硫氧同位素在识别辛安泉域岩溶水SO_(4)^(2-)来源中的应用

Application of sulfur and oxygen isotopes in identifying the source of sulfate in karst water from Xin′an spring area

硫酸盐超标是辛安泉域岩溶水水质恶化的主要现象之一。识别岩溶水中硫酸盐的来源对于全面理解岩溶水水文地球化学过程,合理开发利用和保护岩溶水资源具有重要意义。通过野外水文地质调查、水样采集和水化学同位素测试,采用硫氧双同位素示踪技术,分析识别了辛安泉域岩溶水中硫酸盐的物质来源。研究结果表明,泉域内岩溶水中的硫酸盐主要来源于石膏溶解、地表水渗漏和矿坑水入渗,且以石膏溶解和地表水渗漏混合居多。研究成果为辛安泉域岩溶水资源的保护与合理开发利用提供了重要的环境和水文地质学依据。

An extremely high sulfate content is one of the main reasons for the deterioration of karst water quality in the Xin′an Spring area.Identifying the source of sulfate is of great significance for fully understanding the hydrogeochemical process in karst water and for the rational development,utilization and protection of karst water resources.In this work,the source of sulfate in karst water from the Xin′an Spring area is identified by sulfur and oxygen isotope.These results show that the sulfate in karst water mainly comes from gypsum dissolution,surface water leakage and pit water infiltration,and gypsum dissolution and mixing with surface water is the majority.This study provides important environmental and hydrogeological information for the protection,rational development and utilization of karst water resources in the study area.