渤海湾西部表层沉积物粒度及黏土矿物特征分析

The sediment grain size characteristics and analysis of sources in the western Bohai Bay

对渤海湾西部海域和西岸入海河流中76个表层沉积物样品进行粒度及黏土矿物分析,研究表明该区有3种沉积物类型,黏土质粉砂分布于整个研究区,约占表层样的90%,是研究区最主要的沉积物类型;研究区黏土矿物以伊利石为主,黏土矿物组合为伊利石-高岭石-绿泥石-蒙皂石;渤海湾西部表层沉积物主要来源于海河等渤海湾西岸入海河流中的陆源碎屑物,滦河对研究区基本没有影响,黄河对研究区的影响变得比较小。对于研究渤海湾西岸的沉积特征及沉积物物源、了解陆地河流对于研究区海洋沉积环境的影响有着一定的科学意义。

This paper shows that there are 3 types of sediments in the study area according to analysis of 76 surface samples which were sampled from the western Bohai Bay waters and rivers that flow into the sea from the west coast. Clayey silt distributes throughout the study area, and is the most important type of sediments in the study area, accounting for about 90% of the surface samples. The sediment dynamic environmental characteristics of the sur-face sediments in the area were studied using the Flemming triangle graphic method and the results indicate that the sedimentary dynamics in the study area was relatively weak. The clay mineral analysis of 60 surface samples shows that the illite is the main clay mineral, and the clay mineral assemblage in the study area is illite - kaolinite - chlorite - smectite stone. The exploration of sediment source based on grain size and clay minerals shows that the surface sediments of the western Bohai Bay were mainly from the terrigenous detritus, which were carried by the rivers flowing into the sea in the western Bohai coast, such as the Haihe River, while the Luanhe River had nearly no effect on the surface sediments in the study. The influence of the Yellow River on the sea surface sediments was weak.