南海北部白云凹陷-东沙岛西南海区的浅地层探测与深水沉积特点

doi:10.11978/j.issn.1009-5470.2011.02.115

Abstract

Abstract:

A new sub-bottom profiler with ability for deep water detection was used along survey lines from the outer shelf of Pearl River Mouth to the mid-slope of Baiyun Sag-Southwest Dongsha Island Waters. From the new high resolution data, it is found that the shallow sediments feature good continuity on the smooth upper slope of the Baiyun Sag, which implies ho-mogenous bedrocks and weak current dynamics. Differently, over the mid-slope of Baiyun Sag-Southwest Dongsha Island Waters, there are remarkable phenomena, such as submarine slide-slump, local along-margin current erosive incision, rugged seafloor topography, and contrasted lateral variation of echoed reflection amplitudes, among others, which implies inhomoge-nous bedrocks and strong along-slope local current dynamics over the mid-slope. Additionally, the data show gas seepage within the submarine ridges, which are recognized as mud volcanoes from multiple channel seismic data. The gas seepage and the contrasted reflection amplitudes variation can be ascribed to plentiful gas existed there and calcification by meth-ane-dependent organism ; thus, the mid-slope of Baiyun Sag-Southwest Dongsha Island Waters has good prospects in petro-leum and gas hydrates.

Key words: Baiyun Sag-Southwest Dongsha Island Waters, sub-bottom profiler, slump, gas seep, mud volcano

YAN Pin,WANG Yan-lin,ZHENG Hong-bo. Characteristics of deep water sedimentation revealed by sub-bottom profiler survey over the Baiyun Sag-Southwest Dongsha Island Waters in the northern South China Sea[J].Journal of Tropical Oceanography, 2011, 30(2): 115-122.

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Characteristics of deep water sedimentation revealed by sub-bottom profiler survey over the Baiyun Sag-Southwest Dongsha Island Waters in the northern South China Sea

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