| 青藏高原东南缘金河—箐河断裂带右旋走滑变形的证据及构造意义 |
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| 关键词:the Southeast Tibet the Jinhe–Qinghe fault zone the dextral oblique-slip deformation the ductile shear zone |
| 基金项目:国家自然科学基金项目“川滇地块东部断裂带的右行走滑变形研究: 对青藏高原物质向东挤出的制约”(编号: 41872223);中国地质科学院基本科研业务费(编号: DZLXJK20171; YYWF201720) |
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| 摘要点击次数: 2008 |
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| 摘要: |
| The Study of the Dextral Oblique-slip Deformation of the Jinhe–Qinghe Fault, Southeast Tibet, and Its Tectonic Significance |
| The Cenozoic geological evolution of the southeastern margin of the Tibetan Plateau is a key issue to understanding the eastwards material propagation processes of Tibetan Plateau. The Jinhe–Qinghe fault zone, striking in NE direction, shows left-lateral strike-slipping now. However, the latest field geological survey discovered the northern segment of the Jinhe–Qinghe fault zone had experienced ductile shear deformation. The protoliths of the mylonite of the shear zone are volcanic tuff and rhyolitic volcanics. The meso- and micro-structure characteristics indicate dextral oblique-slip deformation. Microstructure analysis of these deformed minerals, such as quartz and feldspars, combined with the EBSD testing, suggests that the deformation temperature is ~400℃. Under reviewing the regional geological studies, this paper suggests that the dextral oblique-slip deformation might occur during Late Eocene to Early Miocene. It also needs further researches. This study might provide a new aspect and have a great significance to understanding the Early Cenozoic deformation and material propagation processes of the Southeast Tibet. |
| YIN Qi-hang,LI Hai-long,WANG Qiang-mao,ZHANG Yue-qiao,FAN Yan-xia.2020.The Study of the Dextral Oblique-slip Deformation of the Jinhe–Qinghe Fault, Southeast Tibet, and Its Tectonic Significance[J].Acta Geoscientica Sinica,41(3):371-383. |
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