夏河清水沟锶型饮用天然矿泉水地球化学特征及形成原因探讨  

HYDROGEOLOGICAL CHARACTERISTICS AND GENESIS OF STRONTIUM-RICH GROUNDWATER IN QINGSHUIGOU OF XIAHE COUNTY,GANSU PROVINCE

作　　者：闫旺 段凯 焦世文 李鹏举 YAN Wang;DUAN Kai;JIAO Shi-wen;LI Peng-ju(The Third Institute of Geology and Mineral Exploration,Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou 730050,China;Gansu Remote Sensing Geology Center,Lanzhou 730050,China)

机构地区：[1]甘肃省地矿局第三地勘院,甘肃兰州730050 [2]甘肃遥感地质中心,甘肃兰州730050

出　　处：《甘肃地质》2022年第2期49-57,共9页Gansu Geology

基　　金：甘肃省地质勘查基金项目“甘肃省夏河县清水沟饮用天然矿泉水资源勘查”(201502-D15)资助;甘肃省矿产资源补偿费项目“甘肃省临夏州太子山—甘南州甘加一带1∶5万矿产远景调查”资助。

摘　　要：饮用天然矿泉水是含有一定矿物质和微量元素且未受污染的地下水,富含锶元素的矿泉水对维持人体生理功能具有重要意义。依据实际调查、水文地质勘探及围岩、水质化学成分测试等数据,在阐述区域水文地质条件的基础上,深入分析了矿泉水常规离子、25种离子界限指标及污染物、微生物、放射性指标化学特征和围岩锶含量分布特征,辅以矿泉水^(3)H、^(14)C等环境同位素分析,探讨了富锶地下水形成原因。结果表明,区内广泛分布的三叠系板岩、堇青石角岩、闪长岩等围岩中形成的基岩裂隙水(含断裂带脉状裂隙水)及其循环转化形成的松散岩类孔隙水是矿泉水赋存的地下水类型,水化学类型为HCO_(3)-Ca型水,锶元素含量0.434~0.808 mg/L,TDS 60.9~395.4 mg/L,为低矿化富锶地下水;水年龄2460~2480 a,氚含量小于1.0 TU,属于大气降水入渗经深循环的远源补给;围岩是地下水中锶元素的主要母岩,地下水在径流循环过程中经过长时间的水岩互助作用,产生阳离子交换,使围岩中的锶元素被充分溶解和过滤进入含水层,从而形成富锶矿泉水。Natural mineral water for drinking is groundwater containing certain minerals and trace elements and uncontaminated,and mineral water rich in strontium is important for maintaining human physiological functions.Based on the data of actual investigation,hydrogeological exploration and tests of surrounding rocks and chemical composition of water quality,the chemical characteristics of conventional ions,25 ion limit indicators and contaminants,microorganisms and radioactive indicators of mineral water and the distribution characteristics of strontium content of surrounding rocks were analyzed in depth on the basis of the elaboration of regional hydrogeological conditions,and the causes of strontium-rich groundwater formation were explored with the supplemental analysis of environmental isotopes such as 3H and 14C of mineral water.The results show that the bedrock fracture water(including fracture zone vein fracture water)formed in the widely distributed Triassic slate,cordierite angular rocks,amphibolite and other surrounding rocks in the area and the loose rock pore water formed by its cyclic transformation are the types of groundwater endowed with mineral water,and the water chemistry type is HCO_(3)-Ca type water,with strontium element content of 0.434~0.808 mg/L,TDS 260.9~395.4 mg/L,is low mineralization strontium-rich groundwater;water age 2460~2480 a,tritium content is less than 1.0 TU,belongs to atmospheric precipitation infiltration through deep circulation of remote source recharge;surrounding rock is the main parent rock of strontium element in groundwater,groundwater in the process of runoff circulation after a long time of water-rock mutual assistance,resulting in cation exchange,so that strontium element in surrounding rock is fully dissolved and filtered into the aquifer,thus Strontium-rich mineral water is formed.

关 键 词：锶型矿泉水 形成原因 地球化学背景 水质特征 甘肃夏河 

分 类 号：P641.3[天文地球—地质矿产勘探]