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四川北部晶须状透闪石成因研究
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摘要
在四川北部南江地区鹰嘴岩—官坝构造区内麻窝子组地层中发现存在一套晶须状透闪石矿。透闪石是角闪石族中钙质角闪石系列中富镁贫铁的端元矿物,广泛用于陶瓷、玻璃、涂料、造纸、橡胶、冶金工业,是一种重要的非金属矿物。晶须是20世纪下半叶发明的一种新型增强材料,它是一种纤维状单晶体,长径比一般大于10。利用产于该地区的晶须状透闪石制备了硅酸钙镁晶须和导电晶须,在增强复合材料和电磁波屏蔽材料领域有较大应用和经济价值。晶须状透闪石的成因研究有着重要的理论意义和应用价值。
     本文通过野外地质调查,采集样品,利用X射线衍射、扫描电镜、红外光谱分析、岩石化学分析、镜下鉴定等技术手段,分析了南江西清和大河两个地区透闪石的矿物学、岩石学特征,结合区域地质资料、矿区地质资料讨论四川北部晶须状透闪石成因,并由室内模拟实验验证。川北晶须状透闪石产于元古代麻窝子组与中-酸性岩浆岩侵入体接触带,钙镁质碳酸盐岩沉积物经历了区域变质,接触交代变质和地表风化淋滤三个主要阶段,晶须状透闪石块状含方解石透闪石岩在酸性地表水的淋滤作用下,使碳酸盐溶解流失,最终形成松散晶须状透闪石。
There is a set of friable whisker-shaped or block-shaped tremolite in Mawozi Group in Yinzuiyan– Guanba tectonic terrain in Nanjiang, north Sichuan. Tremolite which is Mg-rich and Fe-poor is the end member of calcic amphiboles. It is kind of important nonmetallic minerals, which can be used in ceramics, glass industry, coatings, paper making, rubber and metallurgical industry. Whisker is a new kind of reinforced materials invented in 20th, it is a fibrous monocrystal, and its length-diameter ratio is more than 10 generally. CaMg silicate whisker and conductive whisker which can be used in whisker reinforced composites and Electromagnetic Shielding Composite have been prepared in using the whisker-shaped tremolite from Dahe and Xiqing ,Northern Sichuan.
     Tremolites from Dahe and Xiqing were characterized by optical and electron microscopy, powder X-ray diffraction, infrared spectroscopy and chemical analysis, and its genesis which has been proved by indoor simulation experiment had been revealed by researching mineralogy and petrology characteristics, geology of the region and mining area. The genesis of the whisker-shaped tremolite has been concluded that some basic to neutral magmas intruded into dolomitic marble, then the tremolites had been produced by the related contact metasomatic metamorphism, and been eluviated by acid water later to become friable whisker-shaped tremolite.
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