珠江口沉积地球化学特征与古环境演化过程

利用ICP-AES法和重铬酸钾氧化还原容量法测定珠江口沉积物中的微量元素和总有机质含量, 结合沉积物粒度参数, 采用因子分析方法识别控制沉积物化学组成和元素行为的3个因子: 流域侵蚀因子、表生沉积作用控制因子和海洋环境控制因子.研究发现, 3个控制因子的得分曲线基本反映了该地区气候干湿、冷暖的强弱变化, 可作为恢复古气候环境的代用曲线; 在本岩心所代表的沉积年代中共有5次较为明显的环境变化, 为深入研究珠江三角洲区域古环境、古气候演化提供了重要的参考依据. 

Geochemical Characteristics of Sediment of Pearl River Estuary and Its Paleoenvironmental Evolution

The trace metal elements and average grain size were determined for sediments of Pearl River Estuary and three important factors were identified using factor analysis method,which controls chemical compositions of sediments,such as catchment erosion,biogenic deposit,marine dominated condition.Moreover,further research indicates that the factor score curves of the three factors can be used to represent the changes of humidity,temperature and the hydrodynamics,respectively,which provides a good effective appr...