贵阳市乌当区地下热水水文地球化学过程研究

根据贵阳市乌当区地下热水的相关化学组成,对该区热水的水文地球化学过程进行了研究。研究表明,热水中Ca2+、SO42-、偏硅酸和氟的含量比较高,各离子含量受地层岩性中相关矿物溶解作用的控制,水温的增加有利于大部分矿物水-岩作用的进行。Ca2+来源于方解石、白云石及石膏的溶解;SO42-除石膏溶解外,部分来源于深部H2S气体的氧化;Na+与岩盐溶解和钠长石的水解作用有关;氟主要来自萤石矿物的溶解,同时碳酸盐矿物沉淀作用促使萤石溶解;硅来源于石英和玉髓等矿物的溶解,锶的浓度主要受菱锶矿和天青石矿物溶解的控制。

The study of hydrogeochemical process of geomothalwater in Wudang district,Guiyang City

According to the related chemical composition of geomothalwater in Wudang district,Guiyang,hydrogeochemical processes of geomothalwater in the area has been studied.The results show that geomothalwater are rich of Ca2+,SO42-,metasilicate,and fluoride.The ion content was under the control of dissolution of minerals in the stratum,water temperature is beneficial for most of water-rock interaction of minerals.Ca2+ is from the dissolution of calcite,dolomite and gypsum.Part of SO42-comes from the dissolution of gypsum,the other part comes from the oxidation of deep H2S gas.Na+ has relative with the dissolution of rock salt and hydrolysis of sodium feldspar;fluorine comes from the dissolution of fluorite,and precipitation of carbonate minerals promotes fluorite dissolve;silicon originates from the dissolution of quartz and chalcedony and other minerals.Strontium concentration is mainly affected by the dissolution of strontianite and celestite.