The role of rifting in the development of the continental margins of the southwest sub-basin, South China Sea: Insight from an OBS experiment
The role of rifting in the development of the continental margins of the southwest sub-basin, South China Sea: Insight from an OBS experiment
复制标题
裂谷在南海西南次盆地大陆边缘发育中的作用：来自 OBS 实验的见解
DOI：
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发表时间：
2017
影响因子：
1.4
通讯作者：
Xuelin Qiu
中科院分区：
文献类型：
--
作者：
Chuanchuan Lv;Tianyao Hao;Jian Lin;Xuelin Qiu
The continental margins of the southwest subbasin in the South China Sea mark a unique transition from multi-stages magma-poor continental rifting to seafloor spreading. We used reflection and refraction profiles across the margins to investigate the rifting process of the crust. Combining with the other seismic profiles acquired earlier, we focused on the comparative geological interpretation from the result of multichannel seismic analysis and wideangle seismic tomography. Our result provides the evidence of upper crustal layer with abundant fractures below the acoustic basement with a P-wave velocity from 4.0 to 5.5 km s-1. It indicates extensive deformation of the brittle crust during the continental rifting and can make a good explanation for the observed extension discrepancy in the rift margins of the South China Sea. The seismic chronostratigraphic result shows the possibility of the intracontinental extension center stayed focused for quite a long time in Eocene. Additionally, our evidence suggested that continental margin of the southwest subbasin had experienced at least three rifting stages and the existence of the rigid blocks is an appropriate explanation to the asymmetric rifting of the South China Sea.
