新疆帕米尔高原塔什库尔干地区冰川融水锶同位素特征及其环境意义

发布时间：2018-07-12 08:41

本文选题：帕米尔高原 + 塔什库尔干　；参考：《环境化学》2017年04期

【摘要】：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HCO_3-Ca(Ca-Mg)和HCO_3-SO_4-Ca-Mg水为主;冰川融水矿化度低,水化学类型简单,NO_3~-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~(18)O和~2H具有明显的高度效应,δ~(18)O-δ~2H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~(18)O和~2H同位素特征;本研究应用~(87)Sr/~(86)Sr比值与1/[Sr~(2+)]相关性以及~(87)Sr/~(86)Sr、[Sr~(2+)]/[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~(87)Sr/~(86)Sr比值和低[Sr~(2+)]/[Na~+]比值,南部是以碳酸盐岩为主的分布区,其特征是低~(87)Sr/~(86)Sr比值和高[Sr~(2+)]/[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~(87)Sr/~(86)Sr比值和高的1/[Sr~(2+)]比值为特征,而下游则以低~(87)Sr/~(86)Sr比值和小的1/[Sr~(2+)]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.
[Abstract]:The characteristics of Sr isotopic composition of glacier melt water in the Pamirs plateau are studied and discussed with the results of Hydrochemistry and hydrogen and oxygen isotopes. The results show that the area is mainly HCO_3-Ca (Ca-Mg) and HCO_3-SO_4-Ca-Mg water, and the glacier melt water mineralization is low, the hydrochemical type is simple, and the content of the NO_3~- ion is very little. It is a study of the glacier melting water and oxygen. The isotopic characteristics and the ideal area for the study of water rock interaction with strontium isotopes. The ~ (18) O and ~2H of glacial melting water have obvious height effects. The delta ~ (18) O- Delta ~2H relation is located at the top left of the world precipitation line, showing the ~ (18) O and ~2H isotopic characteristics of glacial melting water under cold climate conditions; this study applies the ratio of ~ (87) Sr/~ (86) Sr to the present study. The correlation between value and 1/[Sr~ (2+)] and the correlation of ~ (87) Sr/~ (86) Sr and [Sr~ (2+)]/[Na~+] ratio found that the area of the kkkkuru River in the upper reaches of the upper reaches of the kshurgan river basin is dominated by silicate rocks, characterized by high ~ (87) Sr/~ (86) Sr ratio and low [Sr~ (2+)]/[Na~+] ratio, and the south is a carbonate dominated distribution area. It is characterized by the ratio of low ~ (87) Sr/~ (86) Sr and high [Sr~ (2+)]/[Na~+]; to the middle and lower reaches, the river is mixed water, which is characterized by the ratio of low ~ (87) Sr/~ (86) Sr ratio and high 1/[Sr~ (2+)) to the upstream water point, while the downstream is characterized by the ratio of low ~ (87) Sr/~ (86) Sr and small 1/[Sr~). These characteristics are with mixed water. It is also found that the D value of deuterium excess parameter is an important indicator for identifying the recharge of water or groundwater by precipitation, and can be used to study the evolution of paleoclimate in this area.
【作者单位】：中国地质环境监测院;天津市地质调查研究院;河南省地质环境规划设计院有限公司;
【基金】：国家自然科学基金(41402221) 中国博士后科学基金(2013M540999)资助~~
【分类号】：P597;P342

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