Hydrochemical and Isotopic Evidence of Origin of Thermal Karst Water at Taiyuan,Northern China  

作　　者：马腾 王焰新 郭清海 闫春淼 马瑞 黄征 

机构地区：[1]Key Laboratory of Biogeology and Environmental Geology of the Ministry of Education,China University of Geosciences [2]Hubei Institute of Environmental Science

出　　处：《Journal of Earth Science》2009年第5期879-889,共11页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 40872157 and 40830748);the China-Russia International Cooperation and Exchange Project of NSFC-RFBR (No. 40711120189);Program for New Century Excellent Talents in University (No. NCET-07-0773);the Aid Project of the Ministry of Science and Technology of China to Developing Countries (No. 2008041012)

摘　　要：Thermal karst groundwaters with temperatures ranging from 32.8 to 62.5 ℃ were found at Taiyuan（太原） City,the capital of Shanxi（山西） Province.To identify the origin of the thermal groundwater,the following tracers were used in this study：δD,δ18O,4He,3He/4He,and major chemical constituents in water.Hydrochemical and isotopic data indicate that the thermal groundwaters in the basin area are a mixture of thermal waters from the West Mountain and those from the East Mountain.Furthermore,the 4He and 4Heexc concentrations of the thermal groundwater samples are usually lower than those of the cold groundwater samples,and there is an evidently negative correlation between the temperature and the 4He concentration in thermal groundwaters from the West Mountain and the ba-sin,which means that with the increase in temperature,the He concentration increases in the vapor phase and decreases in the aqueous phase.In the plot of 3He/4He vs.4He/20Ne of all water samples：air,crust,and mantle,all thermal groundwater samples are distributed near the line between the point of air and that of crust,suggesting that atmospheric and crustal helium is the main source for that in thermal groundwaters.In other words,there are no mantle-derived fluids mixed in the thermal groundwaters.Thermal karst groundwaters with temperatures ranging from 32.8 to 62.5 ℃ were found at Taiyuan（太原） City,the capital of Shanxi（山西） Province.To identify the origin of the thermal groundwater,the following tracers were used in this study：δD,δ18O,4He,3He/4He,and major chemical constituents in water.Hydrochemical and isotopic data indicate that the thermal groundwaters in the basin area are a mixture of thermal waters from the West Mountain and those from the East Mountain.Furthermore,the 4He and 4Heexc concentrations of the thermal groundwater samples are usually lower than those of the cold groundwater samples,and there is an evidently negative correlation between the temperature and the 4He concentration in thermal groundwaters from the West Mountain and the ba-sin,which means that with the increase in temperature,the He concentration increases in the vapor phase and decreases in the aqueous phase.In the plot of 3He/4He vs.4He/20Ne of all water samples：air,crust,and mantle,all thermal groundwater samples are distributed near the line between the point of air and that of crust,suggesting that atmospheric and crustal helium is the main source for that in thermal groundwaters.In other words,there are no mantle-derived fluids mixed in the thermal groundwaters.

关 键 词：thermal groundwater origin hydrochemistry isotope  ^3He/^4He Talyuan. 

分 类 号：P641.3[天文地球—地质矿产勘探]