贵州乌江水系枯水期河水硫同位素组成研究  

Sulfur isotopic compositions of Wujiang River water in Guizhou Province during low-flow period

作　　者：蒋颖魁[1,2] 刘丛强[1] 陶发祥[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室 [2]中国科学院研究生院,北京100049

出　　处：《地球化学》2006年第6期623-628,共6页Geochimica

基　　金：国家重点基础研究发展计划项目(2006CB403200);中国科学院知识创新工程重要方向项目(KZCX3-SW-140);国家自然科学基金(40372108)

摘　　要：对枯水期乌江及其主要支流河水的硫同位素组成进行了研究。河水SO42-的δ34S值在-15.7‰～18.9‰之间,干流δ34S值介于-3.7‰～0.0‰之间。主要支流河水的SO42-浓度和δ34S值具有明显的区域性差异:上游碳酸盐岩地区支流河水SO42-浓度较高而δ34S值较低,河水中的SO24-来源于煤中还原态硫的氧化、矿床硫化物氧化和大气降水;下游碳酸盐岩夹碎屑岩地区支流河水则相反,具有较低SO24-浓度和较高δ34S值,河水中的SO24-来源于硫酸盐蒸发岩溶解、大气降水以及煤中还原态硫的氧化。干流的硫同位素组成显示枯水期河水中的硫酸盐主要来源于碳酸盐岩地区。The sulfur isotopic composition of the Wujiang River water and its catchment area water has been measured during low-flow period. The δ^34S values of the river water range from - 15.7‰ to 18.9‰, whereas the δ^34S values of the mainstream show only a narrow range and exhibit negative values from - 3.7‰ to 0.0‰. Spatial variation in SO4^2- concentration and δ^34S of the tributaries over the catchment area is obvious. The upper part of the Wujiang River catchment is dominated by carbonate rocks and coal-bearing formations. The tributaries with depleted ^34S in this area have high SO4^2- concentrations and dominantly originate from rainwater SO4^2-, SO4^2- from oxidation of sulfur in coal and sulfides deposits. Samples from the tributaries of the lower part, which is dominated by carbonate rocks interbedded with clastic rocks, have relatively enriched ^34S and lower SO4^2- concentrations. SO4^2- in these waters appears to result from solution of gypsum, rainwater SO4^2- and oxidation of sulfur in coal. The sulfur isotopic composition of the mainstream indicates that most of the SO4^2- in the Wujiang River water is from the upper part.

关 键 词：硫同位素 枯水期 乌江水系 

分 类 号：P593[天文地球—地球化学] X142[天文地球—地质学]