文献类型：期刊文献

英文题名：Tectonic Evolution Divergences and Their Implications between the Deepwater Areas of the Pearl River Mouth Basin and Qiongdongnan Basin, Northern South China Sea

作者：Xie, Hui[1,3]; Qiu, Ning[2]; Shi, Hongcai[1,3]; Sun, Zhen[2]; Zheng, Jinyun[4]

机构：[1] Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea, Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang, 524088, China; [2] Southern Marine Science and Engineering Guangdong Laboratory [Guangzhou], Key Laboratory of Ocean and Marginal Sea Geology, Sanya Institute of Oceanography, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301/511458, China; [3] Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, 524088, China; [4] Shenzhen Branch of CNOOC Limited, Shenzhen, 518000, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220281424)

语种：英文

外文关键词：Gems - Rivers - Sedimentation - Sedimentology - Strike-slip faults - Structural geology - Thermal plumes

外文摘要：The tectonic evolution divergences from west to east along the northern margin of the South China Sea (SCS) are closely related to its formation but are still ambiguous. We focus our study on the tectonic evolution characteristics of the Pearl River Mouth Basin (PRMB) and the Qiangdongnan Basin (QDNB) to reveal the divergences between the western and eastern segments. The back-stripping method and gravity modeling were employed based on drilling wells and geophysical data. We revealed that the crustal structure of the PRMB had a wedge shape, thinning monotonously from the coastline to the continent ocean transition (COT), while that of the QDNB had a symmetrical shape, thinning intensively in the Central Canyon. The characteristics of multi-episodic sedimentation and tectonic evolution were revealed in the PRMB, whose rapid subsidence rates roughly synchronized with the decrease in the seafloor spreading rate. However, the sedimentary and subsidence rate curves mainly featured both accelerated sedimentation and subsidence in the western QDNB and an accelerated subsidence rate curve but a slow sedimentation rate curve in the eastern QDNB after 11.6 Ma. Some low-velocity conduits, which might be the crustal magmatic footprints of the Hainan mantle plume, were revealed in the middle and eastern QDNB. One possible dynamic model that can cause accelerated subsidence after 11.6 Ma in the eastern QDNB is that the Hainan mantle plume moved northwestward and was derived from the contemporaneous dextral strike-slip motion of the Red River Fault. This conjecture coincides with magmatism and subsidence rate variations in the northwestern margin and is evidenced by the low-velocity conduits in the eastern QDNB. ? 2022, The Authors. All rights reserved.