基于电子探针的上天梯沸石岩矿物特征和化学成分研究

用电子探针研究了信阳上天梯非金属综合矿床沸石岩中斜发沸石、片沸石、长石、石英、蒙脱石和黑云母等矿物的显微结构特征和化学成分特征.斜发沸石具有高硅铝比、富钾钙、低钠含量等特征,发育良好,呈厚板状形态,具有玻屑假象.片沸石的特点是硅铝比较低.长石分两种,一种是呈碎裂状、边棱尖锐的斜长石,另一种是呈熔蚀状的碱性长石.蒙脱石为火山胶结物蚀变而成,呈絮状,粒径小于0.1μm,常和石英伴生,并有极少量黑云母晶屑.

Study on the Mineralogical Features and Chemical Components of Zeolite Rock in Shangtianti Based on EPMA

The microstructure and chemical components of clinoptlolite,heulandite, feldspar, quartz, montmorillonite and biotite in Xinyang Shangtianti nonmetallic mine are investigated mainly by Electronic Probe X-ray Microregion Analysis （EPMA）. The clinoptlolite has the characteristtcs with high ratio of Si/A1, high content of K and Ca, and low content of Na. The clinoptlolite crystallized well and has a form of thick board with a pseudomorphic of vitric chipping. The heulandite has a low ratio of Si/A1. There are two forms of feldspar, one is cracked plagioclase and the other one is etched alkaline feldspar. The montmorillonite has a form of floc and its granularity is lower than 0.1 μm. The quartz existes with the montmorillonite. There is minute amount of biotite in montmorillonite.