Genesis of Sr Isotopes in Groundwater of Hebei Plain

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• 作者：Ye Ping ; Zhou Aiguo ; Liu Cunfu ; Cai Hesheng ; Can Yiqun ; Li Xiaoqian ; Jin Qinsheng
• 关键词：strontium ; ⁸⁷Sr/⁸⁶Sr ; groundwater ; Hebei plain
• 刊名：Journal of China University of Geosciences
• 出版年：2007
• 出版时间：June 2007
• 年：2007
• 卷：18
• 期：2
• 页码：177-184
• 全文大小：721 K

文摘

To analyze the genesis of Sr isotopes in groundwater of Hebei plain, time-accumulative effect of ⁸⁷Sr/⁸⁶Sr ratio was studied. It is shown that ⁸⁷Sr/⁸⁶Sr ratio increases with the increasing age and depth of groundwater and has a positive correlation to ⁴He_ece and a negative correlation to δ¹⁸O and δD. The groundwater is divided into three groups to discuss the relation between ⁸⁷Sr/⁸⁶Sr ratio and Sr²⁺ content: moderate Sr²⁺ content and higher ⁸⁷Sr/⁸⁶Sr ratio (water I); lower Sr²⁺ content and higher ⁸⁷Sr/⁸⁶Sr ratio (water II); and higher Sr²⁺ content and lower ⁸⁷Sr/⁸⁶Sr ratio (water III), that is hot water. On the basis of integrated analysis, it was considered that the radiogenic Sr in the Quaternary groundwater (Q₄-Q₁) originates from weathering of silicate rich in Na and Rb, mainly from plagioclase; the radiogenic Sr of hot water in Huanghua port is attributed to carbonate dissolution, with lower ⁸⁷Sr/⁸⁶Sr ratio and higher Sr/Na ratio; the recharge area is laterally recharged by the groundwater flowing through igneous and metamorphic rocks, with moderate ⁸⁷Sr/⁸⁶Sr ratio. However, the formation mechanism of Sr isotopes in Tertiary groundwater needs further studies.