| 引用本文: | 许志琴1 王 勤2 曾令森1 梁凤华1 李化启1 戚学祥1 蔡志慧1 李忠海1 曹 汇1. 高喜马拉雅的三维挤出模式[J]. 中国地质, 2013, 40(3): 671-680. |
| XU Zhi-qin1, WANG Qing2, ZENG Ling-sen1, LIANG Feng-hua1, LI Hua-qi1, QI Xue-xiang1, CAI Zhi-hui1, LI Zong-hai1, CAO Hui1. Three-dimensional extrusion model of the Great Himalaya slice[J]. Geology in China, 2013, 40(3): 671-680(in Chinese with English abstract). |
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| 摘要: |
| 提要：作为喜马拉雅造山带变质核的高喜马拉雅杂岩带，是以高级变质岩石、普遍的深熔反应以及高温韧性变形为主要特征的热碰撞造山带。在高喜马拉雅平行造山的韧性伸展构造发现的基础上，建立高喜马拉雅挤出的3-D 构造模式，并提出了挤出的动力学过程： （1）造成高喜马拉雅中弱和热物质产生的局部熔融阶段 （46～35 Ma），（2） 平行造山的韧性伸展和重力裂陷阶段（28～26 Ma开始），（3）韧性逆冲型剪切带形成阶段（＞626～23 Ma）， (4) MCT 和STD的形成造成的高喜马拉雅挤出阶段（23～17 Ma）。 |
| 关键词: 高喜马拉雅杂岩 3-D挤出模式 热碰撞造山 |
| DOI： |
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| 基金项目:国家自然科学基金委创新群体项目（40921001） 和中国地质调查局项目（1212010818094）资助。 |
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| Three-dimensional extrusion model of the Great Himalaya slice |
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XU Zhi-qin1, WANG Qing2, ZENG Ling-sen1, LIANG Feng-hua1, LI Hua-qi1, QI Xue-xiang1, CAI Zhi-hui1, LI Zong-hai1, CAO Hui11,2
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1. State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Department of Earth Science, Nanjing University, Nanjing 210093, Jiangsu, China
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| Abstract: |
| Abstract：The Greater Himalayan Complex (GHC) , as the metamorphic core of the Himalayan orogen, shows a “hot” collisional orogen characterized by high-grade (up to granulite facies) metamorphic rocks exhumed from the middle-lower crust, widespread migmatites from extensive anatectic processes and high-temperature ductile deformation. A three-dimensional tectonic model for extrusion of the GHC has been proposed based on the discovery of widespread orogen-parallel ductile extension. It is suggested that extrusion dynamic processes of the GHC are as follows： (1) partial melting in 45-36Ma resulting in the weak and hot middle crust, (2) orogen-parallel gravitational collapse in 28-26Ma, (3) ductile thrusting since > 26 Ma and (4) ductile extrusion resulting from the formation of MCT and STD during 23-17Ma . |
| Key words: Great Himalaya Complex three-dimensional extrusion model hot collisional orogen |
