内蒙古—辽宁交界地区地下水化学类型及其成因分析  

Hydrochemical Types and the Genesis of the Ground Water in the Border Area of Inner Mongolia and Liaoning Province

作　　者：刘永梅[1] 崔月菊[2] 孙凤霞[2] 仵柯田 姜莉 刘改梅 陈立峰[1] 杜建国[2] LIU Yongmei;CUI Yueju;SUN Fengxia;WU Ketian;JIANG Li;LIU Gaimei;CHEN Lifeng;DU Jianguo(Earthquake Agency of Inner Mongolia Autonomous Region,Hohhot 010010,Inner Mongolia,China;United Laborary of High-Pressure and Earthquake Science,Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Shaanxi Institute of International Trade&Commerce,Xi an 712046,Shaanxi,China;Bayannao er Earthquake Agency,Inner Mongolia Autonomous Region,Bayannao er 015000,Inner Mongolia,China)

机构地区：[1]内蒙古自治区地震局,内蒙古呼和浩特010010 [2]中国地震局地震预测研究所高压物理与地震科学联合实验室,中国地震局地震预测重点实验室,北京100036 [3]陕西国际商贸学院,陕西西安712046 [4]内蒙古自治区巴彦淖尔市地震局,内蒙古巴彦淖尔015000

出　　处：《地震研究》2023年第1期58-67,共10页Journal of Seismological Research

基　　金：2021年度内蒙古地震局局长基金课题(2021JC05);2022年度震情跟踪定向工作任务(2022010316);2021年度河北省地震科技星火计划项目攻关项目(DZ202108090107)联合资助。

摘　　要：通过对内蒙古东部—辽宁西部地区主要活动断裂带及其周边25个泉、井、河流、水库取样点的氢氧同位素组成及主要离子含量进行测试,讨论了该地区地下水的物质来源及其与地震活动的关系。结果表明:(1)研究区地下水主要来源于大气降水。水样TDS范围为40.14~1720.87 mg/L,低矿化度(TDS<200 mg/L)水样的离子主要来源于岩石溶解和大气输入,而其它水样的离子主要来源于岩石溶解和深部流体,大气输入相对很小,但各测区深部流体的贡献有明显差别;(2)低温热水、中温热水及高温热水均为花岗岩裂隙水,其水化学类型为硫酸型和重碳酸型,富含碱性长石的火成岩溶解导致地下水富Na^(+),周围构造活动相对活跃。其中,RST水样更接近深部储水层的热水特征,表明其受深部流体影响为主;(3)NS和AES水样位于阴山北部高原区,为CO_(2)过饱和水,属重碳酸钠型;AES受干旱区季节性降水淋滤表层可溶盐、水体的蒸发以及深部富CO_(2)流体混入造成其矿化度最高;(4)KZHQ和BYNE水样分别处于碳酸盐岩含水层和含砾砂岩含水层,由于Ca^(2+)参与了矿物沉淀,水中相对富集Na^(+),形成重碳酸钠型水。在地震活动性较强的地段,地下水化学成分受深部流体的影响较大。The hydrochemical types and origins of the underground water collected from 25 hot springs(wells)at the main active fault zones in the border area between Inner Mongolia and Liaoning Province were discussed based on the isotope ratios of hydrogen and oxygen as well as ion concentrations.The results show that:(1)Values of δD and δ^(18)O range from-106.7‰ to-57.3‰ and-15.6‰ to-7.5‰,respectively,which indicate the waters have a meteoric origin.The TDS values of water samples range from 40.14 mg/L to 1 720.87 mg/L.The ions of the water samples with low salinity(TDS<200 mg/L)mainly come from rock dissolution and atmospheric input,while the ions of other water samples mainly come from rock dissolution and deep fluid.The atmospheric input is relatively small,but the contribution of deep fluid at each survey point is significantly different;(2)The low-temperature,medium-temperature and high-temperature water is all granite fissure water,and their hydrochemical types are sulfuric acid type and bicarbonate type.The dissolution of alkali-feldspar in igneous rocks leads to the enrichment of Na^(+) in groundwater,and the surrounding tectonic activities are relatively active.Among them,the RST water sample is closer to the hot water characteristics of deep water storage layer,indicating that the water sample is mainly affected by deep fluid;(3)The NS well and AES water samples from the northern plateau area of the Yinshan Mountain are CO_(2) supersaturated water,and the soda water is Na·Ca·Mg-HCO_(3) and Na·Mg-HCO_(3).AES water samples have the highest salinity due to the leaching of surface soluble salts by seasonal precipitation in arid areas,which can be attributed to meteoric water leaching soluble salts and mixture with the CO_(2)-enriched,deep fluids.(4)The KZHQ and BYNE observation well are located in carbonate rock aquifer and gravel sandstone aquifer respectively.Because Ca^(2+) participates in mineral precipitation,Na^(+) is relatively enriched in the water,forming sodium-bicarbonate-type water.The chemi

关 键 词：地下水 氢氧同位素 水化学类型 补给来源 内蒙古—辽宁交界 

分 类 号：P315.723[天文地球—地震学]