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《Acta Geologica Sinica》 1994-01
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THE ZHOULANGNANSHAN CALEDONIAN SUBDUCTIVE COMPLEX IN THE NORTHERN QILIAN MOUNTAINS AND ITS DYNAMICS

Xu Zhiqin, Xu Huifeng, Zhang Jianxin, Li Haibing, Zhu Zhizhi, Qu Jingchuan,(Institute of Geology, CAGS, Beijing)Chen Daizhang, Chen Jinlu,(China University of Geosciences, Beijing)and Yang Kaichun(No. 2 Geological Party, Bureau of Geology and Mineral Resources of Qinghai Province)  
The Caledonian orogenic belt of the Northern Qilian Mountains may be divided into the following eight tectonic units: (1) Tulaishan ophiolite zone, (2) Zhou-langnanshan subduction complex accretionary terrane, (3) Zhoulangnanshan volcanic island arc zone, (4) Zhoulangnanshan north slope back-arc basin, (5) Silurian remnant sea basin, (6) Devonian molasse basins, (7) Post-Devonian superimposed basin, and (8) Jintieshan nappe.The Zhoulangnanshan Caledonian subductive complex accretionary terrane with the characteristics of plate convergence and complicated constitutions is a high-strain zone composed of poly-volcanic island arcs, fore-arc flysch accretionary wedges, glau-cophane schists and ophiolitic melange zone. Its deformation mechanism is predominantly "simple shear" and the sense of shear is from NE to SW. The metamorphism related to subduction is as follows: the first phase (M1): low T/low P greenschist-facies metamorphism; the second phase (M2): low T/high P blueschist-facies metamorphism and the third phase (M3): retrogressive low T/low P greenschist-facies metamorphism. The high-pressure metamorphism (M2), which occurred during subduction, underwent medium T/high P metamorphism of the initial stage, cooling/progressive compression of the main stage and heating/decompression of the lag stage. Finally, a "retrotrench" subduction dynamic model characterized by the northward subduction of the central Qilian plate and the southward accretion of the Alxa plate during 450Ma-500Ma is presented in this paper.
【Fund】: 国家自然科学基金(批准号:4870127)
【CateGory Index】: P542
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