Post-rift subsidence anomaly and its mechanism in the Baiyun Sag, Pearl River Mouth Basin

Abstract

Abstract: Post-rift subsiding anomalies have been discovered in many basins in the northern continental margin of South China Sea, of which Baiyun Sag is a typical one. We used software Temis Suite 2007 to build the backstripping model of three NNW—SEE-oriented seismic profiles crossing the Baiyun Sag, and analyzed the post-rift subsidence. The results show that the Baiyun Sag experienced anomalous post-rift subsidence. Compared with the Mckenzie's classic port-rift subsidence model, the Main Baiyun Sag subsided over 2.6 km deeper and the Southern Baiyun Sag subsided nearly 2 km. An accelerated subsidence stage could be conducted during 16.5~10.5 Ma, which might relate to the end of sea-floor spreading in the South China Sea. The ductile extension and extreme quick and thick deposition in the Baiyun Sag indicate that the lower-crustal flow might have been the mechanism for the anomaly subsidence.

Key words: Baiyun Sag, anomaly post-rift subsidence, backstripping modeling, subsidence analysis, South China Sea

CLC Number:

P736.15

FU Jie, LI Ming-bi, TANG Yong, QIU Wen-xian, WANG Hui. Post-rift subsidence anomaly and its mechanism in the Baiyun Sag, Pearl River Mouth Basin[J]. Journal of Marine Sciences, 2013, 31(1): 1-15.

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