Conjugate margin pattern of the Southwest Sub-basin, South China Sea: insights from deformation structures in the continent-ocean transition zone
Conjugate margin pattern of the Southwest Sub-basin, South China Sea: insights from deformation structures in the continent-ocean transition zone
复制标题
南海西南次盆地共轭边缘格局：来自陆海过渡带变形构造的认识
DOI：
10.1002/gj.2733
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发表时间：
2016
影响因子：
1.8
通讯作者：
Li Jiabiao
中科院分区：
文献类型：
--
作者：
Ding Weiwei;Li Jiabiao
本文利用南海西南次海盆陆-洋过渡带的8个剖面，对典型的岩浆匮乏裂谷系统的共轭裂谷边缘进行了比较。大陆边缘破碎不整合的地质年代表明，南部大陆边缘的礼乐滩和危地与中沙群岛和富庆盆地西部相连，在西南次盆地打开后经历了西北-东南方向的运动。详细的解释确定了有或没有刚性块体的大陆-海洋过渡带的一系列变形和沉积特征。在由共轭边缘的刚性块（如中沙群岛和芦苇滩）形成的凸形区域内的过渡区或由刚性块夹在中间的凹形区域内，出现了显著的结构相似性。中沙群岛和礼乐滩等刚性构造块体在大陆-海洋边界的形成和大陆的初始分裂中都起了重要作用。版权所有©2015 John Wiley & Sons， Ltd
Eight cross‐sections from the continent‐ocean transition zone of the Southwest Sub‐basin, South China Sea, have been used to compare conjugate rifted margins that are typical of magma‐poor rift systems. The geological timing of the break‐up unconformity in the continental margins shows that the Reed Bank and the Dangerous Grounds in the south continental margin connect with the Zhongsha Islands and the western Phu Khanh Basin, which experienced northwest‐southeast oriented movement after the opening of the Southwest Sub‐basin. Detailed interpretations identify a range of deformational and sedimentary features in the continent‐ocean transition zones with and without rigid blocks. Remarkable structural similarities appear in the transition zone lying within the convex‐shaped area shaped by rigid blocks of the conjugate margin (e.g. the Zhongsha Islands and the Reed Bank) or within concave‐shaped areas sandwiched by rigid blocks. Rigid tectonic blocks such as the Zhongsha Islands and the Reed Bank played important roles in both the shaping of the continent‐ocean boundary and the initial continental break‐up. Copyright © 2015 John Wiley & Sons, Ltd.