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首页> 外文期刊>Journal of Asian earth sciences >From dextral contraction to sinistral extension of intracontinental transform structures in the Yanshan and northern Taihang Mountain belts during Early Cretaceous: Implications to the destruction of the North China Craton
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From dextral contraction to sinistral extension of intracontinental transform structures in the Yanshan and northern Taihang Mountain belts during Early Cretaceous: Implications to the destruction of the North China Craton

机译：从早白垩世燕山和太行山北部带的大陆内转换结构的右旋收缩到左旋延伸：对华北克拉通破坏的启示

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摘要

Mesozoic tectonics of the North China Craton (NCC) is characterized by craton modification and destruction that resulted in varied degrees of craton instability. The change from the end of the latest modification to the start of the final destruction of the NCC is regarded to be related to the subduction and roll-back of the Izanagi plate. However, the timing of this tectonic transition remains debated, and the extent of the area where cratonic destruction occurred is still poorly constrained. The joint part of the Yanshan and Taihang Mountain belts has been viewed as the northwest margin of the destructed eastern NCC. Detailed geological mapping and geochronological studies of this area reveal two groups of transform structures: (1) the dextral transform structures developed before 143 Ma and (2) the sinistral transform structures formed after 129 Ma. The western boundary of the dextral transform structures separate the intact NCC and the modified NCC, whereas the sinistral transform structures define the northwestern and northern boundaries of the destructed NCC. The switching from dextral to sinistral movement occurred at ca. 143-129 Ma, which is roughly coeval with the initial volcanism of the Zhangjiakou Formation, whose age becomes younger eastward. The western boundary of the sinistral transform structures migrated to the east for more than 120 km with respect to that of the dextral transform structures. These indicate that the transition from the end of the latest modification to the start of the final destruction of the NCC occurred in 143-129 Ma. In regional geology, this transition is consistent with the geodynamic setting of the transformation from the Late Jurassic flat-slab subduction to slab roll-back of the Izanagi plate since similar to 144 Ma.
机译：华北克拉通（NCC）的中生代构造特征是克拉通变形和破坏，导致克拉通不稳定性程度不同。从最新修改的结束到NCC的最终销毁开始之间的变化被认为与Izanagi板块的俯冲和后退有关。但是，这种构造转变的时间仍存在争议，克拉通破坏发生的区域范围仍然受限制。燕山和太行山带的连接部分被视为东部NCC破坏的西北边缘。该地区的详细地质制图和地质年代研究揭示了两组转换结构：（1）在143 Ma之前形成的右旋转换结构和（2）在129 Ma之后形成的左弦转换结构。右旋变换结构的西边界将完整的NCC和修改后的NCC分开，而左弦变换结构则定义了被破坏的NCC的西北边界和北边界。从右旋向左旋的转换发生在大约143-129 Ma，大致与张家口组的初始火山作用相吻合，后者的年龄向东变年轻。左旋变换结构的西边界相对于右旋变换结构的西边界向东迁移超过120 km。这些表明从最新修改的结束到NCC的最终破坏开始的过渡发生在143-129 Ma。在区域地质学中，这种过渡与从侏罗纪晚期平板俯冲到Izanagi板的平板回滚转变的地球动力学背景一致，因为它类似于144 Ma。

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