重庆温塘峡背斜地表水－地下水－浅层地热水中硫同位素的环境指示意义研究  

The Environmental Significance of Sulfur Isotope in Surface Water-Ground Water-Shallow Thermal Water in Wentang Gorge Anticline,Chongqing,China

作　　者：肖琼[1,2] 杨雷[2] 蒲俊兵[1,2] 梁作兵 袁道先[1,2] 邱述兰[2] 

机构地区：[1]国土资源部广西岩溶动力学重点实验室,中国地质科学院岩溶地质研究所,广西桂林541004 [2]西南大学地理科学学院,重庆400715

出　　处：《地质学报》2016年第8期1945-1954,共10页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号:41302213);广西自然科学基金项目(编号:2013GXNSFBA019221)资助的成果

摘　　要：稳定同位素硫广泛用于示踪地下水、地表水的来源、物质组成以及水-岩作用过程。不同条件下,不同的水体中,硫同位素具有不同的环境指示意义。通过对位于我国西南川东平行岭谷区温塘峡背斜地区地表水(嘉陵江水)、矿坑水、岩溶地下河水(青木关地下河)、岩溶区浅层地下热水(北温泉水和青木关温泉水)的水化学及δ^(34)S-SO_4^(2-)的值的研究,发现嘉陵江水和姜家泉水的水化学组成显示出碳酸盐岩化学风化的特征,浅层地下热水的水化学组成反映了硫酸盐岩化学风化的特征,砂岩矿坑水既没有体现碳酸盐岩的风化也没有体现硫酸盐岩的风化。各水体的SO_4^(2-)含量与δ^(34)S-SO_4^(2-)的值揭示不同水体中硫具有不同的环境来源。嘉陵江水中的SO_4^(2-)含量与δ^(34)S-SO_4^(2-)的值表明其水的来源主要是流经地区的地表水和雨水;研究区砂岩矿坑水中SO_4^(2-)含量与δ34 SSO_4^(2-)的值表明其水是由原有矿坑水、雨水以及地表水组成;青木关岩溶地下河水中SO_4^(2-)含量与δ^(34)S-SO_4^(2-)的值表明青木关岩溶地下河水主要受到岩层、降雨以及农业活动和生活污水的影响;而浅层地下热水中SO_4^(2-)含量与δ^(34)S-SO_4^(2-)的值的示踪则反应了地下热水的储水层的水-岩作用主要是石膏的溶解。Stable isotope of sulfur is widely used to trace the water source, material composition and water rock interaction of the underground water and surface. The surface water （Jialing river）, Sand pit water, Qingmuguan Karst underground water（Jiangjia spring）, Shallow geothermal water in karst area （the North hot spring and Qingmuguan hot spring） in Wentanggorge anticline in the eastern Sichuan parallel Ridge and Valley were studied, and the chemical features of Jialing river and Jiangjia spring are showing the characteristics of the carbonate chemical weathering, however, the chemical composition of the shallow geothermal water is giving an account of the sulfate chemical weathering. It was found that sulfur isotopic tracing indicate different environmental significance in different water by the study of the SO4^2- and δ^34S-SO4^2- in these water. The concentration of SO4^2- and the value of δ^34S-SO4^2- in Jialing river indicate that the source of the Jialing river is the surface water in study area and the rain water, which in Sand pit water of study area also indicated the water source that make up by the older pit water, rain water and surface water. But the concentration of SO4^2- and the value of δ^34S-SO4^2-in Qingmuguan underground water showing that the Qingmuguan underground water is mainly effected by strata, rainfall, agriculture and domestic sewage. However, the concentration of SO42 and the tracer of δ^34S-SO4^2- appeared that the water-stone reaction of this aquifer reservoir is mainly the gypsum dissolution.

关 键 词：水化学特征 SO4^2- δ^34S-SO4^2- 地表水 地下水 重庆温塘峡 

分 类 号：X142[环境科学与工程—环境科学]