earticle

영어

The west margin fault zone of the South China Sea is a tensional basement fault in the extended segment of the Indosinian Subplate toward the sea. It originally formed in the Mesozoic, and reactivated and developed further in the Cenozoic. It is not appropriate to regard this fault as a regional tectonic line between the Indosinian Subplate and the South China Sea Subplate because it does not exhibit the basic features of a regional boundary fault. A zone of gravity and magnetic anomalies in the southwest subbasin of the South China Sea extends westwards to the Zhongjian Island-Guangya Reef arcuate fault zone, and is the real regional tectonic line between the Indosinian Subplate and South China Sea Subplate. The formation of this basement tectonic framework might be closely associated with tectonic evolution of the ancient arc-trench system from the Proterozoic to the Mesozoic. The major faults are the south margin fault zone of the Qiongdongnan-Shenhu-Dongsha massif, the Red River fault zone, and the Zhongjian Island-Guangya Reef arcuate fault zone, which construct the basement tectonic framework of the South China Subplate, the Indosinian Subplate, and the South China Sea Subplate, and control the development and evolution of basement tectonics.