| 西藏罗布莎-泽当蛇绿岩体的构造产出与侵位机制探讨 |
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| 引用本文： | 梁凤华,许志琴,巴登珠,徐向珍,刘飞,熊发挥,贾毅.西藏罗布莎-泽当蛇绿岩体的构造产出与侵位机制探讨[J].岩石学报,2011,27(11):3255-3268. |
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| 作者姓名： | 梁凤华 许志琴 巴登珠 徐向珍 刘飞 熊发挥 贾毅 |
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| 作者单位： | 1. 大陆构造与动力学国家重点实验室,中国地质科学院地质研究所,北京100037
2. 西藏地质局第二地质大队,拉萨,850007 |
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| 基金项目： | 本文受国家计划项目(SinoProbe-05-07)、创新研究群体科学基金项目(40921001)、国家青年自然科学基金项目(41002076)、中国地质科学院地质研究所基本科研业务费(J0919)和地调项目(1212011121275)联合资助. |
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| 摘 要： | 对西藏雅江缝合带中的罗布莎-泽当蛇绿岩体进行了详细的野外构造考察和室内组构研究工作,查明了蛇绿岩体的产出特征及与不同围岩的接触关系,确定了两条围限岩体的大型逆冲型韧性剪切带(DFT和DFR)的性质,识别出蛇绿岩侵位过程中经历过早期由北而南仰冲和晚期由南而北倒转推覆两期构造运动,指出两条控制岩体的大型韧性断层非同时形成,不是MCT的反冲断层,提出研究区蛇绿岩侵位新的演化模式,为蛇绿岩侵位机制的探讨提供了新的依据.
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| 关 键 词： | 蛇绿岩 构造产出 侵位机制 罗布莎-泽当 雅鲁藏布江缝合带 |
| 收稿时间： | 2011/6/22 0:00:00 |
| 修稿时间： | 2011/9/16 0:00:00 |
Tectonic occurrence and emplacement mechanism of ophiolites from Luobusha-Zedang, Tibet. |
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| LIANG FengHu,XU ZhiQin,BA DengZhu,XU XiangZhen,LIU Fei,XIONG FaHui and JIA Yi.Tectonic occurrence and emplacement mechanism of ophiolites from Luobusha-Zedang, Tibet.[J].Acta Petrologica Sinica,2011,27(11):3255-3268. |
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| Authors: | LIANG FengHu XU ZhiQin BA DengZhu XU XiangZhen LIU Fei XIONG FaHui and JIA Yi |
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| Institution: | State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;Geological Team No. 2, Geology Bureau of Xizang, Lhasa 850007, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China |
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| Abstract: | Detailed field research and fabric studies have been done on the Luobusha-Zedang ophiolite, one of the most typical parts in the Yarlung Zangbo suture, Tibet. Based on the distribution and contact relationships between ophiolite and different strata, two regional ductile shear zones (DFT and DFR) and their properties are confirmed. They are respectively southern and northern main faults limiting ophiolite. During the emplacement of Luobusha-Zedang ophiolite, DFT is identified to have gone through two stage tectonic movements, i.e. obduction from north to south at the initial emplacement stage and overturned thrust from south to north at the later reactive stage. DFT formed much earlier than DFR and they are not thought to be counter thrusts of MCT from Himalaya orogenic belt. Furthermore, we propose a new model for the emplacement evolution of Luobusha-Zedang ophiolite and provide new evidences for the discussion of emplacement mechanism. |
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| Keywords: | Ophiolite Tectonic occurrence Emplacement mechanism Luobusha-Zedang Yarlung-Zangbo Suture |
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