江西省横迳温泉区地热气体地球化学  

GEOTHERMAL GAS GEOCHEMISTRY OF THE HENGJINGHOT SPRINGS AREA IN JIANGXI PROVINCE

作　　者：孙占学[1] 高柏[1] 刘金辉[1] 

机构地区：[1]东华理工学院土木与环境工程系,江西抚州344000

出　　处：《现代地质》2004年第1期116-120,共5页Geoscience

基　　金：国家自然科学基金资助项目(40242018)。

摘　　要：从赣南横迳温泉区采集10个水样并分析了温泉及冷泉的水化学成分,认为热水起源于大气降水补给。在此基础上,还在温泉区采集了4个气样,测定了气体组分的含量及氦同位素,以及CO2和CH4的碳同位素。研究结果表明:横迳地区温泉气中CO2的含量很高较重(-4 43‰～-5 50‰),属幔源CO2;He同位素特征值(R/Ra)变(>96%),δ13CCO2化于1 36～2 11之间,均大于l,有幔源He的加入;本区温泉气的的组合类型为二氧化碳幔源温泉气,从整体上来说属于幔源无机成因气,是地幔脱气的产物。In the Hengjing hot springs area, southern Jiangxi Province, 10 samples taken from hot springs and cold springs are analyzed for hydrochemistry. Evidences show that the geothermal waters in the area are of meteoric origin. Gas chemistry, helium isotopic composition, and carbon isotopic abundance of carbon dioxide and methane for 4 gas samples from hot springs are measured. The CO_2 concentrations of the geothermal gases is higher than 96%, and the δ^(13)C values of CO_2 range from -4.43‰ to -5.5‰ indicate that the CO_2 come from the mantle. The helium isotopic ratios ~3 He/ ~4 He for the hot spring gases changing from 1.36Ra to 2.11Ra suggest that the mantle helium input may exist in the geothermal system of the study area. The hot spring gases in the area are categorized into the mantle CO_2 type gases that are the mantle inorganic gases produced by degassing of the mantle.

关 键 词：温泉 氦同位素 碳同位素 地热地球化学 

分 类 号：P641[天文地球—地质矿产勘探]