环境同位素在识别伊犁河谷地下水补给来源中的指示作用  

INDICATION OF ENVIRONMENTAL ISOTOPES IN IDENTIFYING THE GROUNDWATER RECHARGE SOURCES IN ILI RIVER VALLEY

作　　者：邵杰[1] 李瑛[2] 李树才[1] 滕超[1] 杨欣杰 曹军[1] 陈喜庆 SHAO Jie;LI Ying;LI Shu-cai;TENG Chao;YANG Xin-jie;CAO Jun;CHEN Xi-qing(Cores and Samples Center of Natural Resources(CSCNR),CGS,Sanhe 065201,Hebei Province,China;Xi’an Center of China Geological Survey,Xi’an 710054,China)

机构地区：[1]中国地质调查局自然资源实物地质资料中心,河北三河065201 [2]中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《地质与资源》2022年第4期547-552,共6页Geology and Resources

基　　金：中国地质调查项目“新疆伊犁河谷地下水资源及环境问题调查与评价(1212011220972);新疆伊犁河谷霍城-霍尔果斯口岸水文地质调查(12120115046401);伊犁河谷西部平原区1∶5万水文地质调查(121201011000150021);实物地质资料汇集与服务(DD20190411)”.

摘　　要：重点分析了研究区潜水、浅层承压水、泉水及地表水δD、δ(18)^O的分布特征,并对5组水文钻探井地下水样品进行分析.潜水δD变化范围为-97.32‰~-67.51‰,平均值为-80.34‰;δ(18)^O为-15.85‰~-10.66‰,平均值为-12.08‰.浅层承压水δD为-111.93‰~-68.38‰,平均值为-84.79‰;δ(18)^O为-16.01‰~-10.52‰,平均值为-12.30‰.泉水δD为-102.06‰~-71.63‰,平均值为-84.10‰;δ(18)^O为-14.21‰~-9.70‰,平均值为-12.24‰.地表水δD为-90.53‰~-60.99‰,平均值为-72.58‰;δ(18)^O在-13.20‰~-9.54‰,平均值为-11.21‰.地下水δ(13)^C为-9.4‰~-5.6‰,平均值为-8.3‰,极差为3.8‰.结果表明:地下水与地表水均起源于当地大气降水.潜水与浅层承压水水力联系较强,潜水与浅层承压水属于同一含水系统.与浅层承压水相比,深层承压水年龄较大,在20 ka左右,属于沉积埋藏水.深层承压水与浅层承压水的水力联系较弱.潜水与浅层承压水的δ(13)^C值较为接近,且接近大气CO_(2)的δ(13)^C值-7‰.研究区地下水中碳的主要来源为大气CO_(2).This study analyzes the distribution characteristics ofδD andδ(18)^O in phreatic water,shallow confined water,spring water and surface water,as well as theδ(13)^C of five groups of groundwater samples from hydrologic drilling wells.The results show that both groundwater and surface water originate from the local meteoric water.The phreatic water and shallow confined water,belonging to the same aquifer system,have a strong hydraulic connection.The age of deep confined water is about 20 ka,older than the shallow confined water,belonging to sedimentary buried water,with weak hydraulic relation between the two.Theδ(13)^C values of phreatic water and shallow confined water are close to each other,approximating that of atmospheric CO2(-7‰)which serves as the main source of carbon in groundwater of the study area.

关 键 词：环境同位素 含水系统 δD-δ(18)^O关系 δ(13)^C 伊犁河谷 新疆 

分 类 号：P641.3[天文地球—地质矿产勘探]