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本文研究了帕米尔高原地区冰川融水的Sr同位素组成特征,并且结合水化学和氢氧同位素结果进行讨论.结果表明,该区以HCO3-Ca (Ca-Mg)和HCO3-SO4-Ca-Mg水为主;冰川融水矿化度低,水化学类型简单,NO3-离子含量很少,是研究冰川融水氢氧同位素特征和用锶同位素研究水-岩作用的理想地区.研究区冰川融水的18O和2H具有明显的高度效应,δ18O-δ2H关系水点均位于世界降水线的左上方,显示了寒冷气候条件下,冰川融水18O和2H同位素特征;本研究应用87Sr/86 Sr比值与1/[Sr2+]相关性以及87Sr/86Sr、[Sr2+]/[Na+]比值的相关性发现,塔什库尔干河流域的上游西南部喀喇其库尔河一带是以硅酸盐岩为主的分布区,其特点是高87Sr/86Sr比值和低[Sr2+]/[Na+]比值,南部是以碳酸盐岩为主的分布区,其特征是低87Sr/86Sr比值和高[Sr2+]/[Na+]比值;到了中游和下游,河水都是混合水,其中靠近上游水点以低87Sr/86Sr比值和高的1/[Sr2+]比值为特征,而下游则以低87Sr/86Sr比值和小的1/[Sr2+]比值为特征,这些特点与混合水的来源和流经区的岩性有关;本研究还发现,氘过量参数d值是识别大气降水补给河水或地下水的重要指标,可用于研究该地区古气候的演变.

In this paper,we studied the characteristics of Sr isotopic composition of glacial melt water in the Pamirs region,and discussed the combined water chemistry and hydrogen and oxygen isotope results.The results show that the water chemical type are HCO3-Ca(Ca-Mg) and HCO3-SO4-Ca-Mg.Glacier water mineralization degree is low,and the water chemistry type is simple.What's more,it has a rarely NO3-ion content.So,this area is the ideal area to study the strontium isotope of water rock interaction and hydrogen oxygen isotope characteristics of glacial melt water.The 18O and 2H of glacier melt water in the study area have obvious height effect.The relationship of water points of δ18O-δ2H are on the top left of the precipitation line.It shows the characteristics of 18O and 2H in the cold climate conditions.This study applied87Sr/86Sr ratio and the relativity of 1/[Sr2+] ratio,and the relativity of 87Sr/86Sr ratio and [Sr2+]/[Na+] ratio,found that Tashikuergan river drainage area upstream southwest kalaqi Kur river area is dominated by silicate rock distribution.It is characterized by high 87Sr/86Sr ratio and low [Sr2+]/[Na+] ratio.The southern part is dominated by carbonate rocks,characterized by low 87Sr/86Sr ratio and high [Sr2+]/[Na+] ratio.In the middle and lower reaches,the river is the mixed water,with low near the upstream water points among them 87Sr/86Sr ratio and high ratio of 1/[Sr2+] was characterized,and downstream at low 87Sr/86Sr ratio and small ratio of 87Sr/86Sr,characterized by these characteristics associated with the sources and flows through the lithology of the mixed water.This study also found that the deuterium excess parameter d is an important index to identify the recharge of the river water or groundwater.It can be used to study the evolution of the ancient climate in the region.