长江宜昌段水系沉积物镉高值带成因  

Preliminary Study on the Sources of High Cadmium Value Belt of Stream Sediments in Yichang Section of the Yangtze River

作　　者：夏锦霞[1] 李方林[2] 杨东[1] 

机构地区：[1]中国地质大学研究生院,武汉430074 [2]中国地质大学地球科学学院,武汉430074

出　　处：《吉林大学学报（地球科学版）》2009年第2期305-311,共7页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局项目(06010017)

摘　　要：应用贡献因子和富集因子等方法对长江宜昌段水系沉积物Cd的来源进行研究,结果表明:研究区内地层对宜昌段水系沉积物Cd的贡献由大到小依次为:震旦系>二叠系>泥盆系>志留系;前震旦系、寒武系、奥陶系、三叠系、侏罗系和白垩系地层则对长江宜昌段Cd高值带的形成有一定的削弱作用。利用贡献因子、富集因子和MapGIS空间分析综合研究表明,震旦系和二叠系含矿富Cd地层的风化产物是长江宜昌段Cd高值带的主要自然来源。区内锌矿、煤矿和磷矿开采过程中的尾砂、废水的堆积和排放是长江宜昌段Cd高值带的重要人为污染源。Contribution factors and enrichment factors were applied for research of the high cadmium value belt of sources in Yichang section of the Yangtze River. The result showed that the stratas in the study area made a different contribution to the high Cd-value belt, which from big to small is the Sinian system, the Permian system, the Devonian system and the Silurian system. However, the Pre-Sinian system, the Cambrian system, the Ordovician system, the Triassic system, the Jurassic system and the Cretaceous system slow down the formation of high Cd value belt. Combined study of contribution factors, enrichment factors and MapGIS spacial analyses, it showed that the major natural sources were from the processes of weathering and draining of the Sinian system and the Permian system, which are enriched of mine and cadmium. During the process of mining beneficiation, a large number of tailings and waste water were accumulated and discharged into the branch river directly, which should be the important anthropogenic pollution sources.

关 键 词：富集因子 贡献因子 Cd高值带 污染源 宜昌市 

分 类 号：X142[环境科学与工程—环境科学]