Study on the alteration of feldspar from clastic rock in Tarim Basin
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摘要: 本文采用扫描电镜和能谱分析等手段研究了塔里本盆地碎屑岩中长石颗粒在酸性介质中的蚀变过程及其产物。研究发现长石颗粒在酸性介质中存在两种蚀变途径。岩石渗透性好时，孔隙水流动性好，长石蚀变析出的碱性离子很容易被带走，长石蚀变的最终产物为高岭石及自生石英。相反，岩石渗透性差时，孔隙水流动性差，长石蚀变析出的碱性离子只有少量被带出，而大多数在弱酸性环境中，与长石蚀变的中间产物硅铝凝胶反应，生成蒙脱石或伊利石。本文着重研究了钾长石在弱酸性环境中，与长石地变的中间产物硅铝凝胶反应，生成蒙脱石或伊利石。本文着重研究了钾长石在弱酸性介质中蚀变生成伊利石的过程。Abstract: Reseach on the alteration process and precipated products of feldspar from elastic rock in Tarim Basin was carried out by the way of scanning electron microscope and energy spectrum analyzed. The results show that there are two alteration ways of feldspar in the acid medium.The products are Kaolinite and authentic quartz when the porosity and Permeability of elastic rock is high, and in this case, the alkaline ions (K+, Na+ ) precipated from feldspar are carried away easily. Contrarily, the products are illite and smetite when the porosity and Permeability is lower. Especially, study on the alteration proceder of K-feldspar and it's products was carried out in this paper.
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Key words:
- acid medium /
- alteration /
- feldspar /
- illinite /
- kaolinite /
- amorphous body
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