南沙群岛海区北部中生界地震特征分析

doi:10.11978/j.issn.1009-5470.2012.04.011

Abstract

Abstract:

It was inferred that there were Mesozoic marine deposits in the Nansha Islands waters through extensive seismic reflection profiles, drilling and dredge sample. A new high resolution 2D seismic survey with long cable was carried out along a NNW-SSE line from the southwestern sub-basins of the South China Sea into the northern part of the Nansha Islands waters area in the South China Sea in 2009. It was shown that there is a great set of infrastructure with dipping and closely spaced reflection with high angle fault below rift and drape sedimentation. Through analysis of the drilling and dredge sample of Mesozoic samples in the Nansha Islands waters area, the sedimentary strata are divided into three structure layers by an angular disconformity, which are post-rift, syn-rift and Mesozoic marine sediments, respectively. The NE to WS trending thick Mesozoic was remained in banding distribution, which indicates that the Cenozoic rift structure is primarily characterized by the occurrence of tectonic block. It is inferred that the northern margin of the Nansha Islands waters is located in the fore-arc basin of the East Asian continental margin, close to the magmatic arc, in the Mesozoic.

Key words: Nansha Islands waters, lower tectonic layer, Mesozoic, marine sediment, tectonic block

CLC Number:

P738.4

WANG Yan-lin,YAN Pin,ZHENG Hong-bo, LIU Hai-ling, LIAO Lin. Stratigraphic and structural characteristics of the northern margin of Nansha Islands waters in the South China Sea[J].Journal of Tropical Oceanography, 2012, 31(4): 83-89.

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Stratigraphic and structural characteristics of the northern margin of Nansha Islands waters in the South China Sea

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