Microscale Hydrogen, Carbon, and Nitrogen Isotopic Diversity of Organic Matter in Asteroid Ryugu
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arXiv
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| Natura: | Preprint |
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2024
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| author | Nittler, Larry R Barosch, Jens Burgess, Katherine Stroud, Rhonda M Wang, Jianhua Yabuta, Hikaru Enokido, Yuma Matsumoto, Megumi Nakamura, Tomoki Kebukawa, Yoko Yamashita, Shohei Takahashi, Yoshio Bejach, Laure Bonal, Lydie Cody, George D Dartois, Emmanuel Dazzi, Alexandre De Gregorio, Bradley Deniset-Besseau, Ariane Duprat, Jean Engrand, Cécile Hashiguchi, Minako Kilcoyne, A. L. David Komatsu, Mutsumi Martins, Zita Mathurin, Jérémie Montagnac, Gilles Mostefaoui, Smail Okumura, Taiga Quirico, Eric Remusat, Laurent Sandford, Scott Shigenaka, Miho Suga, Hiroki Takeichi, Yasuo Tamenori, Yusuke Verdier-Paoletti, Maximilien Wakabayashi, Daisuke Abe, Masanao Kamide, Kanami Miyazaki, Akiko Nakato, Aiko Nakazawa, Satoru Nishimura, Masahiro Okada, Tatsuaki Saiki, Takanao Tanaka, Satoshi Terui, Fuyuto Usui, Tomohiro Yada, Toru Yogata, Kasumi Yoshikawa, Makoto Yurimoto, Hisayoshi Noguchi, Takaaki Okazaki, Ryuji Naraoka, Hiroshi Sakamoto, Kanako Tachibana, Shogo Watanabe, Sei-ichiro Tsuda, Yuichi |
| author_facet | Nittler, Larry R Barosch, Jens Burgess, Katherine Stroud, Rhonda M Wang, Jianhua Yabuta, Hikaru Enokido, Yuma Matsumoto, Megumi Nakamura, Tomoki Kebukawa, Yoko Yamashita, Shohei Takahashi, Yoshio Bejach, Laure Bonal, Lydie Cody, George D Dartois, Emmanuel Dazzi, Alexandre De Gregorio, Bradley Deniset-Besseau, Ariane Duprat, Jean Engrand, Cécile Hashiguchi, Minako Kilcoyne, A. L. David Komatsu, Mutsumi Martins, Zita Mathurin, Jérémie Montagnac, Gilles Mostefaoui, Smail Okumura, Taiga Quirico, Eric Remusat, Laurent Sandford, Scott Shigenaka, Miho Suga, Hiroki Takeichi, Yasuo Tamenori, Yusuke Verdier-Paoletti, Maximilien Wakabayashi, Daisuke Abe, Masanao Kamide, Kanami Miyazaki, Akiko Nakato, Aiko Nakazawa, Satoru Nishimura, Masahiro Okada, Tatsuaki Saiki, Takanao Tanaka, Satoshi Terui, Fuyuto Usui, Tomohiro Yada, Toru Yogata, Kasumi Yoshikawa, Makoto Yurimoto, Hisayoshi Noguchi, Takaaki Okazaki, Ryuji Naraoka, Hiroshi Sakamoto, Kanako Tachibana, Shogo Watanabe, Sei-ichiro Tsuda, Yuichi |
| contents | We report the H, C, and N isotopic compositions of microscale (0.2 to 2$μ$m) organic matter in samples of asteroid Ryugu and the Orgueil CI carbonaceous chondrite. Three regolith particles of asteroid Ryugu, returned by the Hayabusa2 spacecraft, and several fragments of Orgueil were analyzed by NanoSIMS isotopic imaging. The isotopic distributions of the Ryugu samples from two different collection spots are closely similar to each other and to the Orgueil samples, strengthening the proposed Ryugu-CI chondrite connection. Most individual sub-$μ$m organic grains have isotopic compositions within error of bulk values, but 2-8% of them are outliers exhibiting large isotopic enrichments or depletions in D, $^{15}$N, and/or $^{13}$C. The H, C and N isotopic compositions of the outliers are not correlated with each other: while some C-rich grains are both D- and $^{15}$N-enriched, many are enriched or depleted in one or the other system. This most likely points to a diversity in isotopic fractionation pathways and thus diversity in the local formation environments for the individual outlier grains. The observation of a relatively small population of isotopic outlier grains can be explained either by escape from nebular and/or parent body homogenization of carbonaceous precursor material or addition of later isotopic outlier grains. The strong chemical similarity of isotopically typical and isotopically outlying grains, as reflected by synchrotron x-ray absorption spectra, suggests a genetic connection and thus favors the former, homogenization scenario. However, the fact that even the least altered meteorites show the same pattern of a small population of outliers on top of a larger population of homogenized grains indicates that some or most of the homogenization occurred prior to accretion of the macromolecular organic grains into asteroidal parent bodies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_08795 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Microscale Hydrogen, Carbon, and Nitrogen Isotopic Diversity of Organic Matter in Asteroid Ryugu Nittler, Larry R Barosch, Jens Burgess, Katherine Stroud, Rhonda M Wang, Jianhua Yabuta, Hikaru Enokido, Yuma Matsumoto, Megumi Nakamura, Tomoki Kebukawa, Yoko Yamashita, Shohei Takahashi, Yoshio Bejach, Laure Bonal, Lydie Cody, George D Dartois, Emmanuel Dazzi, Alexandre De Gregorio, Bradley Deniset-Besseau, Ariane Duprat, Jean Engrand, Cécile Hashiguchi, Minako Kilcoyne, A. L. David Komatsu, Mutsumi Martins, Zita Mathurin, Jérémie Montagnac, Gilles Mostefaoui, Smail Okumura, Taiga Quirico, Eric Remusat, Laurent Sandford, Scott Shigenaka, Miho Suga, Hiroki Takeichi, Yasuo Tamenori, Yusuke Verdier-Paoletti, Maximilien Wakabayashi, Daisuke Abe, Masanao Kamide, Kanami Miyazaki, Akiko Nakato, Aiko Nakazawa, Satoru Nishimura, Masahiro Okada, Tatsuaki Saiki, Takanao Tanaka, Satoshi Terui, Fuyuto Usui, Tomohiro Yada, Toru Yogata, Kasumi Yoshikawa, Makoto Yurimoto, Hisayoshi Noguchi, Takaaki Okazaki, Ryuji Naraoka, Hiroshi Sakamoto, Kanako Tachibana, Shogo Watanabe, Sei-ichiro Tsuda, Yuichi Earth and Planetary Astrophysics We report the H, C, and N isotopic compositions of microscale (0.2 to 2$μ$m) organic matter in samples of asteroid Ryugu and the Orgueil CI carbonaceous chondrite. Three regolith particles of asteroid Ryugu, returned by the Hayabusa2 spacecraft, and several fragments of Orgueil were analyzed by NanoSIMS isotopic imaging. The isotopic distributions of the Ryugu samples from two different collection spots are closely similar to each other and to the Orgueil samples, strengthening the proposed Ryugu-CI chondrite connection. Most individual sub-$μ$m organic grains have isotopic compositions within error of bulk values, but 2-8% of them are outliers exhibiting large isotopic enrichments or depletions in D, $^{15}$N, and/or $^{13}$C. The H, C and N isotopic compositions of the outliers are not correlated with each other: while some C-rich grains are both D- and $^{15}$N-enriched, many are enriched or depleted in one or the other system. This most likely points to a diversity in isotopic fractionation pathways and thus diversity in the local formation environments for the individual outlier grains. The observation of a relatively small population of isotopic outlier grains can be explained either by escape from nebular and/or parent body homogenization of carbonaceous precursor material or addition of later isotopic outlier grains. The strong chemical similarity of isotopically typical and isotopically outlying grains, as reflected by synchrotron x-ray absorption spectra, suggests a genetic connection and thus favors the former, homogenization scenario. However, the fact that even the least altered meteorites show the same pattern of a small population of outliers on top of a larger population of homogenized grains indicates that some or most of the homogenization occurred prior to accretion of the macromolecular organic grains into asteroidal parent bodies. |
| title | Microscale Hydrogen, Carbon, and Nitrogen Isotopic Diversity of Organic Matter in Asteroid Ryugu |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2404.08795 |