The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics |
| |
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 |
| |
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 |
| |
基金项目: | This research is a project (No. 4870127)supported by the National Natural Science Foundation of China |
| |
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.
|
The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics |
| |
Authors: | Xu Zhiqin Xu Huifen Zhang Jianxin Li Haibing Zhu Zhizhi Qu Jingchuan |
| |
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 |
| |
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. |
| |
Keywords: | subduction complex accretionary terrane multiple structure retrotrench subduction dynamics |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |