新疆阿勒泰地区地表水体氢氧同位素组成及空间分布特征  

Composition and Spatial Distribution Characteristics of Hydrogen and Oxygen Isotopes of Surface Water in Altay,Xinjiang Province

作　　者：高娟琴 于扬[2] 王登红[2] 王伟 代鸿章 于沨 秦燕[2] GAO Juan-qin;YU Yang;WANG Deng-hong;WANG Wei;DAI Hong-zhang;YU Feng;QIN Yan(School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Metallogeny and Mineral Assessment,Ministry of Natural Resources,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Geology and Mineral Resources Scientific Institute,Sichuan Exploration Bureau of Geology and Mineral Resources,Chengdu 610036,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]自然资源部成矿作用与资源评价国家重点实验室,中国地质科学院矿产资源研究所,北京100037 [3]四川省地质矿产勘查开发局地质矿产科学研究所,四川成都610036

出　　处：《岩矿测试》2021年第3期397-407,共11页Rock and Mineral Analysis

基　　金：中国地质调查局地质调查项目(DD20190173)。

摘　　要：氢氧同位素可以识别水体来源,示踪水循环,自20世纪50年代以来已被广泛应用于水文地球化学领域。已有学者开展了新疆大气降水及部分河流湖泊的稳定同位素研究,而关于阿勒泰地区大气降水之外的地表水体稳定同位素研究尚需加强。本文采用液体水激光同位素分析法开展了新疆阿勒泰地区地表河水、湖泊、山泉水、雪水、锂矿坑裂隙水五类水体的氢氧同位素组成研究。结果表明:阿勒泰地区各种类型水体氢氧同位素组成差异明显,地表河流的δ^(18)O及δD值变化范围分别为-15.4‰~-11.5‰及-114‰~-100‰,氘过量参数(d值)变化范围为-12.4‰~12.4‰;乌伦古湖湖水的δ^(18)O及δD值均远高于地表河流,平均值分别为-5.95‰及-78.5‰,氘过量参数远低于地表河流,均值为-30.9‰。地表河流与全球及乌鲁木齐大气降水线相比差异很大,河水除了大气降水外还受到冰川融水的补给,且在水循环过程中经历了蒸发分馏作用,地表河流之间的氢氧同位素组成差异主要受水体补给来源及蒸发程度强弱的控制。由于氢氧同位素温度效应、纬度效应等的存在,阿勒泰地区水体δD及δ^(18)O与水温(T)、总溶解性固体(TDS)及主要离子Na^(+)、K^(+)、Ca 2^(+)、Cl-、SO_(4)^(2-)摩尔浓度呈显著正相关关系,而与采样点纬度及溶解氧含量(DO)呈显著负相关关系(P<0.05,n=32)。本研究获得的氢氧同位素组成特征为阿勒泰地区各类型水体稳定同位素研究提供了基础数据。BACKGROUND:Hydrogen and oxygen isotopes can be used to identify water sources and trace water cycles and have been used in hydrogeochemistry since the 1950s.Studies have been carried out on stable isotopes of atmospheric precipitation,rivers and lakes in Xinjiang.However,the research on hydrogen and oxygen isotopes of waters in Altay is scarce,except for atmospheric precipitation.Researchers found that the rainfall in the Altai Mountains during the warm season(April—October)increased significantly from 1959 to 2014.Due to this background of climate condition changes,it is meaningful to study the hydrogen and oxygen isotope compositions of various types of water bodies in the Altay region,at the southern foot of the Altai Mountains.OBJECTIVES:To obtain the basic data of hydrogen and oxygen isotopic composition of water in Altay and reveal their spatial distribution characteristics.METHODS:Hydrogen and oxygen isotope compositions of river water,lake water,spring water,snow water,and water from a mine pit in the Altay region of Xinjiang were determined by liquid water laser isotope analyzer(LGR DT100,America).The dissolved oxygen(DO),TDS,T,and pH of the water samples were measured using the German WTW3430 multi-parameter water quality analyzer.The concentrations of Na^(+),K^(+),Ca 2^(+),and Mg 2^(+)were analyzed by inductively coupled plasma-optical emission spectrometry(PE8300,PerkinElmer,USA).The concentrations of HCO-3 and CO2-3 were determined by alkali titration method.Cl-and SO_(4)^(2-) concentrations were analyzed by ion chromatography method.RESULTS:The results showed that the ranges of δ^(18) O andδD of the waters in the Altay area were from-15.4‰to-5‰and from-121‰to-49‰,respectively.The hydrogen and oxygen isotope content of various types of water in the Altay region were significantly different.Theδ^(18) O and δD values of river waters varied from-15.4‰to-11.5‰and from-114‰to-100‰,respectively,and the deuterium excess parameter varied from-12.4‰to 12.4‰.Theδ^(18) O andδD of Ulu

关 键 词：地球化学 地表水 氢氧同位素 氘过量参数 空间分布特征 

分 类 号：S482[农业科学—农药学]