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

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.

Authors

Institutions

Publication Details

Journal
Meteoritics and Planetary Science
Published
2024-12-24
DOI
https://doi.org/10.1111/maps.14304
Citations
1
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
0.33

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

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

Megumi Matsumoto, Hiroshi Naraoka, Ryuji Okazaki, Yuichi Tsuda et al.
1 citations
Meteoritics and Planetary Science
Astro and Planetary Science
0.33
article

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

Megumi Matsumoto, Hiroshi Naraoka, Ryuji Okazaki, Yuichi Tsuda, Masahiro Nishimura, Kanako Sakamoto, Sei‐ichiro Watanabe, Z. Djouadi, Christophe Sandt, Shogo Tachibana, Takaaki Noguchi, Kana Amano, Aiko Nakato, R. Brunetto, Makoto Yoshikawa, Stefano Rubino, Masanao Abe, Hisayoshi Yurimoto, Tomohiro Usui, Tomoyo Morita, Hikaru Yabuta, Toru Yada, Takanao Saiki, Alice Aléon‐Toppani, Satoru Nakazawa, Lauriane Delaye, Fuyuto Terui, Satoshi Tanaka, Ferenc Borondics, D. Baklouti, C. Lantz, Z. Dionnet, Akiko Miyazaki, L. Caron, Kasumi Yogata, Tomoki Nakamura, Tatsuaki Okada
article en
1 citations

Abstract

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.

Meteoritics and Planetary ScienceVol. 60(2)
Hiroshima University (JP), Centre National de la Recherche Scientifique (FR), Kyushu University (JP), Kanagawa Institute of Technology (JP), Tohoku University (JP), Hokkaido University (JP), Université Paris-Saclay (FR), Japan Aerospace Exploration Agency (JP), Synchrotron soleil (FR), Institute for Space Astrophysics and Planetology (IT), Institut d'Astrophysique Spatiale (FR), Higashihiroshima Medical Center (JP), Institute of Space and Astronautical Science (JP), Nagoya University (JP), The University of Tokyo (JP)
Centre National d’Etudes Spatiales, Ministry of Education, India
Openalex Percentile: Top 32%
Astro and Planetary Science
0.33
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.