运用H、O同位素分析石阡地区地热水来源

通过对贵州省石阡地区地热水、冷泉及河流的地热地质条件、水化学成分及氢氧同位素分析,对该地区的地热水、冷泉及河流的水化学特征、来源及石阡地区的补给模式进行了研究.温泉水属于低中矿化度的弱碱性水;温泉群中阳离子以Ca2+、Mg2+为主,阴离子以SO42-和HCO3-为主,研究区水化学类型主要为HCO3-Ca和SO4.HCO...

Analysis of Geothermal Water Source by H and O Isotopes in Shiqian Area

Based on the analysis of geothermal and geological conditions,chemical composition,hydrogen and oxygen isotopes of geothermal water,cold springs and rivers in the Shiqian area,Guizhou Province,this paper studied the hydrochemical characteris-tics,sources and recharge modes.Hot spring water belongs to the weak alkaline water with low and medium salinity.Ca^2+and Mg^2+are the major cations while SO4^2-and HCO3^-are the main anions in hot spring group,and the main hydrochemical types are HCO3-Ca and SO4.HCO3-Ca.The values ofδ18O andδD are-9.32‰-6.81‰and 64.4‰-44.9‰respectively in hot water,and7.51‰-6.00‰and-50.7‰-38.2‰respectively in cold springs and rivers,which are distributed near the atmospheric precipitation line and the local atmospheric precipitation line in China.It is speculated that the recharge area could be the exposed carbonate rock area near the Paomuzhai anticline and the Hongshi strike-slip fault and its fault bundle.Deuterium surplus parameter d indicates characteristics of shallow depth in most geothermal water,short time of circulation runoff,relatively weak water-rock reaction and the geological environment is between open and semi-open in the Shiqian area.