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Geophysical constraints on the lithospheric structure in the northeastern South China Sea and its implications for the South China Sea geodynamics ArchiMer
Liu, Siqing; Zhao, Minghui; Sibuet, Jean-claude; Qiu, Xuelin; Wu, Jonny; Zhang, Jiazheng; Chen, Chuanxu; Xu, Ya; Sun, Longtao.
An E-W oriented OBS2015-2 wide-angle refraction profile was shot in the northeastern South China Sea (SCS) between refraction profiles T1 and T2 in order to better understand the variability of the crustal composition and the role of specific tectonic features. P-wave velocity models established from forward and inversion modeling imaged a 12 to 15 km-thick thinned continental crust and a high velocity layer (HVL) in the lower crust which is interpreted as magmatic underplating. Profile OBS2015-2 cut across the Taiwan transfer zone (TTZ), which separates two consecutive rifted segments of different orientations in the northeastern SCS. The TTZ is a well-defined upper crustal feature characterized by a HVL with different thickness on both sides. We have...
Tipo: Text Palavras-chave: Northeastern South China Sea; Continent-ocean boundary (COB); Wide-angle reflection/refraction data; Thinned continental crust intruded by post-rifting volcanism; Taiwan transfer zone (TTZ).
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00443/55458/56974.pdf
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PostSeafloor Spreading Volcanism in the Central East South China Sea and its Formation Through an Extremely Thin Oceanic Crust ArchiMer
Zhao, Minghui; He, Enyuan; Sibuet, Jean-claude; Sun, Longtao; Qiu, Xuelin; Tan, Pingchuan; Wang, Jian.
P-wave velocity models were obtained by forward and inverse modeling from 38 ocean bottom seismometers deployed in the central East sub-basin of the South China Sea (SCS). Four types of crust have been defined; a) thin oceanic crust (<5 km), b) typical oceanic crust (5-6 km), c) thick oceanic crust hosting post-spreading volcanoes (>6 km) with significant intrusive roots, and d) thick oceanic crust with enhanced spreading features (>6 km) but without significant roots. Within the central East sub-basin, the thin oceanic crust, only identified inside a 80-km wide zone, is located within an overall 150-km wide domain characterized by N055° seafloor spreading trends. The post-spreading volcanoes were formed during a N-S tensional episode around 6-10...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00427/53882/54951.pdf
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