渤黄海表层沉积物粘土矿物组成及分布特征对物源的指示意义

Composition and Distribution of Clay Minerals in Surface Sediments of the Bohai Sea and the Yellow Sea and Their Implications to Provenance

通过对在渤、黄海海域73个站位的表层沉积物中粘土矿物种类和含量分析,研究了渤、黄海表层沉积物粘土矿物的组合类型、分布特征及其物质来源。研究结果表明,渤、黄表层粘土矿物组合为:伊利石、蒙脱石、高岭石、绿泥石,渤海表层粘土粒级沉积物中有方解石存在,黄海表层粘土粒级沉积物中有长石存在。伊利石含量最高,高岭石和绿泥石含量次之,蒙脱石含量最低。伊利石含量在渤海含量高,北黄海含量低,南黄海西高东低;蒙脱石含量在渤海高,在北黄海东高西低,在南黄海西高东低;高岭石含量在渤海低,在黄海高;绿泥石含量分布与蒙脱石相反,在渤海低,在北黄海东低西高,在南黄海西低东高。渤、黄海沉积物主要是入海河流输入的陆源物质,渤海沉积物以黄河物质为主。黄海沉积物主要来自黄海沿岸流携带来的现代黄河物质,老黄河口堆积体受侵蚀而搬运的物质,以及黄海暖流和长江冲淡水带来的长江物质。

The clay minerals composition of the surface sediments in the Bohai Sea and Yellow Sea from73 stations were studied with focus on clay assemblages and their distribution pattern as well as provenance.The research show that illite dominates in surface sediments of the studied area with kaolinite or chlorite as the second and smectite the lowest.Calcites were found in the clay-sized sediments of the Bohai Sea and feldspar existed in the clay fraction sediments of the Yellow sea.There is high content of illite in the Bohai Sea and low content in the northern Yellow sea;high content of smectite in the Bohai Sea.The content of kaolinite in the Bohai Sea is low,and is high in the Yellow Sea,and the content of Chlorite distribute in contrast to the smectite.Clay minerals are mainly from the Yellow River and Yangtze River.The sediments of the Bohai Sea dominates in Yellow River,and the sediments of the Yellow Sea mainly come from the modern Yellow River materials carried by the Yellow Sea Coastal Current,the substance from the erosion of old deposit river estuary,the Yangtze River and the Yellow Sea Warm Current carried the substance of Yangtze River.