柴达木盆地西北部库拉木勒克萨伊河—阿拉尔河流域水化学特征分析

Hydrogeochemical Characteristics of Kulamulekesayi-Alaer River Valley in Northwestern Qaidam Basin

运用水文地球化学常用分析方法,对柴达木盆地西北部库拉木勒克萨伊河—阿拉尔河流域进行了系统研究,分析了河水中主要离子特征、控制机制及其来源。结果表明:该流域为低矿化度、天然弱碱性淡水;河水类型主要为重碳酸盐型水,部分为氯化物型水;河水中主要离子的化学特征受控于岩石风化作用,流域蒸发作用逐渐显露,阿拉尔河蒸发作用较明显。河水中主要离子来自于岩盐、钾盐、硬石膏、白云石和方解石的风化溶解,并且受到少量溶解于河水中硅酸盐矿物的影响。

In the present work, characteristics, control mechanisms and sources of the main ions in Kulam-ulekesayi- Alaer river basin were systematically studied with common hydrogeochemical analysis meth- ods. The results show that the basin water is natural low-mineralizedslightly alkaline freshwater. The water is mainly bicarbonate-type water with part of the chloride-type water. The main ions are controlled by the rock weathering, and the effects of evaporation on the water gradually enhanced, especially in the Alaer River. The main ions in the river are mainly from the weathering and dissolution of halite, sylvite, an- hvdrite.dolomite and calcite with the impact of tiny silicate minerals dissolved in the river.