赣南横径地区碳酸温泉CO_2成因研究  

A Study of the CO_2 genesis of the carbonated hot springs in Hengjing, southern Jiangxi

作　　者：张卫民[1] 王焰新[1] 孙占学[2] 

机构地区：[1]中国地质大学,武汉430074 [2]东华理工学院,抚州344000

出　　处：《水文地质工程地质》2005年第6期6-9,共4页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助项目(40472147)

摘　　要：本文在分析横径温泉区4个气样的气体组分、氦同位素以及CO2和CH4的碳同位素基础上,结合温泉区地质条件,研究了该区碳酸温泉中CO2的成因。研究结果表明:横径温泉区温泉气中CO2的含量很高(>96%),CO2气体中1δ3C较重(-5.53‰^-4.43‰),属于与深大断裂活动有关的深部幔源无机成因气;温泉气中CH4的含量很低(<1.86%),CH4气体中1δ3C较轻(-27.69‰^-59.31‰),其中39、和11号温泉气体中的CH4属于深部幔源无机CH4和源于地表生物成因CH4的混合,而2号温泉气体中的CH4属于深部幔源无机CH4。On the basis of the analysis of the geological conditions and the gas composition, helium isotopic composition, and carbon isotopic abundance of carbon dioxide and methane for 4 gas samples taken from the Hengjing hot springs area, the CO2 genesis of carbonated hot springs is examined. The CO2 concentrations of geothermal gases is higher than 96%, and the δ^13 C values of CO2 range from - 5.53‰ to - 4.43‰, indicating that the CO2 is resulted from the inorganic mantle source gas related to the deep-reaching active faults. The CH4 concentrations of geothermal gases is less than 1.86%, and the δ^13C values of CH4 range from -27.96‰ to -59.31‰, indicating that the CH4 of No.3, No.9 and No. 11 geothermal gas samples is resulted from a mixture of the deep inorganic mantle source CH4 and surface biogenetic CH4, but the CH4 of No. 2 geothermal gas is resulted from the deep inorganic mantle source CH4.

关 键 词：碳酸温泉 CO2成因 碳同位素 氦同位素 

分 类 号：P641.5[天文地球—地质矿产勘探] P641.3[天文地球—地质学]