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《Acta Geologica Sinica》 2007-03
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Characteristic of Strontium Isotope of Groundwater and Its Application on Hydrology in The Ordos Cretaceous Artesian Basin

YANG Yuncheng1,2),WENG Dongguang3),HOU Guangcai2), ZHANG Maosheng2), PANG Zhonghe4), WANG Dong2) 1) China University of Geosciences, Beijing 100083; 2) Xi′an institute of Geology and Mineral Resources, Xi′an 710054, China; 3) China Geological Survey Bureau, 100011;4) International Atomic Energy Agency, Vienna, Austria Correspondence should be addressed to Yang Yuncheng  
The north district in the Ordos Cretaceous Artesian Basin is desert plateau. And the south district is loess plateau. Agriculture and stock raising are the main economical forms. The pollution in this area is not very prominent, so the strontium and its isotope can be here used to study the water-rock reaction and the evolution of the groundwater. The analyzing results of 20 strontium samples from this basin show that: the 87Sr/86Sr ratios of the groundwater are not uniform regionally. The 87Sr/86Sr ratios(0.711002~0.711570)in the southwest area are bigger than that of the other area (0.710378~0.710646). In local system, the strontium concentration of the groundwater, which depth is less than 100 m, is relatively smaller, and the 87Sr/86Sr is relatively bigger. However, the strontium concentrations of the groundwater, which depths are more than 100 m, is relatively bigger, and the 87Sr/86Sr ratios are relatively smaller. And following the pathway of the groundwater the strontium concentrations become bigger and bigger. The strontium concentration of Subeinao lake water is relatively smaller and the 87Sr/86Sr ratio is relatively bigger, which are identical with shallow groundwater, so the origin of Subeinao lake water is from shallow groundwater.
【Fund】: 国土资源大调查项目“鄂尔多斯盆地地下水勘查”(编号1212010331302);; 国际原子能机构合作项目(编号CPR8012 CPR8017)资助成果。
【CateGory Index】: P641.1
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