Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea

doi:10.2113/2024/lithosphere_2023_124

IOCAS-IR > 海洋地质与环境重点实验室

	Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea
	Li, Chaoyang 1,2,3; Gong, Wei 4,5; Zhao, Lihong 1; Li, Zhonghua 1; Zhi, Pengyao 1; Ge, Jiayu 1
	2024
发表期刊	LITHOSPHERE
ISSN	1941-8264
卷号	2024 期号:1 页码:13
通讯作者	Zhao, Lihong([email protected])
摘要	Qiongdongnan Basin (QDNB), located at the northwestern corner of the South China Sea (SCS), is a key juncture between the extensional tectonic regime in the northern continental margin and the shear tectonic regime in the western continental margin. Analyzing the crustal density structure and tracking the thermodynamic controlling factors are effective approaches to reveal the nonuniform breakup process of the northwestern SCS. Herein, focusing on the obvious tectonic deformation with distinct eastern and western parts in the QDNB, we present the crustal density structures of five profiles and identify the high -density anomaly related to the synrifting mantle underplating and postrifting magmatic intrusions. The crustal density model was constructed from the Bouguer gravity anomaly, ocean bottom seismic profiles, and multichannel seismic reflection profiles. The northern part of QDNB, with normal crustal density, lower surface heat flow of <55 mW/m(2), and limited extension factor of 1.25-1.70, is recognized as the initial nonuniform extension continental crust. The mantle underplating beneath the QDNB is identified as a high mantle density of 3.30-3.40 g/cm(3) and a high lower crustal density of 2.92-2.96 g/cm(3), which is usually recognized by the high -velocity layers in the northeastern margin of SCS. The magmatic intrusions are identified as the high -density bodies ranging from 3.26 g/cm(3) at the base to 2.64 g/cm3 at the top, which become stronger from the west to east. The central part of Xisha Trough is featured by the cooling of the heavily thinned lower crust in the final continental rifting stage, which is close to the cold and rigid oceanic crust. Lateral variations in the deep magmatic anomaly should be the crucial factor for the nonuniform breakup process in the northwestern margin of SCS.
DOI	10.2113/2024/lithosphere_2023_124
收录类别	SCI
语种	英语
资助项目	Shandong Provincial Natural Science Foundation, China[ZR2022QD087]; National Natural Science Foundation of China[92058213]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2022KG2]; Open Fund of the Key Laboratory of Submarine Geosciences, Ministry of Natural Resources[KLSG2207]
WOS研究方向	Geochemistry & Geophysics ; Geology
WOS类目	Geochemistry & Geophysics ; Geology
WOS记录号	WOS:001205894800003
出版者	GEOSCIENCEWORLD
WOS关键词	CONTINENT-OCEAN TRANSITION ; RIFTING-BREAKUP PROCESS ; NORTHERN MARGIN ; CRUSTAL STRUCTURE ; XISHA TROUGH ; HEAT-FLOW ; MAGMATISM ; EXTENSION ; EVOLUTION ; SUBSIDENCE
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/185684
专题	海洋地质与环境重点实验室
通讯作者	Zhao, Lihong
作者单位	1.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Shandong, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 3.Minist Nat Resources, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 4.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Shandong, Peoples R China 5.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Shandong, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Li, Chaoyang,Gong, Wei,Zhao, Lihong,et al. Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea[J]. LITHOSPHERE,2024,2024(1):13.
APA	Li, Chaoyang,Gong, Wei,Zhao, Lihong,Li, Zhonghua,Zhi, Pengyao,&Ge, Jiayu.(2024).Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea.LITHOSPHERE,2024(1),13.
MLA	Li, Chaoyang,et al."Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea".LITHOSPHERE 2024.1(2024):13.