Journal ArticleDOI
New insights into the magmatism in the northern margin of the South China Sea: Spatial features and volume of intraplate seamounts
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In this article, the authors first identified 45 seamounts in the northern margin of the South China Sea (SCS) and simulated their shape with elliptical cones, and estimated the total volume of these 45 seamsounts above seafloor is estimated at about 1885-3078 km3, which is close to the estimates for classic large igneous provinces across the world.Abstract:
The extensive intraplate seamounts are obvious features in the northern South China Sea (SCS) However, the distribution, volume, and origin of these seamounts are not well understood, which greatly hinders our understanding of magmatism in the SCS Based on high-resolution bathymetric data and 147 seismic profiles, and combining gravity and magnetic data, we first identify 45 seamounts in the northern margin of the SCS and simulate their shape with elliptical cones Results show that the total volume of these 45 seamounts above seafloor is estimated at about 1885–3078 km3 and the total volume of intrusive magma above Moho is about 015 Mkm3, which is close to the estimates for classic large igneous provinces across the world These seamounts are mostly located on the continental slope with thin crust (approximately 12–18 km), which reduces the overlying pressure and shortens the magmatic conduits The dominant azimuth of elliptical major axis in seamounts is consistent with the synrift and synspreading fault strikes (NE-NEE), indicating that these pre-existing faults provide magmatic conduits for the subsequent postrift intraplate seamounts Based on three existing clues, ie, (1) the intraplate seamounts, high velocity layer and Hainan mantle plume are contiguous in 3-D space, (2) the high velocity layer is thicker beneath the continental shelf but thinner beneath the slope and (3) the basalts dredged from certain seamounts show OIB-type geochemical features, we propose a magmatic upwelling pattern which contains Hainan mantle plume to explain the spatial and morphological characteristics of these intraplate seamountsread more
Citations
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Journal ArticleDOI
Rapid transition from continental breakup to igneous oceanic crust in the South China Sea
H.C. Larsen,H.C. Larsen,Geoffroy Mohn,Michael Nirrengarten,Z. Sun,Joann M. Stock,Z. Jian,Adam Klaus,Carlos A. Alvarez-Zarikian,Jacopo Boaga,Stephen A. Bowden,Anne Briais,Yifeng Chen,Deniz Cukur,Kelsie Dadd,Weiping Ding,Michael J. Dorais,Eric C. Ferré,Fabricio Ferreira,A. Furusawa,A.J. Gewecke,Jessica L. Hinojosa,T. W. Höfig,Kan-Hsi Hsiung,Baoqi Huang,Enqing Huang,Xiao-Long Huang,Shijun Jiang,Hong Jin,Benjamin G. Johnson,Robert Kurzawski,Robert Kurzawski,Chao Lei,B. Li,L. Li,Y. Li,Jian Lin,Chunji Liu,Zhifei Liu,A. Luna,C. Lupi,Anders McCarthy,Anders McCarthy,Lachit S. Ningthoujam,N. Osono,David W. Peate,Patricia Persaud,N. Qiu,C.M. Robinson,Sara Satolli,Isabel Sauermilch,Julie Schindlbeck,S.M. Skinner,Susanne M. Straub,X. Su,Chih-Chieh Su,Liyan Tian,F.M. van der Zwan,F.M. van der Zwan,Shiming Wan,H. Wu,R. Xiang,R. Yadav,Liang Yi,P. S. Yu,C. Zhang,J. Zhang,Yang Zhang,Ning Zhao,G. Zhong,L. Zhong +70 more
TL;DR: In this paper, the authors report International Ocean Discovery Program drilling data from the northern South China Sea margin, testing the magma-poor margin model outside the North Atlantic, showing initiation of mid-Ocean Ridge basalt type magmatism during breakup, with a narrow and rapid transition into igneous oceanic crust.
Journal ArticleDOI
Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes
TL;DR: In this article, the authors present two multi-channel seismic transects across the northern flank of the South China Sea basin to reveal the internal structures related to Cenozoic tectono-magmatic processes during seafloor spreading.
Journal ArticleDOI
The role of magmatism in the thinning and breakup of the South China Sea continental margin
Zhen Sun,Jian Lin,Jian Lin,Ning Qiu,Zhimin Jian,Pinxian Wang,Xiong Pang,Jinyun Zheng,Benduo Zhu +8 more
TL;DR: The northern central SCS continental margin challenged the typical magmapoor and magma-rich models by having combined features of both and showed many features different from the classic examples of Iberia and Newfoundland.
Journal ArticleDOI
Lateral evolution of the rift-to-drift transition in the South China Sea: Evidence from multi-channel seismic data and IODP Expeditions 367&368 drilling results
Weiwei Ding,Zhen Sun,Geoffroy Mohn,Michael Nirrengarten,Julie Tugend,Gianreto Manatschal,Jiabiao Li +6 more
TL;DR: In this article, a short-period magmatic event occurred during the latest stage of continental rifting and intruded the edge of the thinned continental crust, triggering crustal breakup and onset of steady-state seafloor spreading.
Journal ArticleDOI
Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology
Shaohong Xia,Fang Zhao,Dapeng Zhao,Chaoyan Fan,Shiguo Wu,Lijun Mi,Jinlong Sun,Jinghe Cao,Kuiyuan Wan +8 more
TL;DR: In this paper, the authors investigate the detailed structural features of post-rift magmatism in the crust of the South China Sea (SCSCCS) northern margin, and show that a wide distribution of shallow igneous sills and intrusions are spatially and tectonically linked to the lower crustal high-velocity bodies and submarine volcanism.
References
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