| 引用本文： |
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朱义年,刘辉利,Ingrid Stober,Kurt Bucher.室温下水-花岗岩作用时液相组分的演化[J].广西科学,2003,10(3):216-219. [点击复制]
- Zhu Yinian,Liu Huili,Ingrid Stober,Kurt Bucher.Geochemical Evolution of the Aqueous Phase Under Water-Granite Interaction at Room Temperature[J].Guangxi Sciences,2003,10(3):216-219. [点击复制]
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| 摘要: |
| 使用批反应器实验研究21℃时花岗岩与蒸馏水的作用来探讨水-岩作用以及液相随作用时间的地球化学演化。粒度为1~2mm,0.5~1mm和0.2~0.5mm的花岗岩样品各150g和750ml纯水加入用聚丙烯做成的3个批反应器中进行反应试验。试验过程中用电动马达连续转动反应器。试验时间为60d。结果表明,液相主要是Ca-(K)-HCO3型水或K-(Ca)-HCO3型水。K+主要来自钾长石的溶解,Ca2+主要与斜长石中钙长石组分的溶解有关。K+很容易从含K+的原生矿物中被释放出来,同时K+也容易从水中析出形成次生矿物。水中"Ca过剩"可以很好地用斜长石的不一致性溶解反应来解释,钙长石和钠长石悬殊的溶解度差异也是水中"Ca过剩"可能的原因之一。实验结果与用表面反应控制速率模式的解释及Na+和H+的表面竞争交换相一致。 |
| 关键词: 花岗岩 水-岩作用 水的演化 水的类型 |
| DOI： |
| 投稿时间：2003-05-12修订日期：2003-06-09 |
| 基金项目: |
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| Geochemical Evolution of the Aqueous Phase Under Water-Granite Interaction at Room Temperature |
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Zhu Yinian, Liu Huili, Ingrid Stober, Kurt Bucher
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| (Dept. of Resources and Environmental Engineering, Guilin Institute of Technology, 12 Jianganlu, Guilin, Guangxi, 541004, China) |
| Abstract: |
| The granite-distilled water interaction at 21℃ is investigated with batch-reactors to study water-rock reactions and geochemical evolution of the aqueous phase with the reaction time.The granite samples of grain size 1~2 mm,0.5~1 mm and 0.25~0.5 mm of 150 g and 750 ml water are added into three batch-reactors respectively,and rotated by electromotor with reaction time of 60 days.The results showed thatthe aqueous phases are mainly the Ca-(K)-HCO3-type water or the K-(Ca)-HCO3-type water.K+ and Ca2+ stem are mainly from the dissolution of K-feldspar and anorthite in plagioclase,respectively.K+ can be easily released from the primary K-bearing minerals,it could also easily form secondary minerals and be removed from water.The "problem of excess calcium" in water can best be understood if plagioclase dissolves incongruently.The dramatic solubility difference of anorthite and albite is also one of the most possible reason for the high-Ca water.The experimental result is consistent with the interpretation using the surface-reaction-control rate model and the competition between Na+ and H+ for surface exchange sites. |
| Key words: granite water-rock interaction water evolution water type |
