南海南部沉积物中黏土矿物组成变化及其古沉积信息记录初探

周怀阳; 叶瑛; 沈忠悦

南海南部沉积物中黏土矿物组成变化及其古沉积信息记录初探

1.
中国科学院, 广州地球化学研究所, 广东, 广州, 510640;国家海洋局, 第二海洋研究所, 浙江杭州, 310012
2.
浙江大学, 地球科学系, 浙江, 杭州, 310027

基金项目: 国家重大基础研究"973"项目"地球圈层相互作用中的深海过程和深海记录"资助项目(G2000078500);国家海洋局青年科学基金资助项目;中国科学院广州地球化学研究所知识创新工程领域前沿资助项目(GIGCX-03-07)

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出版历程
- 收稿日期: 2002-04-05
- 修回日期: 2002-12-02

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

摘要

摘要: 通过对南海南部2个代表13万a以来柱状沉积样品高分辨率的黏土矿物组成分析,认为所研究的黏土矿物主要为陆源碎屑成因,埋藏过程中的成岩变化或黏土矿物自生特征不明显,而以采样点南面加里曼丹岛、菲律宾东、西两侧的火山群岛和湄公河流域为主要陆源的地质条件、风化环境及物质迁移途径的差异控制了南海南部沉积物中黏土矿物组成的空间和时间变化.研究发现,沉积物样品中较高的蒙皂石含量对应于地质历史上的暖期,而较低的蒙皂石含量对应于冷期.伊利石的行为及其古海洋指示意义则与蒙皂石相反.将柱状沉积物样品上高分辨率的黏土矿物组成分析作为一种研究方法,有助于研究晚第四纪以来南海陆源碎屑物的源区特征、迁移途径及海区古环境演变.
- 南海 /
- 黏土矿物 /
- 古海洋学
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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参考文献(15)

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