doi:

DOI: 10.3724/SP.J.1140.2013.06081

Marine Geology & Quaternary Geology (海洋地质与第四纪地质杂志) 2013/33:6 PP.81-91

INTEGRATED GEOPHYSICAL RESEARCH IN THE MIDDLE-NORTHERN CONTINENTAL MARGIN OF THE SOUTH CHINA SEA BASED ON WIDE-ANGLE SEISMIC PROFILE OBS2006-3


Abstract:
The OBS2006-3profile located in the northeastern South China Sea(SCS),as an integrated endeavor of geophysical research,passes through the Dongsha Islands and the Chaoshan Depression,and ends at the margin of the ocean basin.Density modeling remains the pivotal part of the research.Based on the model,combined with the geological and geophysical data available,it is revealed that:(1)A Mesozoic subduction zone might occur in the sea area around the Dongsha Islands,which might be the same as the East Asia subduction system.The Dongsha fault is probably the paleo-suture zone,and the Chaoshan depression might be the Mesozoic fore-arc basin,and the Dongsha-Peikang uplift might be a paleo-volcanic arc.(2)The thickest Mesozoic in the Chaoshan depression is around~9km with oil and gas potential.There may be magmatic intrusions and/or metamorphism to certain extent.

Key words:density profile,inversion,continental margin,North Central South China Sea

ReleaseDate:2016-08-31 18:47:07



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