珠江口表层沉积物常量元素特征及其地球化学意义

 对珠江口348个站位表层沉积物中常量元素的地球化学特征进行了分析，探讨了其地球化学意义。结果表明，沉积物主要化学组成是SiO₂和Al₂ O₃，平均含量分别为60.1%和15.1%，且自河口向海方向SiO₂含量增大，Al₂ O₃含量减少。元素相关性及因子分析表明，沉积物主要由陆源和生物源碎屑沉积组成，包括SiO₂、Al₂O₃、P₂O₅、Fe₂O₃、MnO、TiO₂、K₂O 和CaO，是控制研究区沉积物化学成分的最主要因素；海源碎屑沉积包括Na₂O、MgO和K₂O，且K₂O具有陆源和海源碎屑双重特征.

Major Element Characteristics and Geochemical Significance of Surface Sediments in the Pearl River Estuary

348 sediment samples were taken from the Pearl River Estuary to analyze their major element contents,and to study geochemical characteristics and geological significance.Results show that the main chemical compositions in surface sediments are SiO2 and Al2O3,with average contents up to 60.1% and 15.1% respectively.The content of SiO2 increases from estuary to sea,while the content of Al2O3 decreases.Correlation analysis and factor analysis show that SiO2,Al2O3,P2O5,K2O,TiO2,MnO,Fe2O3 and CaO are the most important factors in surface sediments,mainly originated from continent and marine calcicolous livings.The elements originated from marine include Na2O and MgO,and K2O is derived from continent and marine.