Gravity-Seismic Joint Inversion of Lithospheric Density Structure in the Qiongdongnan Basin, Northwest South China Sea
文献类型：期刊论文
| 作者 | Li, Chaoyang1,4,5; Gong, Wei2,3; Zhao, Lihong1; Li, Zhonghua1; Zhi, Pengyao1; Ge, Jiayu1 |
| 刊名 | LITHOSPHERE
 |
| 出版日期 | 2024 |
| 卷号 | 2024期号:1页码:13 |
| ISSN号 | 1941-8264 |
| DOI | 10.2113/2024/lithosphere_2023_124 |
| 通讯作者 | Zhao, Lihong(zhaolihong@sdust.edu.cn) |
| 英文摘要 | 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. |
| WOS关键词 | CONTINENT-OCEAN TRANSITION ; RIFTING-BREAKUP PROCESS ; NORTHERN MARGIN ; CRUSTAL STRUCTURE ; XISHA TROUGH ; HEAT-FLOW ; MAGMATISM ; EXTENSION ; EVOLUTION ; SUBSIDENCE |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:001205894800003 |
| 出版者 | GEOSCIENCEWORLD |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/185683]  |
| 专题 | 海洋研究所_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.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Shandong, Peoples R China 3.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Shandong, Peoples R China 4.Minist Nat Resources, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China |
| 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. |
入库方式： OAI收割
来源：海洋研究所
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