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pseudotachylyte-Induced Weakness of Plate-Boundary Fault:Insight from the Indus-Tsangpo Suture between India and Asia

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Acta Geologica Sinica(English Edition) 2019年第1期93卷 1-11页

作者： XU Zhiqin JI Shaocheng ZHOU Xin School of Earth Sciences and Engineering Nanjing University Département des Génies Civil Géologique et des Mines école Polytechnique de Montréal Institute of Geology Chinese Academy of Geological Sciences

Although the Indus-Tsangpo Suture(ITS) is the most spectacular thrust system of continent-continent collision in the world, fundamental questions about its strength evolution and deformation behavior transition remain unanswered. Here we reported, for the first time, frictional melting-induced pseudotachylytes in the intensively deformed felsic rocks along the ITS zone in southern Tibet. This study reveals that pseudotachylytes induced profound weakness of the boundary fault between Indian and Asian plates. The intrinsically low strength of the foliated microlites crystallized from frictional melt or glass(i.e., pseudotachylyte) at seismogenic depths compared with the surrounding coarse-grained quartzofeldspathic rocks in the brittle and semi-brittle regime is sufficient to explain the localization of shear strain, the development of ductile shear zones embedded in strong wall rocks, and the transition from the strong to weak fault behaviors without invoking the presence of high fluid pressure or low friction coefficient metasomatic materials(e.g., smectite or lizardite) within the faults.

关键词： pseudotachylyte mylonite fault strength strain localization Indus-Tsangpo suture Tibet

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Raman spectral analysis and genetic mechanism of pseudotachylyte in Xiaoqinling detachment fault

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Science China Earth Sciences 1998年第3期41卷 242-247页

作者：张进江刘树文郑亚东陈晶石铨曾尉向东薛良伟 1. Department of Geology Peking University 100871 Beijing China 3. EM Laboratory Peking University 100871 Beijing China 4. Institute of Geological Science Henan Province 450053 Zhengzhou China

Veins and clasts of pseudotachylyte developed in the microbreccias of the detachment fault along the boundary of the Xiaoqinling metamorphic core complex. The Raman spectral analysis shows that there are three kinds of textures in the matrices of the pseudotachylyte, i.e. ultracataclastic fine grained texture, cryptocrystalline texture and both of them with minute quantity of glass. The three different textures are the results of different degrees of ultracataclasis. This demonstrates that ultracataclasis comminution melting is the genetic mechanism of the pseudotachylytes in the Xiaoqinling detachment fault and the ultracataclasis comminution dominates in their formation.

关键词： pseudotachylyte Raman spectral analysis ultracataclasis genetic mechanism.

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