Chemical and Isotopic Characteristics and Genesis of Typical Geothermal Hot Springs in Changdu Area of Eastern Tibet
Based on the geothermal geological background of Changdu area in Tibet,this paper comprehensively uses field geological survey,hydrogeochemistry,environmental isotope methods,and combined with the geochemical characteristics of spring,explores the development characteristics and genetic mechanism of typical geothermal hot springs exposed in the Nujiang fault zone,Lancang River fault zone,and Jinsha River fault zone.The results showed that the changes in the chemical constant components of Xiali Hot Spring(about 31.6℃),Enda Hot Spring(about 12.7 ℃),Niangqu Hot Spring(about 10.8 ℃),Qudeng Hot Spring(about 55.9℃),Awang Hot Spring(about 78.6 ℃)and their surrounding rivers were basically consistent,and the water chemical content values of hot spring water were generally higher than those of river water.The cations in spring water are mainly Ca2*,Mg2*,and Na+,while the anions are mainly HCO3-and SO42-.The hydrochemical types of hot spring water are HCO3-Ca·Mg type,HCO3·SO4-Ca·Mg type,or HCO3-Na type.The hydrochemical types of hot spring water show certain differences from those of surrounding surface cold water.The water rock interaction of the five hot springs is mainly controlled by rock leaching.Through comparative analysis of five typical hot spring genesis models,the common feature is that all five hot spring origins are controlled by fault zones.The difference is that Xiali Hot Springs,Enda Hot Springs,and Niangqu Hot Springs are karst springs with relatively low temperatures.Qudeng Hot Springs and Awang Hot Springs are sandstone or gravel springs with relatively high temperatures.
geothermal hot springseastern Tibethydrogeochemistrystable isotopes of hydrogen and oxygensinter
万方数据
维普
