| Distribution of δ~(34)S and δ~(18)O in SO_4~(2-) in Groundwater from the Ordos Cretaceous Groundwater Basin and Geological Implications |
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| 作者姓名： | YANG Yuncheng SHEN Zhaoli WEN Dongguang HOU Guangcai SHE Hongquan ZHAO Zhenhong WANG Dong and LI Jingwen |
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| 作者单位： | YANG Yuncheng(Institute of Mineral Resources, Chinese Academy of Sciences, Belting 100037, China;Xi'an institute of Geology and Mineral Resources, Xi'an 710054, China);SHEN Zhaoli,WEN Dongguang(China University ofGeosciences, Beijing 100083, China);HOU Guangcai(Xi'an institute of Geology and Mineral Resources, Xi'an 710054, China);SHE Hongquan,ZHAO Zhenhong,WANG Dong,LI Jingwen(Institute of Mineral Resources, Chinese Academy of Sciences, Belting 100037, China) |
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| 基金项目： | This research was financially supported by the China Geological Survey (grant No.1212010331302), National Science and Technology Project (grant No. 2006BAB01A10) and International Atomic Energy Agency (grant No.CPR8012, CPR8017). |
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| 摘 要： | <正>The Ordos Cretaceous Groundwater Basin,located in an arid-semiarid area in northwestern China,is a large-style groundwater basin.SO_4~(2-) is one of the major harmful components in groundwater.Dissolved SO_4~(2-) concentrations,andδ~(34)S-SO_4~(2-) andδ~(18)O-SO_4~(2-) in groundwater from 14 boreholes and in gypsum from aquifer were analyzed.Results show that SO_4~(2-) in shallow groundwaters originates from precipitation,sulfide oxidation,and dissolution of stratum sulphate,with a big range ofδ~(34)S values,from-10.7‰to 9.2‰,and addition of SO_4~(2-) in deep groundwater results from dissolution of stratum sulphate,with biggerδ~(34)S values,from 7.8‰to 18.5‰,compared with those in shallow groundwater.This research also indicates that three types of sulphate are present in the strata,and characterized by highδ~(34)S values and highδ~(18)O values-style,highδ~(34)S values and middleδ~(18)O valuesstyle, middleδ~(34)S values and lowδ~(18)O values-style,respectively.Theδ~(34)S-SO_4~(2-) andδ~(18)O-SO_4~(2-) in groundwater have a good perspective for application in distinguishing different groundwater systems and determining groundwater circulation and evolution in this area.
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| 关 键 词： | 浅层地下水 鄂尔多斯盆地 硫酸盐 白垩系 地质意义 硫化物氧化 地下水系统 酸溶解 |
| 收稿时间： | 9/8/2008 12:00:00 AM |
| 修稿时间： | 2009/11/27 0:00:00 |
Distribution of δ~(34S) and δ~(18)O in SO~(2-)_4 in Groundwater from the Ordos Cretaceous Groundwater Basin and Geological Implications |
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| Authors: | YANG Yuncheng SHEN Zhaoli WEN Dongguang HOU Guangcai SHE Hongquan ZHAO Zhenhong WANG Dong LI Jingwen |
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| Institution: | 1. Institute of Mineral Resources, Chinese Academy of Sciences, Beijing 100037, China;2. Xi'an institute of Geology and Mineral Resources, Xi'an 710054, China;3. China University of Geosciences, Beijing 100083, China;4. China Geological Survey, Beijing 100011, China |
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| Abstract: | The Ordos Cretaceous Groundwater Basin, located in an arid‐semiarid area in northwestern China, is a large‐style groundwater basin. SO2?4 is one of the major harmful components in groundwater. Dissolved SO2?4 concentrations, and δ34S‐SO2?4 and δ18O‐SO2?4 in groundwater from 14 boreholes and in gypsum from aquifer were analyzed. Results show that SO2?4 in shallow groundwaters originates from precipitation, sulfide oxidation, and dissolution of stratum sulphate, with a big range of δ34S values, from ?10.7‰ to 9.2‰, and addition of SO2?4 in deep groundwater results from dissolution of stratum sulphate, with bigger δ34S values, from 7.8‰ to 18.5‰, compared with those in shallow groundwater. This research also indicates that three types of sulphate are present in the strata, and characterized by high δ34S values and high δ18O values‐style, high δ34S values and middle δ18O values‐style, middle δ34S values and low δ18O values‐style, respectively. The δ34S‐SO2?4 and δ18O‐SO2?4 in groundwater have a good perspective for application in distinguishing different groundwater systems and determining groundwater circulation and evolution in this area. |
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| Keywords: | sulphate sulfide suffur isotope oxygen isotope Ordos Groundwater Basin |
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