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Widespread Tissintite in Strongly Shock-Lithified Lunar Regolith Breccias
| Title: | Widespread Tissintite in Strongly Shock-Lithified Lunar Regolith Breccias |
| Authors: | Zhang, Ai-Cheng Browse this author | | Jiang, Qin-Ting Browse this author | | Tomioka, Naotaka Browse this author | | Guo, Yan-Jun Browse this author | | Chen, Jia-Ni Browse this author | | Li, Yang Browse this author | | Sakamoto, Naoya Browse this author | | Yurimoto, Hisayoshi Browse this author →KAKEN DB |
| Keywords: | corundum | | lunar breccia | | lunar regolith | | shock-lithification | | tissintite |
| Issue Date: | 16-Mar-2021 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical research letters |
| Volume: | 48 |
| Issue: | 5 |
| Start Page: | e2020GL091554 |
| Publisher DOI: | 10.1029/2020GL091554 |
| Abstract: | Shock-lithification is a fundamental process of making rocks from fine-grained and porous regoliths on the surface of the Moon. Previous investigations have constrained potential shock pressures during shock-lithification based on experimental and numerical simulations. However, pressure and temperature conditions during shock-lithification have not been directly inferred from natural lunar breccias. Here, we report the discovery of widespread tissintite in strongly shock-lithified lunar meteorites, accompanied occasionally by Si-rich corundum and coesite. The coexistence of tissintite and coesite and the absence of stishovite in molten regions indicate a shock pressure of 4-8 GPa, which might be the pressure boundary between weak and strong shock-lithification. Meanwhile, the presence of Si-rich corundum imposes a temperature constraint of similar to 2,300 K for the intergranular melts. This temperature constraint has profound significance for interpreting the behaviors of volatile and moderately volatile elements and remanent magnetization records during strongly shock-lithification of lunar breccias. |
| Rights: | Copyright 2021 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82680 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 圦本 尚義
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