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首页> 外文期刊>Journal of Asian earth sciences >Neoproterozoic to Early Paleozoic polyorogenic deformation in the southeastern margin of the Yangtze Block: Constraints from structural analysis and ~(40)Ar/~(39)Ar geochronology
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Neoproterozoic to Early Paleozoic polyorogenic deformation in the southeastern margin of the Yangtze Block: Constraints from structural analysis and ~(40)Ar/~(39)Ar geochronology

机译：扬子地块东南缘的新元古代至早古生代多造山变形：来自结构分析和〜（40）Ar /〜（39）Ar地质年代学的约束

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摘要

The southeastern margin of the Yangtze Block is a suitable region to decipher Neoproterozoic to Early Paleozoic polyorogenic deformation of the South China Block. Based on l:50,000-scale geological mapping, four deformational phases were identified through structural analysis and ~(40)Ar/~(39)Ar dating. The earliest event (D_1) corresponds to nearly E-W-striking folding and top-to-the south thrusting, developed during Neoproterozoic orogeny caused by the collision between the Yangtze Block and the Cathaysia Block. The D_2 event is characterized by the nearly E-W-striking top-to-the north thrusting. The D_3 deformation is marked by the NNE-striking folding, thrusting and dextral shearing. The D_3 structures constitute a positive flower pattern, with opposing kinematics, rooted in the Jiangwan dextral shear zone. The D_4 event is the nearly E-W-striking ductile dextral shearing. ~(40)Ar/~(39)Ar geochronology shows that the NNE-trending dextral shearing and the nearly E-W-striking dextral shearing occurred at 449 ± 4 Ma and 429 ± 3 Ma, respectively. Combining with previous geochronology, all the D_2, D_3, D_4 events are related to the Early Paleozoic orogeny. Both the D_2 top-to-the north thrusts and D_3 NNE-striking positive flower structures are syn-orogenic products. These incompatible syn-orogenic structures indicate that the orientation of the principal stress changed from the N-S-striking to E-W-striking at ～450 Ma. The nearly E-W-striking ductile dextral shearing (D_4) is the outcome of post-orogeny.
机译：扬子地块的东南缘是一个合适的地区，可以将华南地块的新元古代到早古生代多造山变形解读。基于l：50,000规模的地质图，通过结构分析和〜（40）Ar /〜（39）Ar测年确定了四个变形相。最早的事件（D_1）对应于扬子地块与华夏地块碰撞引起的新元古代造山运动期间发生的近乎E-W的褶皱和自上而下的南冲。 D_2事件的特征是从上到北的近乎E-W的撞击。 D_3变形的特征是NNE明显的折叠，推力和右旋剪切。 D_3结构构成正花型，运动学相反，植根于江湾右旋剪切带。 D_4事件是近乎E-W冲击的延性右旋剪切。 〜（40）Ar /〜（39）Ar地质年代学表明，NNE向右旋剪切和近E-W向右旋剪切发生在449±4 Ma和429±3 Ma。结合以前的年代学，所有的D_2，D_3，D_4事件都与早古生代造山运动有关。 D_2从上到北的逆冲和D_3 NNE撞击的正花结构都是同造山作用的产物。这些不相容的同造山构造表明，主应力的方向在〜450 Ma时从N-S向变为E-W向。造山运动后的结果是近乎E-W冲击的韧性右旋剪切（D_4）。

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