Study On Mineralogy And Fluid Inclusions Of Phenols From Gejiu Tin Ore

Based on the national natural science fund project" Old super large tin-deposit cassiterite mineralogy and mineral chemistry and mineral U-Pb chronolOgy research",the paper is doing a systematic study for the cause of formation of the old tin stone cassiterite mineralogy and fluid inclusion characteristics,in order to further reveal the formation of the old tin-deposit environment and cause to provide scientific basis.This paper studies and analyzes cassiterite that the old tin ore field of old factories mines fields and pine foot massive sulfide type tin deposits,tourmaline fine vein type tungsten tin bismuth ore,containing tin dolomite,interlayer oxidized ore deposit, using scanning electron microscope,cathodoluminescence imaging,X-ray powder diffraction and electronic probe,the inclusion thermometry,and laser Raman technique,cassiterite single minerals do the research for the size of cassiterite particles,the development situation of crystal cone and pillar of cassiterite,the internal structure of crystal cassiterite,tin crystal cell parameters,the content of elements in the same class quality like tin stone,tin stone average temperature and ore-forming environment research,the research shows that:(1)Massive sulfide type,tourmaline fine vein type,tin dolostone type,oxidation interlayer type ore deposit of cassiterite particles volume become smaller progressively；(2)There are seven types in the four types of ore deposits in crystal cassiterite: Type A: {111]+{110}+{321}+{100};Type B:{111}+{110};Type C:{321}+{111}+{221};Type D:{111}+{110}+{102}+{321};Type E:{111}+{110}+{100};Type F:{111}+{101}+{110}+{100}； Type G:{111}+{123}+{110},from a massive sulfide type to interlayer oxidation type deposit in cassiterite by the cone is to develop in the cylinder gradually;(3)The massive sulfide deposits in the dark tin crystal cell volume is greater than the light color crystal cell volume;(4)The massive sulfide type,tourmaline fine vein type,tin dolomite ore deposit type in the CL intensity difference of cassiterite can be divided into two phases in the early and late cassiterite;(5) The massive sulfide type, tourmaline fine vein type, cassiterite in dolomite type ore deposit, the band is growing up under the CL layer, rather than due to differences in chemical composition to form the growth of the band;(6) Massive sulfide type, tourmaline vein type, tin dolomite, interlayer oxidized ore deposit types of cassiterite ore-forming fluid temperature reduce gradually, cassiterite particles decrease gradually at the same time;(7) With increasing of the pressure of mineralization, the crystal a, c, v has become smaller.(8) Combined with cassiterite inclusion temperature, salinity, density, metallogenic pressure depth research, think that the massive sulfide type, tourmaline vein type, tin dolomite ore deposit belongs to the granite magma hydrothermal superimposed transformation, the pine foot interlayer oxidation type ore deposit belongs to the heavy argillaceous sedimentary formation.