Early Palaeozoic deformation features and tectonic implications in the eastern Jiangnan Orogen, South China: Constraints from structural analysis of north–north‐east ductile shear zones and relevant dating,Geological Journal

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Early Palaeozoic deformation features and tectonic implications in the eastern Jiangnan Orogen, South China: Constraints from structural analysis of north–north‐east ductile shear zones and relevant dating
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-29 , DOI: 10.1002/gj.4009
Jun Hu ₁ , Xinqi Yu ₁ , Mengyan Liu ₁ , Xiu Liu ₁ , Yan Zeng ₁

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The north–north‐east‐trending (NNE) shear zones, which are defined by the Jiekou shear zone and Huangmao shear zone, are located in the eastern Jiangnan Orogen. This article provides kinematics, geochronological data, and dynamics on the Jiekou and Huangmao shear zones and serves as a reference for understanding the tectonic evolution in the South China Block during the Early Palaeozoic orogeny. All shearing signatures show that the Huangmao shear zone is dextral, and the Jiekou shear zone is sinistral. Both shear zones have certain genetic connections. The rocks from the Jiekou and Huangmao shear zones are metamorphosed and deformed into protomylonite and mylonite. Results of the deformation fabrics of feldspar and quartz and quartz c‐axis fabric analysis indicate that the ductile deformation temperatures of the Jiekou shear zone sinistral shearing are ~400–500°C. Dextral shearing with medium–high temperature (450–550°C) is mainly recorded in the Huangmao shear zone. In combination with the previous geochronology, NNE‐trending sinistral and dextral shearing in the eastern Jiangnan Orogen occurred at 465–430 Ma, coeval with the Early Palaeozoic orogeny. Therefore, the geodynamics of the NNE‐trending shear zones is related to a major strain transformation from NW to WNW, which is remotely affected by the intracontinental convergence of Yangtze and Cathaysia blocks during the Early Palaeozoic orogeny.

中文翻译：

华南东部江南造山带的早古生代形变特征和构造意义：东北—东北—东部韧性剪切带的结构分析和相关测年

由界口剪切带和黄ma剪切带定义的北北东向剪切带位于江南造山带东部。本文提供了界口和黄ma剪切带的运动学，年代学数据和动力学，并为了解早古生代造山过程中华南地块的构造演化提供了参考。所有剪切特征均表明，黄ma剪切带为右旋，界口剪切带为左旋。两个剪切带都有一定的遗传联系。界口和黄ma剪切带的岩石变质，变形为原隆起石和my柱石。长石和石英和石英的变形织物的结果Ç轴织物分析表明，界口剪切带左旋剪切的塑性变形温度为〜400–500°C。中高温（450-550°C）的右旋剪切主要记录在黄Huang剪切带。结合先前的地质年代学，江南造山带东部的北北东向左旋和右旋剪切发生在465-430 Ma，与早古生代造山运动同时期。因此，NNE趋势剪切带的地球动力学与从NW到WNW的主要应变转变有关，这在早古生代造山运动中受到长江和华夏块体的陆内汇聚作用的远程影响。

更新日期：2020-09-29

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