珠江口晚第四纪沉积物中粘土矿物及其指相意义

CLAY MINERALS IN THE LATE QUATERNARY SEDIMENTS OF THE ZHUJIANG ESTUARY AND THEIR FACIES SIGNIFICANCE

本文用X射线衍射相分析,研究了珠江口晚第四纪沉积物中的粘土矿物。结果表明,该区粘土矿物中平均含有54％伊利石、27％高岭石、18％绿泥石和少量蒙脱石,其分布是向海方向伊利石含量增加,高岭石的正相反。珠江三角洲的粘土矿物组合可分为西北江三角洲矿物省和东江三角洲矿物省,其伊利石和高岭石的含量变化具有指相意义。

The bottom sediments of the Zhujiang Estuary contain on average 54%illite,27%kaolinite,18%chlorite and a small amount of smectite.The distribution of the clay minerals show an increase in illite and a decrease in kaolinite seawardly.Based on the distribution and character of composition of the clay minerals,the Late Quaternary sediments in the Zhujiang River Delta may be divided into two regions of clay minerals component.The Xijiang and Beijiang River Delta mineral region is characterized by illite-kaolinite,and the Dongjiang River Delta mineral region by kaolinite-illite-montmorillonite is composition.According to the changes of clay mineral content,the contents of illite and kaolinite in clay minerals of the Zhujiang River Deltaic Late Quaternary are significant in facies indication.Illite and kaolinite are negatively correlated.