【摘要】 以X-射线衍射仪和偏光显微镜为主要手段,对南海调查区表层底质沉积物中黏土和碎屑矿物组分进行分析和研究,结果表明黏土矿物主要有伊利石、蒙皂石、高岭石和绿泥石,其组合特征在不同区域表现出明显的差异。碎屑成分主要由生物壳(钙质和硅质)、轻矿物(石英、长石为主)和含量低但种类多的重矿物组成。一般认为物质来源是调查区沿岸风化岩石遭受进一步剥蚀后细小组分通过水动力搬运沉积而成的。钙质和硅质生物壳分布受南海碳酸盐补偿深度(CCD)的控制。更多还原

【Abstract】 The compositions of clay and detrital minerals in the surface sediment of the northern South China Sea are studied based on the analyses of X-ray diffraction and microscope observations.It is found that clay minerals consist mainly of illite,smectite,kaolinite and chlorite.Distribution characeteristics of the clay and detrital minerals are apparently different in the western and eastern areas.Detrital compositions are mainly microfossils(calcareous and siliceous),light minerals(quartz and feldspar),and many kinds of heavy minerals with low contents.The research result shows that the detrital materials are derived from the fine eroded debris in the coastal areas by the sea current.The distributions of calcareous and siliceous microfossils are apparently controlled by the carbonate dissolution.更多还原