塔里木盆地河水氢氧同位素与水化学特征分析

Analysis of stable isotopes and hydrochemistry of rivers in Tarim Basin

塔里木盆地是内陆地区重要的能源战略基地,研究其地表水的氢氧同位素和水化学特征对于区域水资源研究有重要意义。分析了塔里木盆地主要河流的河水样品δD-δ18O之间的关系以及主要离子与Cl-之间的变化关系,得出如下认识:天山南麓和盆地西南部河水样品的δD、δ18O值之间的差异主要是由同位素的高程效应引起的,昆仑山北坡河水样品的δD、δ18O值之间的差异是同位素的高程效应和大陆效应共同作用的结果;渭干河、阿克苏河、喀什噶尔河、和田河中Na+主要来源于河水对蒸发盐石盐的溶解,K+主要来自于矿物的风化过程,喀什噶尔河流域中Ca2+和SO24-主要来自于石膏的溶解,渭干河、阿克苏河、和田河流域中的Ca2+和SO24-不来源于高溶解度的矿物。

Tarim Basin is an important energy strategic base in China's inland areas,hydrogen and oxygen isotopes and water chemistry characteristics study of its surface water is of great significance for regional water resources study.The paper analysed the relationship between δD and δ18O and the relationship between main ions and Cl-of river samples in Tarim Basin.The paper pointed out that the difference between δD and δ18O of samples in south Tianshan Mountains and south-west of the Basin is mainly affected by altitude effect of isotopes and the difference between δD and δ18O of samples in north Kunlun Mountains is affected both by altitude effect and continental effect.Na+ in Weiganhe River,Akesuhe River,Kashigaerhe River and Hetianhe River derived from the dissolution of sodium chloride and K+ in these rivers derived from weathering process of minerals.Ca2+ and SO2-4in Kashigaerhe River derived from the dissolution of gypsum.Ca2+ and SO2-4in Weiganhe River,Akesuhe River and Hetianhe River doesn't derived from high soluble minerals.