【摘要】 为了探究甘肃东南部温泉的成因,通过气体地球化学的方法研究对比了该区温泉、冷泉和地表水中溶解气的组分及其同位素特征。结果表明:陇东南地区出露的温（冷）泉和地表水具有相似的气体组分特征,均以氮气为主（介于70. 47%～78. 33%）;温泉水的δD～δ¹⁸O数据点沿着兰州大气降水线分布,没有明显漂移;δ¹³C_CO2特征和CO₂含量表明CO₂属于有机生物成因。可见陇东南地区温泉水与深部围岩的同位素交换作用不强,温泉水的来源属于大气降水补给。其形成可能是地表水在深循环过程中受热后,由于频发的地震产生有利于地下水和温泉气上升、运移的通道,使的泉水沿裂隙溢出而来。更多还原

【Abstract】 In order to explore the causes of hot springs in southeast of Gansu Province,the composition and isotopic characteristics of gases which dissolved in hot springs,cold springs and surface water were studied.The results show that the hot springs have the same gas composition as cold springs and surface water,all of which are composed of dominant N₂（70.47%～78.33%）.Besides,theδD-δ¹⁸O line of hot spring water distribute along the Lanzhou atmospheric precipitation line,and no obvious drift.Theδ¹³C value and content of CO₂ indicate that CO₂ mainly from biogenic hydrocarbon gas.It is concluded that the hot spring water origin from atmospheric precipitation,after heated by geothermal energy during the deep circulation,then rising to the surface by fracture which caused by the tectonic activity.更多还原