Research On Genesis Of The Whisker-shaped Tremolite In North Sichuan

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.