| The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics |
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| 作者姓名： | Xu Zhiqin Xu Huifen Zhang Jianxin Li Haibing Zhu Zhizhi Qu Jingchuan Institute of Geology Chinese Academy of Geological Sciences BeijingChen Daizhang Chen Jinlu China University of Geosciences Beijingand Yang KaichunNo. Q ilian Geological Party Bureau of Geology and Mineral Resources of Q inghai Province Q ilian County Q inghai |
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| 作者单位： | Xu Zhiqin，Xu Huifen，Zhang Jianxin，Li Haibing，Zhu Zhizhi，Qu Jingchuan，Institute of Geology，Chinese Academy of Geological Sciences，BeijingChen Daizhang，Chen Jinlu，China University of Geosciences，Beijingand Yang KaichunNo. 2 Q ilian Geological Party，Bureau of Geology and Mineral Resources of Q inghai Province，Q ilian County，Q inghai |
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| 基金项目： | This research is a project (No. 4870127)supported by the National Natural Science Foundation of China |
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| 摘 要： | The front of the Zoulang Nanshan Caledonian volcanic island arc zone in the northern Qilian Mountains is a forearc accretionary terrane, composed of multiple accretionary volcanic island arcs, flysch accretionary wedges,high-pressure metamorphosed detachment zones and remnants of ophiolites. It resulted from the northeastward subduction of the Early Palaeozoic Qilan oceanic crust beneath the Alxa block. High-pressure metamorphism, which occurred during the subduction, progressed through three stages: the initial stage of medium T-high P,the main stage of temperature decrease and pressure increase, and the lag stage of pressure decrease and temperature increase. Finally the paper presents a retrotrench subduction dynamic model indicative of northward subduction of the central Qilian block and southward accretion of the Alxa block during the period of 450-500 Ma.
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The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics |
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| Authors: | Xu Zhiqin Xu Huifen Zhang Jianxin Li Haibing Zhu Zhizhi Qu Jingchuan |
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| Institution: | Xu Zhiqin,Xu Huifen,Zhang Jianxin,Li Haibing,Zhu Zhizhi,Qu Jingchuan,Institute of Geology,Chinese Academy of Geological Sciences,BeijingChen Daizhang,Chen Jinlu,China University of Geosciences,Beijingand Yang KaichunNo. Q ilian Geological Party,Bureau of Geology and Mineral Resources of Q inghai Province,Q ilian County,Q inghai |
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| Abstract: | The front of the Zoulang Nanshan Caledonian volcanic island arc zone in the northern Qilian Mountains is a forearc accretionary terrane, composed of multiple accretionary volcanic island arcs, flysch accretionary wedges,high-pressure metamorphosed detachment zones and remnants of ophiolites. It resulted from the northeastward subduction of the Early Palaeozoic Qilan oceanic crust beneath the Alxa block. High-pressure metamorphism, which occurred during the subduction, progressed through three stages: the initial stage of medium T-high P,the main stage of temperature decrease and pressure increase, and the lag stage of pressure decrease and temperature increase. Finally the paper presents a retrotrench subduction dynamic model indicative of northward subduction of the central Qilian block and southward accretion of the Alxa block during the period of 450-500 Ma. |
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| Keywords: | subduction complex accretionary terrane multiple structure retrotrench subduction dynamics |
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