南海北部洋陆转换带地震反射特征和结构单元划分*

doi:10.11978/j.issn.1009-5470.2012.03.004

Abstract

Abstract: Rifted continental margins and basins are mainly formed by the lithospheric extension. Thinned lithosphere of passive continental margins leads to decompression melt of magma and created oceanic crust as well as thinned ocean-continent transition zone. A multi-channel seismic Line MCS 2010-1 in the northern South China Sea, acquired by the R/V "Shiyan 2" of the South China Sea Institute of Oceanology in 2010, is processed and analyzed in this study. Reflection characteristics of a continent-ocean transition (COT) zone are summarized and outlined. Results show that the COT zone is mainly composed of the northern syn-rift subsidence zone, central volcanic or buried volcanic uplift zone, and tilt faulted blocks near the South China Sea basin. Compared to the previous seismic reflection data and refraction velocity models, the range of the COT zone is outlined, from about 225 km wide in the northeastern South China Sea, 160 km wide in the central to 110 km in the northern-central South China Sea. Epicenter distributions of sporadic and larger than 6 magnitude earthquakes suggest that the COT zone in the northern South China Sea is still an active seismic zone.

Key words: passive continental margins, continent-ocean transition zone, northern South China Sea, multi-channel seismic investigation, seismic reflection

CLC Number:

P738.4

ZHU Jun-jiang , QIU Xue-lin, XU Hui-long, ZHAN Wen-huan, ZHAO Ming-hui, WEI Xiao-dong,SUN Jin-long, YANG Rui, XIA Shao-hong, HUANG Hai-bo. Seismic reflection characteristic and structure unit division of a continent-ocean transition zone in the northern South China Sea[J].Journal of Tropical Oceanography, 2012, 31(3): 28-34.

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Seismic reflection characteristic and structure unit division of a continent-ocean transition zone in the northern South China Sea

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