2021 Fiscal Year Annual Research Report
Geo-electrochemical Conversion of Amino Acids Induced by Aqueous Alteration in Carbonaceous Planetesimals
Publicly Offered Research
| Project Area | Aqua planetology |
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| Project/Area Number |
20H04608
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Li Yamei 東京工業大学, 地球生命研究所, 特任助教 (10745128)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Carbonaceous chondrite / Asteroid Ryugu / Aqueous alteration / Geo-electrochemistry / Amino acid decomposition / Mineral catalysis / Water-rock interaction |
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| Outline of Annual Research Achievements |
I have explored the geochemical processes that shaped organic distributions on the parent icy planetesimals of carbonaceous chondrite. In the past year, I further extended the model to the parent body of carbonaceous asteroid Ryugu. These research results have resulted in one published paper (Nature Communications, 2022) and one manuscript currently under review (Li et al., under review). Our major finding is that aqueous alteration can lead to complex behavior of organics on its parent body, including both synthetic and breakdown mechanisms. If the parent planetesimal is water/rock differentiated, the redox gradients between the water-rich mantle and water-depleted core can drive the decomposition of dicarboxylic amino acids to n-w-amino acids even at low temperature (e.g., 25 oC).
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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