Tracing natural and anthropogenic sources of dissolved sulfate in a karst region by using major ion chemistry and stable sulfur isotopes

详细信息    查看全文

• 作者：Yun-Chao Lang^a ; Cong-Qiang Liu ; ^a ; ^{liucongqiang@vip.skleg.cn"" rel=""nofollow} ; Si-Liang Li^a ; Zhi-Qi Zhao^a ; Zhi-Hua Zhou^a
• 刊名：Applied Geochemistry
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：26
• 期：Complete
• 页码：S202-S205
• 全文大小：372 K

文摘

This paper presents hydrogeochemical and S isotopic characteristics of karstic surface and ground water in the karstic aquifers of Zunyi city of Guizhou Province, SW China. The average δ³⁴S value of SO₄ is +2.2‰ (n = 28) in ground waters and +7.0‰ (n = 15) in surface waters in the low flow season, while in the high flow season it is +1.0‰ in ground waters and +2.8‰ in surface waters. Natural and anthropogenic sources of the dissolved can be discriminated by a combined approach using water chemistry and stable S isotope data. A pollutant source of SO₄ is estimated to have very high TDS contents and a narrow range of δ³⁴S values (0‰ to +5.0‰). The water with a distinctively high δ³⁴S value of +30.5‰ originates from an evaporite (gypsum and anhydrite)-bearing aquifer, and the δ³⁴S values lower than −10‰ suggest an origin by oxidation of sulfide minerals in coal seams with intermediate TDS contents.