许家沟泉域岩溶地下水硫同位素特征及硫酸盐来源解析  

Sulfur isotope characteristics of karst groundwater in Xujiagou spring area and its sources

作　　者：林云[1,2] 唐敦泽 武亚遵 熊慧敏[1] 张海洋 刘源 金毅 LIN Yun;TANG Dunze;WU Yazun;XIONG Huimin;ZHANG Haiyang;LIU Yuan;JIN Yi(School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000;Henan Collaborative Innovation Center of Coal Bed(Shale)Gas in Central Plains Economic Zone,Jiaozuo 454000;The Second Geological and Mineral Survey Institute of Henan Bureau of Geology and Mineral Exploration and Development,Zhengzhou 450001,China)

机构地区：[1]河南理工大学资源环境学院,焦作454000 [2]中原经济区煤层(页岩)气河南省协同创新中心,焦作454000 [3]河南省地质矿产勘查开发局第二地质矿产调查院,郑州450001

出　　处：《干旱区资源与环境》2022年第10期158-165,共8页Journal of Arid Land Resources and Environment

基　　金：河南省高校重点科研项目(21A170011);河南省博士后基金项目(16A170012);河南省高等学校青年骨干教师培养计划(2019GGJS055,2021GGJS055)资助

摘　　要：硫酸对碳酸盐岩的溶蚀作用影响着岩溶碳汇效应,确定其分布特征及来源对估算区域岩溶碳汇量至关重要。北方太行山前岩溶泉域地下水中的硫酸盐受多因素影响,其来源及控制机制尚不清晰。为此以许家沟岩溶泉域为研究对象,利用水化学和硫氧双同位素示踪技术,分析了硫酸盐和δ^(18)O_(SO4)、δ^(34)S_(SO4)值的分布特征,解析了硫酸盐的来源,并借助IsoSource软件量化了各来源的贡献率。结果表明:泉域岩溶地下水硫酸盐含量为4.17~129.24mg·L^(-1),平均值为27.55mg·L^(-1),从裸露区到深埋区硫酸盐含量呈增大趋势;δ^(18)O_(SO4)、δ^(34)S_(SO4)值分别为4.95~7.64‰、3.60~14.02‰,平均值为6.12‰和7.27‰,δ^(18)O_(SO4)值变化不大,而δ^(34)S_(SO4)值与硫酸盐含量具有相同的变化规律,从裸露区至深埋区呈增大趋势;泉域岩溶地下水硫酸盐来源于硫化物氧化、大气降水和石膏溶解,在不同区域内它们的贡献率有所不同,平均贡献率分别为63.52%、23.46%和13.01%。研究结果可为准确评估泉域的碳汇效应提供数据支持。The dissolution of sulfuric acid on carbonate rocks affects the karst carbon sink effect,so determining the distribution characteristics and sources of sulfuric acid is crucial for estimating regional karst carbon sinks.Sulfate in groundwater of karst spring area in front of Taihang Mountains,northern China is affected by multiple factors,and its source and control mechanism are still unclear.Therefore,taking Xujiagou karst spring area as the research object,the distribution characteristics of sulfate,δ^(18)O_(SO4)andδ^(34)S_(SO4)were analyzed by using hydrochemistry and sulfur-oxygen double isotope tracing technology,and the source of sulfate was analyzed,and the contribution rate of each source was quantified by using IsoSource software.The results show that the sulfate concentration in karst groundwater in Xujiagou spring area ranges from 4.17 to 129.24mg/L,with an average value of 27.55mg/L.The sulfate concentration increases from the exposed area to the deep buried area.δ^(18)O_(SO4)andδ^(34)S_(SO4)are 4.95~7.64‰and 3.60~14.02‰,respectively,their average values are 6.12‰and 7.27‰,respectively.δ^(18)O_(SO4)changes steadily,andδ^(34)S_(SO4)increases continuously from exposed area to deep buried area.The karst groundwater sulfate in the spring area comes from sulfide oxidation,atmospheric precipitation and gypsum oxidation,and their average contribution rates are 63.52%,23.46%and 13.01%,respectively,and sulfide oxidation is the main source.The research results can provide data support for the accurate assessment of the carbon sink effect of springs.

关 键 词：硫酸盐来源 硫氧同位素 岩溶水 许家沟泉域 

分 类 号：P641[天文地球—地质矿产勘探]