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Post-seafloor spreading magmatism and associated magmatic hydrothermal systems in the Xisha uplift region, northwestern South China Sea
Gao, Jinwei1,2,3; Bangs, Nathan3; Wu, Shiguo1,2; Cai, Guanqiang4; Han, Shuoshuo3; Ma, Benjun1; Wang, Jiliang1; Xie, Yangbing1; Huang, Wenkai4; Dong, Dongdong5; Wang, Dawei1
2019-08-01
Source PublicationBASIN RESEARCH
ISSN0950-091X
Volume31Issue:4Pages:688-708
Abstract

Submarine magmatism and associated hydrothermal fluid flows has significant feedback influence on the petroleum geology of sedimentary basins. This study uses new seismic profiles and multibeam bathymetric data to examine the morphology and internal architecture of post-seafloor spreading magmatic structures, especially volcanoes of the Xisha uplift, in extensive detail. We discover for the first time hydrothermal systems derived from magmatism in the northwestern South China Sea. Numerous solitary volcanoes and volcanic groups occur in the Xisha uplift and produce distinct seismic reflections together with plutons. Sills and other localized amplitude anomalies were fed by extrusions/intrusions and associated fluid flow through fractures and sedimentary layers that may act as conduits for magma and fluid flows transport. Hydrothermal structures such as pipes and pockmarks mainly occur in the proximity of volcanoes or accompany volcanic groups. Pipes, pockmarks and localized amplitude anomalies mainly constitute the magmatic hydrothermal systems, which are probably driven by post-seafloor spreading volcanoes/plutons. The hydrothermal fluid flows released by magma degassing or/and related boiling of pore fluids/metamorphic dehydration reactions in sediments produced local overpressures, which drove upward flow of fluid or horizontal flow into the sediments or even seafloor. Results show that post-seafloor spreading magmatic activity is more intense during a 5.5 Ma event than one in 2.6 Ma, whereas the hydrothermal activities are more active during 2.6 Ma than in 5.5 Ma. Our analysis indicates that post-seafloor spreading magmatism may have a significant effect on hydrocarbon maturation and gas hydrate formation in the Xisha uplift and adjacent petroliferous basins. Consequently the study presented here improves our understanding of hydrocarbon exploration in the northwestern South China Sea.

KeywordHydrothermal Fluid Flows Nw South China Sea Post-seafloor Spreading Magmatism Xisha Uplift
DOI10.1111/bre.12338
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China ; Hainan Provincial Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; China Geological Survey Projects
Language英语
Funding ProjectNational Natural Science Foundation of China[41476042] ; National Natural Science Foundation of China[41706046] ; National Natural Science Foundation of China[41706051] ; Hainan Provincial Natural Science Foundation of China[417210] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2018401] ; China Geological Survey Projects[DD20160140] ; China Geological Survey Projects[GZH201400210]
WOS KeywordNorthern Zhongjiannan Basin ; Continental-margin ; Crustal Structure ; Fluid-flow ; Deep-sea ; Different Expressions ; Northeastern Margin ; Sedimentary Basins ; Organic Maturation ; Sill Emplacement
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000475467500002
PublisherWILEY
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/6918
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorBangs, Nathan
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Shandong, Peoples R China
3.Univ Texas Austin, Inst Geophys, Austin, TX 78712 USA
4.Guangzhou Marine Geol Survey, Minist Land & Resources, Key Lab Marine Mineral Resources, Guangzhou, Guangdong, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Gao, Jinwei,Bangs, Nathan,Wu, Shiguo,et al. Post-seafloor spreading magmatism and associated magmatic hydrothermal systems in the Xisha uplift region, northwestern South China Sea[J]. BASIN RESEARCH,2019,31(4):688-708.
APA Gao, Jinwei.,Bangs, Nathan.,Wu, Shiguo.,Cai, Guanqiang.,Han, Shuoshuo.,...&Wang, Dawei.(2019).Post-seafloor spreading magmatism and associated magmatic hydrothermal systems in the Xisha uplift region, northwestern South China Sea.BASIN RESEARCH,31(4),688-708.
MLA Gao, Jinwei,et al."Post-seafloor spreading magmatism and associated magmatic hydrothermal systems in the Xisha uplift region, northwestern South China Sea".BASIN RESEARCH 31.4(2019):688-708.
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