湘西北地区岩溶地下水水化学与氘氧同位素特征分析  

Analysis on D/18O and hydrochemical characteristics of karst groundwater in northwestern Hunan Province

作　　者：廖驾 朱振华 彭毅 韦珊瑚 罗朝晖[2] 刘状 徐强强 谢亘 LIAO Jia;ZHU Zhenhua;PENG Yi;WEI Shanhu;LUO Zhaohui;LIU Zhuang;XU Qiangqiang;XIE Gen(Changsha General Survey of Natural Resources Centre,China Geological Survey,Changsha,Hunan 410600,China;School of Environmental Studies,China University of Geosciences,Wuhan,Hubei 430074,China;Langfang General Survey of Natural Resources Centre,China Geological Survey,Langfang,Hebei 065000,China)

机构地区：[1]中国地质调查局长沙自然资源综合调查中心,湖南长沙410600 [2]中国地质大学(武汉)环境学院,湖北武汉430074 [3]中国地质调查局廊坊自然资源综合调查中心,河北廊坊065000

出　　处：《中国岩溶》2023年第3期425-435,481,共12页Carsologica Sinica

基　　金：中国地质调查局项目(DD20211557,ZD20220309)。

摘　　要：湘西北地区岩溶地下水水化学研究是地下水资源合理开发与利用的保证,文章在全面采集区内地下水水样进行水化学和同位素分析的基础上,利用氘氧同位素和综合水文地球化学研究方法对该区地下水的来源与组分成因进行探讨。结果表明:(1)研究区内岩溶水化学特征整体上三个区之间差异不大,但各区之间地下水组分的来源与成因仍有较大的不同,其主要来源于碳酸盐岩矿物的溶滤,并伴有不同程度的石膏等其他矿物溶滤,在龙山地区(I区)以方解石/白云石、石膏溶滤为主;永顺—凤凰地区(Ⅱ区)内,酉水流域地下水主要以白云岩溶滤为主;武水流域地下水中钙镁离子浓度受灰岩、白云岩溶滤作用共同影响。石门地区(Ⅲ区)主要离子来源于灰岩溶滤,地下水中钠钾离子、氯离子有多种来源;(2)研究区内氘氧同位素体现出明显的大陆效应和高程效应,泉相对井和暗河地下水系统具有相对封闭性,氘盈余则反映泉相对于暗河是一种快循环、短停留时间的系统。Understanding hydrochemistry of karst water in northwestern Hunan is the foundation for reasonable utilization of water resources.The study on the causes of water sources and the evolution process of solute components is of great scientific value and practical significance.However,most of the research on this area has focused on the optimal allocation of water quantity and the evaluation of local water quality in the past few years.There is lack of research on hydrological geochemical characteristics and control factors based on groundwater systems,and hence a need of further research on the systematic understanding and utilization of local karst groundwater.This study takes the karst water system in northwestern Hunan Province as a case,aiming to reveal the characteristics,the evolution law and causes of hydrochemistry in this area.The research findings are hoped to play a positive guiding role in the sustainable development,and utilization and integrated management of regional groundwater resources.On the basis of hydrochemical and isotopic analyses of water samples collected in the study area,the source and composition origin of groundwater in this area have been explored with isotope D and 18O and with the comprehensive hydrogeochemical research method of multivariate statistics and hydrochemistry(piper trilinear diagram and ion scale coefficient).The results show that although there is little difference among three study zone on the whole,the sources and genesis of groundwater components are still quite different.According to the pipper three-line chart and the Gibbs chart,it can be seen that the main component of groundwater mainly derives from the dissolution and leaching of carbonate,accompanied by different degrees of the leaching of gypsum and other minerals.Concentrations of potassium,sodium ions and chloride ions are generally low,which is related to the low content of salt rocks in the carbonate formation and weak effect of evaporative concentration.Because the alternating adsorption of cations is we

关 键 词：岩溶地下水 水化学特征 氘氧同位素 湘西北地区 

分 类 号：P641.134[天文地球—地质矿产勘探]