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使用批反应器实验研究 2 1℃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～ 2 mm,0 .5～ 1mm和 0 .2～ 0 .5 mm的花岗岩样品各 15 0 g和 75 0 ml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 6 0 d。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。
The experimental study of the effect of granite and distilled water at 21 ℃ on the batch reactor was used to investigate the water-rock interaction and the geochemical evolution of liquid phase with time. Granite samples with particle sizes of 1 to 2 mm, 0.5 to 1 mm and 0.2 to 0.5 mm, respectively, were subjected to a reaction test with 15 0 g and 75 0 ml pure water added to 3 batch reactors made of polypropylene . During the test, the electric motor was used to continuously rotate the reactor. The test time is 60 days. The results show that the liquid phase is mainly Ca- (K) - HCO3 water or K- (Ca) - HCO3 water. K + mainly comes from the dissolution of K-feldspar, Ca2 + is mainly related to the dissolution of the plagioclase component of plagioclase. K + is easily released from primary minerals containing K +, and K + is also easily precipitated from water to form secondary minerals. The “excess Ca” in the water is well explained by the inconsistent dissolution of plagioclase, and the difference in solubility between the anorthite and the albite is also one of the possible causes of “excess Ca” in the water. The experimental results are consistent with the explanation of the rate control mode of surface reaction and the exchange of surface competition between Na + and H +.