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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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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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