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

FU Jie; LI Ming-bi; TANG Yong; QIU Wen-xian; WANG Hui

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Journal of Marine Sciences ›› 2013, Vol. 31 ›› Issue (1) : 1-15.

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

FU Jie^1,2,3, LI Ming-bi¹, TANG Yong^1,2, QIU Wen-xian^1,4, WANG Hui⁵

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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.

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Baiyun Sag / anomaly post-rift subsidence / backstripping modeling / subsidence analysis / South China Sea

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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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