Mode of Extension During the Xisha Trough Rift in the South China Sea
文献类型：期刊论文
| 作者 | Wang, Wenlong3,5,7; Prada, M.3; Cameselle, A.3; Grevemeyer, I.4; Barckhausen, U.6; Dong, Dongdong2,7; Ranero, C. R.1,3 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2025-07-23 |
| 卷号 | 130期号:7页码:19 |
| 关键词 | P-wave velocity lower crust flow mantle serpentinization Xisha trough South China Sea asymmetric rift structure |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2024JB030564 |
| 通讯作者 | Wang, Wenlong(wenlongwang2020@163.com) ; Ranero, C. R.(cranero@icm.csic.es) |
| 英文摘要 | A seismic transect across the Xisha Trough failed rift provides information on processes active during the opening of the South China Sea (SCS). The rift basement gradually thins at the conjugate flanks from similar to 25 to 15 km toward the central sector, where it abruptly thins to similar to 10-6 km in thickness. The seismic velocity model supports that 6.5 km/s velocity separates an upper from a lower crust layer, where Vp reaches 7.1 km/s above Moho. The upper crust extends across the entire rift, but the lower crust layer does not occur in the thin crust of the central sector, which is underlain by mantle with anomalously low Vp, indicating serpentinization. Changes in tectonic structure mimic the Vp distribution. The rift flanks have comparatively small faults associated to gradual thinning, whereas the central sector has larger faults that possibly reach the mantle. The faulting in the central sector thus indicates whole-crust embrittlement, which possibly led to synrift mantle serpentinization. Despite the weaker rheology, serpentinized mantle did not result in the development of low-angle faulting or continental break-up. Furthermore, the rift overall thinning and faulting structure is asymmetric with respect to the rift center, supporting an initial widespread moderate extension creating the flanks. When extension thinned the crust to <15 km, the whole crust was brittle and deformation first focused and subsequently laterally migrated to create the central sector. The continental Xisha Trough rift evolution is similar to classical magma-poor margins, but synrift magmatism described in adjacent regions indicate abrupt segmentation of the rift system. Plain Language Summary Continental rifting, breakup, and subsequent seafloor spreading represent a continuous evolutionary sequence. The South China Sea (SCS) experienced al steps until seafloor spreading, with much of the existing research focused on the continent-ocean transition (COT) zone. However, there is limited understanding of the structures emerged during the continental rifting. The Xisha Trough, an abandoned rift of the SCS, preserves features formed during continental extension. In this study, we revealed the velocity structure, tectonic features, and density distribution of the profile across Xisha Trough using wide-angle seismic data, multi-channel seismic data, and gravity data. Our results revealed that crustal structure is asymmetric, with distributed small faults at the beginning, and the extension concentrated in the axial region with evolution, where crust experienced significant thinning with the absence of lower crust, and hydration of the upper-most mantle rocks. Our findings indicate that the extension pattern in the Xisha Trough closely resembles that of magma-poor margins. Furthermore, when combined with insights from previous studies in the SCS, our research implies that the rheological behavior throughout the evolution of the SCS exhibits substantial lateral variability. |
| WOS关键词 | CRUSTAL STRUCTURE ; CONTINENTAL EXTENSION ; NORTHWESTERN MARGIN ; SEISMIC STRUCTURE ; NORTHERN MARGIN ; EXHUMED MANTLE ; OCEANIC-CRUST ; NORMAL FAULTS ; BASIN ; SERPENTINIZATION |
| 资助项目 | The 1:250,000 Dalian marine regional geological survey project[DD20243125] ; China Scholarship Council, China[202204910357] ; The Severo Ochoa Centre of Excellence accreditation[CEX2019-000928-S] ; ATLANTIS project from the Spanish Ministry of Science and Innovation[PID2019-109559RB- I00] ; Generalitat de Catalunya[2021 SGR 00429] ; National Key R&D Program of China[2022YFC2808305] ; National Key R&D Program of China[2022YFC2803501] ; Taishan Scholars Program[tsqn202306283] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001535217700001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/202674]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Wang, Wenlong; Ranero, C. R. |
| 作者单位 | 1.ICREA, Barcelona, Spain 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.CSIC, Barcelona Ctr Subsurface Imaging, ICM, Barcelona, Spain 4.Geomar, Kiel, Germany 5.China Geol Survey, Yantai Ctr Coastal Zone Geol Survey, Yantai, Peoples R China 6.BGR, Hannover, Germany 7.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Wenlong,Prada, M.,Cameselle, A.,et al. Mode of Extension During the Xisha Trough Rift in the South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2025,130(7):19. |
| APA | Wang, Wenlong.,Prada, M..,Cameselle, A..,Grevemeyer, I..,Barckhausen, U..,...&Ranero, C. R..(2025).Mode of Extension During the Xisha Trough Rift in the South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,130(7),19. |
| MLA | Wang, Wenlong,et al."Mode of Extension During the Xisha Trough Rift in the South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 130.7(2025):19. |
入库方式： OAI收割
来源：海洋研究所
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