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Application of General Shear Theory to the Study of Formation Mechanism of the Metamorphic Core Complex:A Case Study of Xiaoqinling in Central China
Authors:ZHANG Jinjiang Institute of Geology  Chinese Academy of Sciences  POBox  Beijing ZHENG Yadong and LIU Shuwen
Institution:ZHANG Jinjiang Institute of Geology,Chinese Academy of Sciences,P.O.Box,Beijing ZHENG Yadong and LIU Shuwen Department of Geology,Peking University,Beijing
Abstract:The kinematic vorticity number and strain of the mylonitic zone related to the detachment fault increase from ESE to WNW along the moving direction of the upper plate of the Xiaoqinling metamorphic core complex (XMCC) and the geometry of quartz c-axis fabrics changes progressively from crossed girdles to single girdles in the same direction. Therefore, pure shear is dominant in the ESE part of the XMCC while simple shear becomes increasingly important towards WNW. However, the shear type does not change with the strain across the shear zone, thus the variation of shear type is of significance in indicating the formation mechanism. The granitic plutons within the XMCC came from the deep source and their emplacement was an active and forceful upwelling prior to the detachment faulting. The PTt path demonstrates that magmatism is an important cause for the formation of the XMCC. The formation mechanism of the XMCC is supposed to be active plutonism and passive detachment. Crustal thickening and magmatic doming caused necking extension with pure shear, and magmatic heating and doming resulted in detachment extension with simple shear and formed the XMCC.
Keywords:Xiaoqinling Metamorphic Core Complex (XMCC)  formation mechanism  shear type  magmatism  PTt path
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