doi:

DOI: 10.3724/SP.J.1140.2013.06001

Marine Geology & Quaternary Geology (海洋地质与第四纪地质杂志) 2013/33:6 PP.1-7

GRAIN SIZE DISTRIBUTION OF SURFACE SEDIMENTS IN THE SOUTHWESTERN SOUTH CHINA SEA AND TRANSPORT TREND ANALYSIS


Abstract:
Grain-size analysis is carried out for the 95surface sediment samples from the southwestern part of the South China Sea(3°56′~11°53′N,108°30′~113°47′E),where clayey silt and silty clay dominate,with sand and silty sand only occurred in the most southwestern shallow part.There shows a trend of decreasing grain-size,increasing sorting and decreasing skewness from the shallow water to deeper water.The Kriging method was employed to insert data of the grain-size parameters(mean grain-size,sorting coefficient and skewness),and then the trend analysis was carried out for the interpolated data using the GSTA program.It is revealed that the seabed topography plays a key role in the sediment transport.There is a topographic high in the area including the Guang-ya submarine plateau,the Nan-wei-tan plateau,and the Yong-shu-bei submarine plateau.To the north of the high,sediments from the western South China Sea continental shelf are transported into the Southwest Basin of South China Sea;to the south of the boundary,however,materials from the Sunda shelf and the Kalimantan Island are transported into the Nan-wei-xi and Bei-kang slope basin passing by the shelf break.The episodic sedimentary events,such as the turbidity current,also have significant impacts on the grain-size distribution pattern.The aggregation of the components8μm should not be ignored.Further researches are required for details.

Key words:surface sediments,grain-size distribution,transport trend analysis,the southwestern part of the South China Sea

ReleaseDate:2016-08-31 18:47:05



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