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Quantifying Postrift Lower Crustal Flow in the Northern Margin of the South China Sea

文献类型：期刊论文

作者Dong, Miao4,5; Zhang, Jian5; Brune, Sascha2,3; Wu, Shiguo4,5; Fang, Gui5; Yu, Lei1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2020-02-01
卷号125期号:2页码:14
ISSN号2169-9313
DOI10.1029/2019JB018910
英文摘要Postrift subsidence of sedimentary basins in the northern margin of the South China Sea exceeds more than 2,.000 m, which points toward anomalous postrift crustal deformation. Previous studies have proposed lower crustal flow to explain this observation; however, this hypothesis has never been confirmed quantitatively. Here, we calculate the initial crustal structure and thermal lithospheric thickness of the northern margin of the South China Sea on the basis of recently measured heat flow data, tectonic subsidence curves, and present-day crustal structure. Crustal thinning processes during rifting and reduced thickness of the lower crust in the postrift are also calculated by the strain rate inversion method and thermal isostasy. Our results show that the initial (Early Cenozoic) crustal thickness of the northern margin of the South China Sea varies between 27.7 and 36.3 km, and the average proportion of the lower crust is 67%. The initial thermal lithospheric thicknesses decrease from similar to 118 to similar to 81 km from the shelf to the sea, which indicates that the offshore margin has high temperatures and low strength and is more easily stretched and deformed. The average stretching factor the margin during rifting is 1.24. The lower crust reduces in thickness during the postrift phase by values between 1 and 11 km, which increases gradually from the shelf to deep water. We suggest that the thicker weak crust and hot lithospheric structure therefore make positive contribution to the lower crustal flow, the direction of which is from the oceanic basin to the shelf.
WOS关键词CONTINENTAL BREAK-UP ; EXTENSION DISCREPANCY ; HEAT-FLOW ; ANOMALOUS SUBSIDENCE ; QIONGDONGNAN BASIN ; RIFTED MARGINS ; EVOLUTION ; MODEL ; DEFORMATION ; LITHOSPHERE
资助项目NSFC-Guangdong Joint Foundation[U1701245] ; National Natural Science Foundation of China[41906056] ; National Natural Science Foundation of China[91858212] ; China Postdoctoral Science Foundation ; University of Chinese Academy of Sciences
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000530895200067
出版者AMER GEOPHYSICAL UNION
资助机构NSFC-Guangdong Joint Foundation ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; University of Chinese Academy of Sciences
源URL[http://ir.idsse.ac.cn/handle/183446/7582]  
专题深海科学研究部_深海地球物理与资源研究室
通讯作者Zhang, Jian; Yu, Lei
作者单位1.Linyi Univ, Coll Resources & Environm, Shandong Prov Key Lab Water & Soil Conservat & En, Linyi, Shandong, Peoples R China
2.Univ Potsdam, Inst Geosci, Potsdam, Germany
3.GFZ German Res Ctr Geosci, Geodynam Modelling Sect, Potsdam, Germany
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Dong, Miao,Zhang, Jian,Brune, Sascha,et al. Quantifying Postrift Lower Crustal Flow in the Northern Margin of the South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(2):14.
APA Dong, Miao,Zhang, Jian,Brune, Sascha,Wu, Shiguo,Fang, Gui,&Yu, Lei.(2020).Quantifying Postrift Lower Crustal Flow in the Northern Margin of the South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(2),14.
MLA Dong, Miao,et al."Quantifying Postrift Lower Crustal Flow in the Northern Margin of the South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.2(2020):14.

入库方式： OAI收割

来源：深海科学与工程研究所

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