Formation and evolution of the South China Sea since the Late Mesozoic: A review
Xue-jie Li , Zhe Wang , Yong-jian Yao , Hong-fang Gao , Song Zhu , Zi-ying Xu
China Geology ›› 2023, Vol. 6 ›› Issue (1) : 154 -167.
The existing genetic models of the South China Sea (SCS) include an extrusion model of the Indochina Peninsula, a back-arc extension model, and a subduction and dragging model of the Proto-South China Sea (PSCS). However, none of these models has been universally accepted because they do not fully match a large number of geological phenomena and facts. By examining the regional tectonics and integrating them with measured data for the SCS, in this study, a back-arc spreading-sinistral shear model is proposed. It is suggested that the SCS is a back-arc basin formed by northward subduction of the PSCS and its formation was triggered by left-lateral strike-slip motion due to the northward drift of the Philippine Sea Plate. The left-lateral strike-slip fault on the western margin caused by the Indo-Eurasian collision changed the direction of the Southwest Sub-basin’s spreading axis from nearly E-W to NE-SW, and subduction retreat caused the spreading ridge to jump southward. This study summarizes the evolution of the SCS and adjacent regions since the Late Mesozoic.
Proto-South China Sea / Neotethys / Back-arc extension / Sinistral strike-slip / Marine geological survey engineering / South China Sea
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