Refining the model of South China Sea’s tectonic evolution: evidence from Yinggehai-Song Hong and Qiongdongnan Basins
Refining the model of South China Sea’s tectonic evolution: evidence from Yinggehai-Song Hong and Qiongdongnan Basins
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完善南海构造演化模型：来自莺歌海-松洪盆地和琼东南盆地的证据
DOI：
10.1007/s11001-013-9202-8
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发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
Chao Lei
中科院分区：
文献类型：
--
作者：
Weilin Zhu;Chao Lei
莺歌海-宋洪新生代盆地与琼东南新生代盆地共同构成东南亚最大的新生代沉积盆地之一。通过对新发布的区域地震资料的详细研究，发现它们的盆地结构和地层特征有明显的不同。莺歌海-宋洪盆地的北西-南东向伸展构造强烈地受控于红河断裂的走滑活动。基底被红河的沉积物覆盖。然而，在琼东南盆地的地震资料中，却设想了与裂谷作用密切相关的构造。南海北方大陆边缘的这种裂陷和减薄现象，必须用始新世-早中新世期间原南海洋壳向西北婆罗洲陆块俯冲来解释。为了验证莺歌海-宋洪盆地走滑断裂和琼东南盆地裂谷在南海西北角的共同发育，对南海西北角的构造进行了重建，并利用MSC MARC软件对模型进行了检验。数值模拟结果表明，南海及邻区可划分为碰撞挤压构造区和原南海板拉构造区。认为莺歌海-宋洪盆地的近海红河断裂是这两个构造省之间的重要构造边界。
The Cenozoic Yinggehai-Song Hong and Qiongdongnan Basins together form one of the largest Cenozoic sedimentary basins in SE Asia. Detail studying on the newly released regional seismic data, we observed their basin structure and stratigraphy are clearly different. The structure of the NW–SE elongation of the Yinggehai-Song Hong Basin is strongly controlled by the strike–slip faulting of steep Red River Fault. And the basement is covered by heavy sediments from the Red River. However, structures closely related with rifting are imagined on the seismic data from the Qiongdongnan Basin. This rifting and thinning on the northern continental margin of the South China Sea is necessary to be explained by the subduction of a Proto-South China Sea oceanic crust toward the NW Borneo block during the Eocene–Early Miocene. To test how the strike–slip faulting in the Yinggehai-Song Hong Basin and rifting in the Qiongdongnan Basin develop together in the northwest corner of the South China Sea, we reconstructed the tectonics of the northwest corner of the South China Sea and test the model with software of MSC MARC. The numerical model results indicate the South China Sea and its surrounding area can be divided into a collision-extrusion tectonic province and a Proto-South China Sea slab pull tectonic province as suggested in previous works. We suggested that offshore Red River Fault in the Yinggehai-Song Hong Basin is confirmed as a very important tectonic boundary between these two tectonic provinces.
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影响因子：
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作者：
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发表时间：
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期刊：
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DOI：
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发表时间：
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期刊：
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