文献类型：期刊文献

英文题名：Lithospheric stretching-style variations and anomalous post-rift subsidence in the deep water sub-basins of the Pearl River Mouth Basin, northern South China Sea

作者：Xie, Hui[1,2];Zhou, Di[2];Shi, Hongcai[1];Kong, Deming[1];Li, Yuanping[3];Li, Fucheng[2];Cao, Jinghe[2]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[2]Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China;[3]China Natl Offshore Oil Corp, Shenzhen Branch, Inst Sci & Technol, Shenzhen 518054, Peoples R China

年份：2021

卷号：131

外文期刊名：MARINE AND PETROLEUM GEOLOGY

收录：SCI-EXPANDED(收录号：WOS:000671184300002)、、EI(收录号：20212310471031)、Scopus(收录号：2-s2.0-85107274598)、WOS

基金：We are grateful to the CNOOC Shenzhen Branch in China for providing the data set. We thank Badley Geoscience Ltd. and Alan Roberts for help with 2D inverse and forward modeling. We also thank section editor Tiago Alves and two reviewers (Chris Morley and another anonymous reviewer) for their careful review which are of great help for the improvement of our paper. This work was jointly supported by the National Natural Science Foundation of China (No. 41606065) , Guangdong Natural Science Foundation of China (No. 2016A030310331) , Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences (No. MSGL1502) , and the Program for Scientific Research Startup Funds of Guangdong Ocean University and Marine Science Research Team Project of Guangdong Ocean University (002026002004) .

语种：英文

外文关键词：Lithospheric stretching; Anomalous subsidence; Deep water sub-basins; Pearl River Mouth Basin; Northern South China Sea

外文摘要：The stretching and subsidence characteristics of passive continental margins have been investigated for decades but are still controversial. We focused our study on the deep water sub-basins of the Pearl River Mouth Basin in the northern South China Sea, the only well-preserved passive margin in the South China Sea. Inverse modeling and forward modeling based on a flexural cantilever model were employed. The stretching factors of the upper crust, lower crust, whole crust, and mantle lithosphere were mapped, and the anomalous post-rift subsidence was isolated from the McKenzie model. The Liwan Sub-basin showed highly depth-dependent stretching that significantly increased with depth. The stretching factor of the lower crust in the center of the Baiyun Sub-basin was higher than that of the mantle lithosphere. Two significant anomalous rapid subsidence events were revealed. The 23.03-19.8 Ma event was characterized by anomalous subsidence at the center, located in the southern Baiyun Sub-basin, with a maximum value in excess of 1200 m. Strong negative P-wave abnormal and magma addition may indicated an upwelling mantle under the Baiyun Sub-basin around 23 Ma. We suggest that the 23.6 Ma southward ridge jump in the South China Sea could have weakened or eliminated the mantle upwelling under the Baiyun Sub-basin and caused rapid subsidence at 23.03-19.8 Ma. The 14.3-11.9 Ma event was characterized by a subsidence zone orientated northeast along the Baiyun Sub-basin, with a maximum value in excess of 600 m. We propose that rapid depositional sediment during this period would have driven the lower crustal flow away from the Baiyun Sub-basin center, causing rapid vertical subsidence and leading to the stretching factor of the lower crust being higher than that of the mantle lithosphere.