科学会2017年秋季講演会 2017年9月

  30. Acfer094隕石に見つかった超多孔質岩相の微細組織観察

    松本恵, 中藤亜衣子, 土`山明, 松野淳也, 三宅亮, 上杉健太郎, 竹内晃久, 中野司, バッカロ・エピファニオ

    日本鉱物科学会2017年年会 2017年9月

  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年8月

  32. 中国レス中の土壌化起源磁性ナノ粒子の電子顕微鏡観察

    松本恵, 瀬戸雄介, 佐野拓郎, 兵頭政幸, 三宅亮

    日本顕微鏡科学会第74回学術講演会 2017年6月

  33. 始原的炭素質コンドライトAcfer094マトリクスの3次元構造:非晶質ケイ酸塩の探索

    中藤亜衣子, 土`山明, 松本恵, 松野淳也, 三宅亮, 上杉健太郎, 竹内晃久, 中野司, バッカロ・エピファニオ, ラッセル・サラ

    日本地球惑星科学連合2017年大会 2017年5月

  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

    日本鉱物科学会2016年年会 2016年9月

  35. Semi-automatically indexing of complex electron diffraction pattern

    Seto Y, Matsumoto M

    日本鉱物科学会2016年年会 2016年9月

  36. 中国レス中の土壌化起源磁性ナノ粒子のTEM観察

    松本恵, 瀬戸雄介, 佐野拓郎, 鈴木康太, 兵頭政幸, 三宅亮, 浜根大輔, 境家達弘

    日本鉱物科学会2016年年会 2016年9月

  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年5月

  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年5月

  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年5月

  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年5月

  41. Micro IR/Raman observations of PM2.5 sampled in Osaka 国際会議

    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年

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

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

    Goldschmidt 2016 2016年

  43. Microstructure of Al-Co-La-Pb immiscible alloys with an amorphous phase 国際会議

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

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

  44. Hydrated, unmetamorphosed clasts in the NWA 1232 CO3 carbonaceous chondrite 国際会議

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

    MetSoc 2015 2015年8月

  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年5月

  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年

  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年

  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年

  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年9月

  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年9月

  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

    日本地球惑星科学連合2014年大会 2014年5月

  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

    日本鉱物科学会2013年年会 2013年9月

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

    Matsumoto M, Tomeoka K, Seto Y, Miyake A

    日本鉱物科学会2012年年会 2012年9月

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

    Matsumoto M, Seto Y, Miyake A, Tomeoka K

    日本地球惑星科学連合2012年大会 2012年5月

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

    Matsumoto M, Tomeoka K, Seto Y, Sugita M

    日本鉱物科学会年2011年会 2011年9月

︎全件表示 ︎最初の5件までを表示

共同研究・競争的資金等の研究課題 5

  1. 太陽系形成時の化学環境の解明

    橘 省吾, 薮田 ひかる, 奈良岡 浩, 岡崎 隆司, 圦本 尚義, 松本 恵, 瀧川 晶

    提供機関:Japan Society for the Promotion of Science

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

    研究種目:Grant-in-Aid for Transformative Research Areas (A)

    研究機関:The University of Tokyo

    2020年11月 ~ 2025年3月

    詳細を見る 詳細を閉じる

    太陽系も他の惑星系と同様,原始太陽の周囲に原始太陽系円盤がつくられることで誕生した.原始太陽系円盤も,電波天文観測で捉えられている惑星系形成領域の多様な化学環境のいずれかを初期状態とし,地球を含む惑星に至るまで進化したと考えられる.分子で観測される惑星系形成領域の化学的多様性に,太陽系の初期状態がどのように位置づけられ,太陽系がその形成時にどのような化学過程を経たのか,を明らかにすることが本課題の目的である.中間温度・中間密度環境で様々な化学反応が起こりうる惑星系形成領域での多様な化学を理解するためには,観測や分析の結果のみから推定するのではなく,原子・分子レベルでの素過程に立ち戻り,新たな学理を構築する必要がある.本領域で物理・化学分野との協働で進める素過程の解明に基づき,惑星系形成領域の化学的多様性を理解し,太陽系の初期化学状態をその中に位置づけることを目的とする.当該年度は小惑星探査機「はやぶさ2」が持ち帰った近地球C型小惑星リュウグウ試料の初期分析をおこない,無機化学(元素,同位体)・鉱物学・岩石学・有機化学(固体有機物,可溶性有機分子)の観点から,その詳細を明らかにし,既存の隕石との比較をおこなった.また,リュウグウに存在する鉱物のひとつである炭酸塩の真空分解実験をおこない,分解速度をもとにして,リュウグウが近地球側小惑星として経験した最も太陽に近い軌道条件の制約をおこなった.

  2. 太陽系始原物質形成・進化の統一モデルの構築

    土山 明, 三宅 亮, 松本 恵, 奥住 聡

    提供機関:Japan Society for the Promotion of Science

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

    研究種目:Grant-in-Aid for Scientific Research (A)

    研究機関:Ritsumeikan University

    2020年4月 ~ 2025年3月

    詳細を見る 詳細を閉じる

    本研究の目的は「太陽系始原物質は共通した局所加熱イベントにより生成、氷や有機物とともに母天体として集積、隕石母天体は散乱により内側の小惑星帯へと移動した」という作業仮説を検証するために、高温物質の再現実験、再現物の水質変成実験、太陽系始原物質の分析、理論的考察により作業仮説を行い、太陽系始原物質形成・進化の統一モデルを構築することである。研究実施計画のうち、当該年度で到達された主な成果は以下の通りである。 コンドリュール、マトリクスの同時生成プロセスの解明:彗星塵に含まれる非晶質ケイ酸塩微粒子の再現実験の論文(Kim et al. 2021)、彗星塵に含まれる非晶質ケイ酸塩微粒子の3次元構造観察によりその太陽系起源を明らかにした論文(Matsuno et al. 2021)を発表した。 炭素質コンドライト母天体の生成領域の特定:はやぶさ2サンプルの初期分析により試料中にCO2に富む流体を見出し、CM隕石だけでなくこのCI隕石に対応する物質も木星軌道の外側の領域で生成されたことを明らかにし(学会発表:Zelensky et al., 2022)、新しく発見された始原的炭素質コンドライトの3次元構造からその起源を議論する論文(Noguchi et al. 2021)、宇宙線の打ち込みよる水の生成が酸化鉱物で起こっていることを指摘した論文(Igami et al. 2021)を発表した。 はやぶさ2サンプル分析への応用:はやぶさ2探査機の試料採取の詳細について報告し、試料が小惑星リュウグウの物質を代表していることを明らかにした(Tachibana et al. 2022)。はやぶさ2サンプル分析のリハーサル分析を進めるとともに、実際のサンプル初期分析を行い、C型小惑星リュウグウ物質が地球上での変質のないCI隕石に対応することを明らかにした(学会発表、論文投稿中)。

  3. 非晶質ケイ酸塩の“高温その場TEM観察”から探る初期太陽系の固体物質進化過程

    松本 恵

    提供機関:Japan Society for the Promotion of Science

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

    研究種目:Grant-in-Aid for Early-Career Scientists

    研究機関:Tohoku University

    2019年4月 ~ 2022年3月

    詳細を見る 詳細を閉じる

    本研究の最終目標は、隕石など太陽系始原物質中の非晶質ケイ酸塩の加熱に伴う変化の詳細を実験的に明らかにすることである。近年の研究から、非晶質ケイ酸塩は初期太陽系内に普遍的に存在し、天体の主要な固体原材料となったことがわかってきており、その熱進化過程を明らかにすることは、太陽系の固体物質進化過程を明らかにするうえで重要である。1年目にあたる本年度は、未加熱(天然)隕石試料中の非晶質ケイ酸塩の微細組織・化学組成を明らかにするため、3つの始原的炭素質隕石(Acfer094隕石、MIL090657隕石、NWA1232隕石)について、X線CTと透過型電子顕微鏡(TEM)による観察・分析を行った。観察の結果、非晶質ケイ酸塩はこれらの隕石の主要な構成物の一つであり、細粒なマトリクス中に広く分布することがわかった。また、それら非晶質ケイ酸塩粒子は大きさ数百nm~数umと小さく、母天体で水との相互作用を経て様々な程度に含水化しており、ナノサイズの硫化鉄など鉱物粒子をインクルージョンとして含むことも明らかとなった。非晶質ケイ酸塩の化学組成、インクルージョンの鉱物相は、3つの隕石で類似しているが、含水化の程度は、隕石ごと、また一つの隕石内でも領域ごとに異なっていることがわかった。これら水との相互作用による非晶質ケイ酸塩粒子の変化の詳細については、観察結果をもとに解析中である。隕石中の非晶質ケイ酸塩についての研究はまだ数少なく、今回得られた観察結果は、新たな記載例として、また今後の加熱実験試料との比較材料としても重要である。

  4. 太陽系始原物質の3次元構造から探る宇宙・太陽系における固体物質の生成・進化モデル

    土山 明, 上杉 健太朗, 松本恵

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    研究種目:Grant-in-Aid for Specially Promoted Research

    研究機関:Kyoto University

    2015年 ~ 2019年

    詳細を見る 詳細を閉じる

    1. 星周および原始太陽系円盤における凝縮プロセス(固体物質の生成)の研究 高周波誘導熱プラズマ(ITP)装置を用いた凝縮実験を、硫黄を含むFe-Mg-Si-O-S系に拡張し、彗星塵中のGEMSと呼ばれる非晶質珪酸塩微粒子や始原的炭素質コンドライト中のGEMS様物質の再現に成功すると共に、酸化還元条件の違いにより、多様なGEMS様粒子が生成されることを明らかにした。 2. 星間および太陽系天体表面における変成プロセス(固体物質の進化)の研究 低エネルギーイオン照射装置を用いて、太陽風に相当する1 keV H^+ビームの輝石への照射実験を進め、宇宙風化層の生成条件を系統的に調べた。これにより、イトカワ粒子の宇宙風化層生成は、10^3年以下の早い速度で起こることが示された。摩耗実験を進め、イトカワ表面では粒子の摩耗は起こり得ず、イトカワ母天体での衝突により摩耗された粒子がイトカに存在すると考えられることがわかった。 3. 太陽系始原物質(彗星塵と隕石)の3次元構造の研究 吸収-位相コントラストを用いた3色ナノCT法(分解能 : 100nm)の定量性を向上させ、炭素質コンドライトマトリクスの密度や化学組成を推定した。昨年度この手法を用いて始原的炭素質コンドライトより、彗星塵に類似した多孔質で非晶質珪酸塩を含む岩相(超多孔質岩相)を発見したが、その空隙がかつて氷を含み「氷の化石」である可能性を指摘した。さらに局所同位体分析によりこの岩相が太陽系起源であることを示すとともに、隕石試料中に普遍的に存在することを示した。また、他の隕石試料より見出した始原的な岩相との比較から、GEMS様物質には多様性があることを指摘した。1で述べた凝縮実験結果と総合することにより、彗星塵や始原的炭素質コンドライトに含まれるGEMSおよびGEMS様物質は、太陽系の異なる領域で形成された始原物質であるというシナリオを得た。

  5. 雰囲気制御・無容器加熱法によるコンドリュール再現実験の新展開

    瀬戸 雄介, 三宅 亮, 松本 恵

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research

    研究種目:Grant-in-Aid for Challenging Exploratory Research

    研究機関:Kobe University

    2014年4月1日 ~ 2017年3月31日

    詳細を見る 詳細を閉じる

    コンドリュールは45.6億年前に形成した太陽系最古の物質である。本研究では、再現実験からコンドリュールの加熱・冷却環境を制約することを目的として、雰囲気制御炉と浮遊加熱法を組み合わせたシステムを開発した。ベースとなる炉体として縦型管状炉を使用し、内部にガスノズルを設置して、雰囲気制御下での浮遊溶融実験を可能にした。このシステムを使って、天然の岩石やコンドリュールを模擬した組成物質の浮遊溶融実験を行ったところ、自形性の高い斑状のカンラン石が全溶融状態から晶出することが分かった。この結果は、これまで考えられていたコンドリュール形成モデルの修正を迫るものである。