硅酸盐学报

碱-碳酸盐岩反应机理

作者：刘峥韩苏芬唐明述

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出版年,卷(期):页码：1987,15(4):302-308

DOI：

摘要：

本文应用光学显微镜、扫描电子显微镜、透射扫描电子显微镜和能谱仪(SEM/EDAX和召TEM/EDAX)比较详细地研究了活性碳酸盐岩石的微观结构。实验表明,在活性碳酸盐岩石中,菱形白云石晶体孤立地分布在由微晶方解石和粘土所构成的墓质中,粘土呈网络状分布在微晶方解石之间。活性岩石经碱液作用后,在白云石晶体外面生成平行排列的水镁石晶体。根据微观结构的研究结果可以提出碱-碳酸盐岩反应的膨胀机理:OH~-,M~+和水分子通过粘土网络间的通道进入岩石内部与白云石晶体反应,这些离子和水进入限制空间以及白云石晶体表面,由于反白云化而产生的晶体生长和重排是引起膨胀的根本原因。

In this article, the microstructure of a reactive carbonate rock is studied in detail by use of optic microscope and SEM/EDAX. Experimental results show that the rhembic dolomite orystallites distribute isolatety in the matrix composed of fine calcite crystals and clay.The clay forms a network among the fine calcite grains.After the reaction of the reactive carbonate rock with alkali solution, brueite crystals parallelly arranged on the surface of dolomite crystals are seen. An expansion mechanism based no the observation of microstructure is proposed: M~+,OH~- ions and water molecules pass throagh the network channels of clay and then react with the minute dolomite crystals. As the entrance of active ions and water molecules into a restricted space and the incessant growth and rearrangement of crystals on the surfaces of dolomite crystals induced by dedolomitization, expansion is occurs.

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中国科学院科学基金资助

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参考文献：

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