在分析17组河水水样的水化学数据基础上，通过Piper三线图、主成分分析和因子分析方法对克孜勒河流域喀什段河水的水化学特征及成因进行研究，结果表明克孜勒河上游与中下游的水化学类型差异反映出蒸发岩的风化溶解是影响河流水化学组成的主导因素，而河水中含量较高的SO42-主要来源于新近系地层中石膏岩类的风化溶解。克孜勒河流域内蒸发岩风化以石膏岩类的风化为主，盐岩类风化次之，碳酸盐岩风化贡献相对较少。区域内岩石化学风化的主要反应形式是石膏、芒硝、镁硫酸盐岩和盐岩的溶解，其次是方解石和白云石溶解，再次为钠长石溶解。

Based on analyzing water chemistry data of 17 river water samples, the hydro-chemical characteristics and genesis in Kashi reach of Kizil River were studied by the means of Piper trilinear nomograph, principal component analysis and factor analysis. The results showed that the differences of hydrochemical types between the upstream and the middle or lower reaches reflected that the weathering dissolution of evaporates was the dominant influencing factor of the hydrochemical compositions of the river water, while the high quantity of SO42- in river originated from the weathering dissolution of the gypsum salt series in neogene stratigraphic. The evaporites weathering was dominated by gypsum salt weathering, while rock salt weathering took the second place, carbonate weathering contributed less, and the last was albite weathering.

国家自然科学基金资助项目（41230314）；中国地质调查项目（1212011220977）