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New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model

文献类型：期刊论文

作者Zhang, Jiazheng6; Zhao, Minghui5,6; Ding, Weiwei4; Ranero, Cesar R.2,3; Sallares, Valenti3; Gao, Jinwei1; Zhang, Cuimei6; Qiu, Xuelin5,6
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2023-04-01
卷号128期号:4页码:21
关键词three-dimensional (3D) ocean bottom seismometer controlled-source rift-to-drift process northern South China Sea
ISSN号2169-9313
DOI10.1029/2022JB026171
通讯作者Zhang, Jiazheng(jzzhang@scsio.ac.cn) ; Zhao, Minghui(mhzhao@scsio.ac.cn)
英文摘要A three-dimensional (3D) P-wave seismic velocity (Vp) model of the crust in the northern South China Sea margin drilled by IODP Expeditions 367/368/368X has been obtained with first-arrival travel-time tomography using wide-angle seismic data from a network of 49 OBSs and 11 air-gun shot lines. The 3D Vp distribution constrains the extent, structure and nature of the continental, continent to ocean transition (COT), and oceanic domains. Continental crust laterally ranges in thickness from similar to 8 to 20 km, a similar to 20 km-width COT contains no evidence of exhumed mantle, and crust with clear oceanic seismic structure ranges in thickness from similar to 4.5 to 9 km. A high-velocity (7.0-7.5 km/s) lower crust (HVLC) ranges in thickness from similar to 1 to 9 km across the continental and COT domains, which is interpreted as a proxy of syn-rift and syn-breakup magma associated to underplating and/or intrusions. Continental crust thinning style is abrupter in the NE segment and gradual in the SW segment. Abrupter continental thinning exhibits thicker HVLC at stretching factor (beta) < similar to 3, whereas gentler thinning associates to thinner HVLC at beta > similar to 4. Opening of the NE segment thus occurred by comparatively increased magmatism, whereas tectonic extension was more important in the SW segment. The Vp distribution shows the changes in deformation and magmatism are abrupt along the strike of the margin, with the segments possibly bounded by a transfer fault system. No conventional model explains the structure and segmentation of tectonic and magmatic processes. Local inherited lithospheric heterogeneities during rifting may have modulated the contrasting opening styles. Plain Language Summary Rapid transition from continent to ocean at the northern South China Sea has been found by IODP Expeditions 367/368/368X through seven drilling sites, but where and how the transition occurred along the strike of the rifted margin is still debated. A three-dimensional (3D) P-wave seismic velocity (Vp) model is therefore constructed with first-arrival travel-time tomography using wide-angle seismic data from a network of 49 OBSs and 11 air-gun shot lines. In combination with other geophysical and geological data, we reveal the geometry of a comparatively narrow continent to ocean transition zone of similar to 20 km in width and the significant along-strike variation in the continental crust thinning style and magma generation. Furthermore, a transfer fault system has been inferred to possibly separate the NE tectono-magmatic segment from the SW tectonic-dominated segment. The segmentation in tectonic and magmatic domains supports that local inherited lithospheric heterogeneities may have led to the different opening styles during rift-to-drift process.
WOS关键词OCEAN-CONTINENT TRANSITION ; CRUSTAL STRUCTURE ; MAGMATISM ; EVOLUTION ; EXTENSION ; REFRACTION ; ATLANTIC ; BREAKUP ; BOUNDARY ; MANTLE
资助项目National Natural Science Foundation of China[41730532] ; National Natural Science Foundation of China[91958212] ; National Natural Science Foundation of China[U20A20100]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:001022783200021
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China
源URL[http://ir.idsse.ac.cn/handle/183446/10417]  
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, Jiazheng; Zhao, Minghui
作者单位1.Chinese Acad Sci, Inst Deep sea Sci & Engn, Lab Marine Geophys & Deep Sea Georesource, Sanya, Peoples R China
2.ICREA, Barcelona, Spain
3.Inst Ciencies Mar ICM CSIC, Barcelona Ctr Subsurface Imaging, Barcelona, Spain
4.Minist Nat Resources, Inst Oceanog 2, State Ocean Adm, Key Lab Submarine Geosci, Hangzhou, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Jiazheng,Zhao, Minghui,Ding, Weiwei,et al. New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(4):21.
APA Zhang, Jiazheng.,Zhao, Minghui.,Ding, Weiwei.,Ranero, Cesar R..,Sallares, Valenti.,...&Qiu, Xuelin.(2023).New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(4),21.
MLA Zhang, Jiazheng,et al."New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.4(2023):21.

入库方式： OAI收割

来源：深海科学与工程研究所

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