湖南主要河流化学组成及地质背景对比分析

Characteristic element composition of main rivers sediments and their geological background in Hunan Province

湘江和沅江分别是湖南省境内最大河流和第二大河流,湘江与沅江沉积物化学组成存在明显差异.沅江沉积物相对富集主量元素Mg O、Ca O、Na2O和微量元素Ge、Ba,而湘江沉积物相对以富Mn O及其Cu、Pb、Zn等其他微量元素为特征,湘江沉积物中主微量元素含量变异系数均高于沅江沉积物,元素含量变化大,沅江元素含量变化小.湘江流域岩层出露有前震旦系砂岩和板岩、古生界碳酸盐岩、中新生界砂岩、印支期和燕山期花岗岩和第四系沉积物等地层岩石.沅江流域以千枚岩、板岩、石英砂岩和第三纪红色岩层为主.

There is a significant difference in the chemical composition between Xiangjiang and Yuanjiang river sediments. Yuanjiang sediments relative concentration of major elements of MgO, CaO, Na20 and trace elements Ge, Ba. And the Xiangjiang river sediments in the major and trace elements Content Variation coefficients were all higher than that of Yuanjiang River sediments, and Yuanjiang element content changes little. Xiangjiang basin rocks crop out of Pre- Sinian sandstone and slate, Paleozoic carbonate rocks, Mesozoic and Cenozoic sandstone, Indosinian and Yanshanian graniteand Quaternary System rock. Yuanjiang River basin rocks mainly crop out of Phyllite, Slate, Quartz sandstone and Tertiary red rock.