河北平原地下水锶同位素形成机理

叶萍; 金勤胜; 周爱国; 刘存富; 蔡鹤生; 甘义群

河北平原地下水锶同位素形成机理

1.
中国地质大学环境学院, 湖北武汉 430074
2.
中国地质大学江城学院工程学院, 湖北武汉 430200
3.
中南电力设计院, 湖北武汉 430071

基金项目:

中国地质调查局地质调查专题研究项目 2003201500002

详细信息

作者简介:
叶萍(1975-), 女, 博士研究生, 从事环境同位素方向研究.E-mail: todjin@sina.com

中图分类号: P641
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出版历程
- 收稿日期: 2007-04-16
- 刊出日期: 2008-02-25

Formation Mechanism of Sr Isotopes in Groundwater of Hebei Plain

1.
Faculty of Environmental Studies, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Engineering, Jiangcheng College of China University of Geosciences, Wuhan 430200, China
3.
Central Southern China Electric Power Design Institute, Wuhan 430071, China

摘要

摘要: 为了研究河北平原地下水锶同位素的来源与形成机理, 对所采水样进行了分析.研究了⁸⁷Sr/⁸⁶Sr比值“时间积累效应”: 随着地下水年龄和埋深的增大而增大; 与地下水中过剩⁴He_exc呈正相关关系, 与δ¹⁸O和δD呈负相关关系.探讨了Sr²⁺与⁸⁷Sr/⁸⁶Sr比值的关系, 将地下水分为3类: (1) 中等Sr²⁺含量与高⁸⁷Sr/⁸⁶Sr比值水(Ⅰ类水); (2) 低Sr²⁺含量与高⁸⁷Sr/⁸⁶Sr比值水(Ⅱ类水); (3) 高Sr²⁺含量与低⁸⁷Sr/⁸⁶Sr比值水(Ⅲ类水), 即热水.通过综合分析认为: (1) 河北平原第四系地下水中的放射成因Sr是由富含Na和Rb的硅酸盐矿物风化作用提供的, 主要矿物为斜长石; (2) 黄骅港热水中的放射成因Sr是由碳酸盐溶解形成的, ⁸⁷Sr/⁸⁶Sr比值低, Sr/Na比值大; (3) 补给区地下水是由流经火成岩和变质岩区地下水的侧向补给的, ⁸⁷Sr/⁸⁶Sr比值中等.第三系地下水放射成因Sr的来源及形成机理尚须进一步研究.
- 锶 /
- ⁸⁷Sr/⁸⁶Sr /
- 地下水 /
- 河北平原
Abstract: To analyze the genesis of Sr isotopes ingroundwater of Hebei plain, time-accumulative effect of ⁸⁷Sr/⁸⁶Sr ratios 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_exc 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: (1) moderate Sr²⁺ content and higher ⁸⁷Sr/⁸⁶Sr (water I); (2) lower Sr²⁺content and higher ⁸⁷Sr/⁸⁶Sr (water Ⅱ); and (3) higher Sr²⁺ content and lower ⁸⁷Sr/⁸⁶Sr (water Ⅲ), that is hot water. On the basis of integrated analysis, it was considered that (1) the radiogenic Sr in the Quaternary groundwater (Q4-Q1) originates from weathering of silicate rich in Na and Rb, mainly from plagioclase; (2) the radiogenic Sr of hot water in Huanghua port is attributed to carbonate dissolution, with lower ⁸⁷Sr/⁸⁶Sr and higher Sr/Na; (3) the recharge area is laterally recharged by the groundwater flowing through igneous and metamorphic rocks, with moderate ⁸⁷Sr/⁸⁶Sr ratio. However, the genesis of Sr isotopes in Tertiary groundwater needs further studies.
- strontium /
- ⁸⁷Sr/⁸⁶Sr /
- groundwater /
- Hebei plain.

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图 1 河北平原第四纪地层轻矿物含量变化对比图(据陈望和和倪明云, 1987)

Fig. 1. Comparison by content between quartz and feldspar in Quaternary stratum of Hebei plain

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图 2 河北平原地下水溶解锶浓度和其他主要离子浓度关系

Fig. 2. Relations between dissolved strontium (Sr²⁺) and other main ions in the groundwater of Hebei plain

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图 3 河北平原地下水δ⁸⁷ Sr等值线图

Fig. 3. δ⁸⁷ Sr value contour ingroundwater in Hebei plain

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图 4 ⁸⁷Sr/⁸⁶Sr与[Sr²⁺]关系图

Fig. 4. Relation between⁸⁷Sr/⁸⁶Sr and [Sr²⁺]

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图 5 δ⁸⁷Sr与[Cl^-] (a)和δ⁸⁷Sr与[Sr²⁺]/[Na⁺] (b) 关系

Fig. 5. Relations between δ⁸⁷Sr and [Cl^-] (a) andδ⁸⁷Sr and [Sr²⁺]/[Na⁺] (b)

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表 1 沧州地区地层中元素平均含量与克拉克值的对比(据杨子赓, 1979)

Table 1. Comparison between mean element content and carat gram value from Quaternary stratum of Cangzhou

表 2 研究区深层地下水化学分析结果及取样深度(单位: mg/L)

Table 2. Groundwater chemical data and depth of study area

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