Mesozoic to Cenozoic intracontinental deformation and dynamics of the North China Craton
Mesozoic to Cenozoic intracontinental deformation and dynamics of the North China Craton
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DOI：
10.1002/gj.2500
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发表时间：
2013-09
影响因子：
1.8
通讯作者：
S. Z. Li;Y. Suo;M. Santosh;L. Dai;X. Liu;S. Yu;S. Zhao;C. Jin
中科院分区：
文献类型：
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作者：
S. Z. Li;Y. Suo;M. Santosh;L. Dai;X. Liu;S. Yu;S. Zhao;C. Jin
自中生代以来，华北克拉通一直处于一个被俯冲带或碰撞带包围的三角形交界处。因此，这个克拉通标志着一个超收敛状态的边界。在超收敛构造域中，位于华北克拉通东部的中新生代渤海湾盆地具有明显的伸展作用。在这一综合中，我们重点研究了华北克拉通中新生代的陆内动力学。层析成像显示，华北克拉通东、西地块的深部构造存在显著差异，而两地区的浅层构造均具有超收敛的特征。渤海湾盆地在华北克拉通破坏期间发育的构造情景主要以中生代挤压和新生代北西向的地壳内伸展和拉裂为特征。新生代深部过程主要是由印度-欧亚板块碰撞引起的西部构造域下软流圈的区域性远场向东上涌，同时伴随着太平洋板块的东跳和俯冲。渤海湾盆地中生代深部作用为局部拆沉和岩浆底镀。我们的研究强调了在全球最大的超收敛系统之一的前沿发育的对比构造和构造特征。版权所有©2013 John Wiley & Sons， Ltd
Since the Mesozoic, the North China Craton has been located at a triangular junction surrounded by subduction or collision zones. This craton thus marks the frontier of a super‐convergent regime. Within the super‐convergence tectonic domains, however, distinct extensional regimes operated in the Meso‐Cenozoic Bohai Bay Basin located at the eastern part of the North China Craton. In this synthesis, we focus on the intracontinental dynamics during the Mesozoic to Cenozoic in the North China Craton. Whereas the deep structures as revealed from tomographic studies show a remarkable difference between the Western and Eastern blocks of the North China Craton, the shallow setting in both regions is characterized by super‐convergence. We propose here that the tectonic scenario of the Bohai Bay Basin developed during the destruction of the North China Craton is largely characterized by Mesozoic extrusion and Cenozoic NW‐directed intracrustal extension with pull‐apart. The Cenozoic deep process is mainly a regional far‐field eastward upwelling of the asthenosphere beneath the western tectonic domain due to the India–Eurasia Plate collision accompanied by the eastward jump and rollback of the subducting Pacific Plate. The deep processes under the Bohai Bay Basin in the Mesozoic are local delamination and magma underplating. Our study highlights the contrasting structural and tectonic signature developed in the frontier of one of the largest super‐convergent systems on the globe. Copyright © 2013 John Wiley & Sons, Ltd.