北京平原区第四系含水层中水-岩作用的锶同位素示踪

翟远征;王金生;左锐;滕彦国

doi:10.3981/j.issn.1000-7857.2011.06.001

科技导报 >

2011 , Vol. 29 >Issue 11-06: 17 - 20

DOI: https://doi.org/10.3981/j.issn.1000-7857.2011.06.001

研究论文

北京平原区第四系含水层中水-岩作用的锶同位素示踪

翟远征;王金生;左锐;滕彦国

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北京师范大学水科学研究院；地下水污染控制与修复教育部工程研究中心，北京 100875

收稿日期: 2010-09-08

修回日期: 2011-01-25

网络出版日期: 2011-02-28

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Strontium Isotopic Tracing of Water-Rock Interaction in Quaternary Aquifer in Beijing Plain

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Received date: 2010-09-08

Revised date: 2011-01-25

Online published: 2011-02-28

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摘要

通过采集北京平原区第四系含水层中地下水，并对水样中的Ca2+、Sr2+和87Sr/86Sr比值等进行分析，结果表明，地下水中的Ca2+和Sr2+主要来源于水-岩相互作用，而与地下水补给源的携带关系不大，两者在地下水中经历了相似的水文地球化学过程，可以用于示踪水-岩相互作用过程；地下水样按Sr2+浓度大小可明显分为两组，其中低浓度组对应于相对较高的87Sr/86Sr比值，高浓度组对应于相对较低的87Sr/86Sr比值；87Sr/86Sr比值较大程度上受控于水-岩相互作用，而与海水和当地大气降水中的值有较大不同；地下水中的Sr2+以碳酸盐岩风化来源为主，显示出明显的年代累积效应。永定河流域地下水中的Sr2+浓度总体高于潮白河流域；87Sr/86Sr比值沿地下水流向总体上呈增大趋势。

关键词： 地下水; 水-岩作用; Sr2+; 87Sr/86Sr; 水文地球化学

本文引用格式

翟远征;王金生;左锐;滕彦国 . 北京平原区第四系含水层中水-岩作用的锶同位素示踪[J]. 科技导报, 2011 , 29(11-06) : 17 -20 . DOI: 10.3981/j.issn.1000-7857.2011.06.001

Abstract

Abstract Sampling and analysis for contents of Ca2+, Sr2+ and ratios of 87Sr/86Sr in groundwater were carried out in Quaternary aquifer in Beijing Plain. It is shown that Ca2+ and Sr2+ in groundwater mainly come from water-rock interaction, and are not closely related with the sources of groundwater; they undergo a similar hydrogeological processes, which can be used to trace the water-rock interaction processes; the samples can be divided into two groups according to the concentration of Sr2+; that with a lower concentration of Sr2+corresponds a higher ratio of 87Sr/86Sr, and that with a higher concentration of Sr2+ corresponds a lower ratio of 87Sr/86Sr; ratios of 87Sr/86Sr are mainly controlled by water-rock interactions, which are generally different from those of sea and local precipitation; Sr2+ in groundwater comes mainly from carbonate rocks, and sees age effects distinctly. The concentration of Sr2+ in groundwater in the Yongding River Basin is greater than that in the Chaobai River, and the ratios of 87Sr/86Sr in groundwater are generally increasing along the flow path.

Key words： groundwater; water-rock interaction; Sr2+; 87Sr/86Sr; hydrogeochemistry

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