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Crustal structure across the post-spreading magmatic ridge of the East Sub-basin in the South China Sea: Tectonic significance ArchiMer
He, Enyuan; Zhao, Minghui; Qiu, Xuelin; Sibuet, Jean-claude; Wang, Jian; Zhang, Jiazheng.
The 140-km wide last phase of opening of the South China Sea (SCS) corresponds to a N145° direction of spreading with rift features identified on swath bathymetric data trending N055° (Sibuet et al., 2016). These N055° seafloor spreading features of the East Sub-basin are cut across by a post-spreading volcanic ridge oriented approximately E-W in its western part (Zhenbei-Huangyan seamounts chain). The knowledge of the deep crustal structure beneath this volcanic ridge is essential to elucidate not only the formation and tectonic evolution of the SCS, but also the mechanism of emplacement of the post-spreading magmatism. We use air-gun shots recorded by ocean bottom seismometers to image the deep crustal structure along the N-S oriented G8G0 seismic...
Tipo: Text Palavras-chave: East Sub-basin of the South China Sea; Zhenbei Huangyan seamounts chain; 2-D crustal structure; Post-spreading magmatism.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00317/42858/42284.pdf
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Oceanic mantle reflections in deep seismic profiles offshore Sumatra are faults or fakes ArchiMer
Sibuet, Jean-claude; He, Enyuan; Zhao, Minghui; Pang, Xinming; Klingelhoefer, Frauke.
In the late 90's, some faults identified within oceanic crust were demonstrated to be artifacts arising from out-of-plane scattering along linear sediment-buried fault scarps. Symmetrical mantle reflections observed southwest northern Sumatra on seismic reflection profiles have been identified as faults cutting through the upper mantle down to unprecedented depths reaching similar to 45 km. Seawater being conveyed along sub-vertical re-activated fracture zones (FZs) to the upper mantle, the mantle portions of FZs are serpentinized and act as mirrors for seismic rays. We suggest that the mantle features are not faults but artifacts resulting from out-of-plane reflections on these mirrors. Two perpendicular seismic profiles crossing the same FZ display two...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00516/62771/67173.pdf
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3D seismic structure of the Zhenbei-Huangyan seamounts chain in the East Sub-basin of the South China Sea and its mechanism of formation ArchiMer
Wang, Jian; Zhao, Minghui; Qiu, Xuelin; Sibuet, Jean-claude; He, Enyuan; Zhang, Jiazheng; Tao, Chunhui.
The probable N055°-oriented extinct spreading ridge of the East Sub-basin is cut across by the post-spreading volcanic ridge oriented approximately E–W in its western part and called the Zhenbei–Huangyan seamounts chain. A three-dimensional ocean bottom seismometer survey was conducted in 2011 and covered both the extinct spreading ridge and the Zhenbei–Huangyan seamounts chain in the East Sub-basin. The comprehensive seismic record sections of 39 ocean bottom seismometers underline the high-quality data with clear and reliable P-wave seismic first arrivals. The three-dimensional tomographic results show that the crust is oceanic on each side of the Zhenbei–Huangyan seamounts chain. The seafloor spreading lineaments and associated fracture zones pattern...
Tipo: Text Palavras-chave: Extinct spreading ridge; Zhenbei-Huangyan seamounts chain; 3D seismic structure; Post-spreading magmatism; East Sub-basin; South China Sea.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00314/42515/44989.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
Registros recuperados: 4
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