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Widespread Tissintite in Strongly Shock-Lithified Lunar Regolith Breccias

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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
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
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)

Submitter: 圦本 尚義

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