On the variation of clay minerals and their paleosedimentary records in the sediment cores in the southern area of the South China Sea

ZHOU Huai-yang; YE Ying; SHEN Zhong-yue

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ZHOU Huai-yang, YE Ying, SHEN Zhong-yue. On the variation of clay minerals and their paleosedimentary records in the sediment cores in the southern area of the South China Sea[J]. Haiyang Xuebao, 2004, 26(2): 52-60.

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On the variation of clay minerals and their paleosedimentary records in the sediment cores in the southern area of the South China Sea

1.
Guangzhou Institute of Oceanography, Chinese Academy of Sciences, Guangzhou 510640, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China

Received Date: 2002-04-05
Rev Recd Date: 2002-12-02

Abstract

Abstract

Based on XRD results of clay mineral components with high resolution sampled sediments from two gravity cores with a sedimentary history about 130 000 a in the southern part of South China Sea, it is recognized that the clay minerals are mainly of terrigenous rather than authigenic origin.The differences in geologic condition, weathering environment and transport route in the lands around the study area, such as Kalimantan Island in the east, control the spatio temporal variation of component distribution of clay minerals along the sedimentary core.It is inter esting to discover that high concentration of smectite corresponds to the warm or interg lacial period, and low concentration of smectite to the cold or glacial period.The behavior and paleoceanographic indication of illite are opposite to those of smectite.As a research method, the high resolution study of clay components in the sediment cores will be helpful to explaining the source characteristics, transport path and paleoclimatic evolution since the late Quaternary in the South China Sea.
- South China Sea,
- clay minerals,
- paleoceanography

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