闽江钻孔沉积物微量元素地球化学研究

• Published in: Hăiyang dĭzhĭ yu dĭsĭjĭ dĭzhĭ Vol. 35; no. 2; p. 81
• Main Authors: ZHANG, Guifang, Zhuo, ZHEN, Rollet, BARRY, HUANG Kangyou, YUE Yuanfu, ZHU Guangqi
• Format: Journal Article
• Language: Chinese
• Published: Beijing Marine Geology and Quaternary Geology 01.01.2015
• Subjects: Alluvial deposits; Barium; Distribution; Distribution patterns; Drainage; Drainage area; Drainage basins; Earth; Earth crust; Estuaries; Estuarine dynamics; Fluvial deposits; Fluvial sediments; Geochemistry; Lava; Rare earth elements; Rivers; Sediment; Sedimentary basins; Sedimentary environments; Sediments; Strontium; Swamps; Trace elements; Min River; Yellow River; Yangtze River
• ISSN: 0256-1492
• DOI: 10.3724/SP.J.1140.2015.02081

河流沉积物微量元素特征对指示沉积演化历史、沉积环境及沉积物的物质来源具有十分重要的示踪作用。闽江福州段540 cm的沉积物微量元素比值(Rb/Sr和Sr/Ba)和稀土元素地球化学特征,敏锐地指示了沉积环境从河流快速转变为沼泽的突变点,同时,也清楚地指示了不同沉积环境下的物源变化。受控于闽江流域丰富的岩浆岩和稀土资源以及呈酸性的福建土壤和闽江水体,闽江钻孔沉积物REE明显高于上地壳、长江和黄河,与福建土壤最为接近。经过球状陨石和北美页岩标准化之后,闽江钻孔沉积物稀土元素分配模式呈右倾型,与长江和黄河沉积相比具有更好的轻稀土富集。δEu负异常和δCe正异常非常显著,并且与∑REE密切相关,表明它们均受到源区环境变化和搬运作用的控制。