| The tungsten and tin polymetallic deposit of Xinanzi in the Xihuashan-Piaotang ore fields in cong-yu-you ore concentration area in southern Jiangxi.Southern Jiangxi known as ?the world's tungsten?.In recent years,As ?south north tungsten expansion? the exploration of new progress,further consolidate the status of tungsten resources in the world,but high quality black tungsten consumption,resource crisis facing year by year.Xihuashan-Piaotang ore field is the most important one of quartz vein type wolframite resources base,the two large ore deposit of Xihuashan and Piaotang has also become a ?crisis? in mines,Xinanzi tungsten deposit is medium scale at present,is the most potential resources in the area of backup resources base.In this paper Xinanzi tungsten tin polymetallic deposit as the research object,has carried out detailed field geological work,including surface reconnaissance,catalog tunnel,underground observation,drilling,logging,sample collection and sorting,indoor for all kinds of rock ore was carried out by the microscopic identification,diagenetic mineralization isotope chronology test,rock main trace geochemical test and structure analysis,etc.,it is concluded that the following understanding:The contact of a mining area of quartz vein type tungsten tin ore,a total of industrial orebody in article 24,ore body is given priority to with thin veins,veins mainly on to the north west,mainly occurs in the Cambrian system in the shallow metamorphic sand plate.In the surface of Xinanzi tungsten deposit develop lot of Mineralization belt,To deep vein can be transformed into industry,So Xinanzi deposit belongs to the typical of concealed ore deposits.According to the test result that the ore-forming granite of Xinanzi tungsten tin polymetallic deposit diagenetic age was 162.4 ± 2.9 Ma.Molybdenite Re-Os isotope dating experiment results show that the mining area of ore-forming age was 160.2 ±2.0 Ma.The diagenetic age and ore-forming age of Xinanzi tungsten tin polymetallic deposit almost the same.The age are same with other quartz vein type tungsten deposit near by Xinanzi tungsten tin polymetallic deposit.Geochemical data analysis,the ore-forming granite of Xinanzi deposit belongs to high calcium alkaline-calcium alkali series peraluminous granite,with a high differentiation characteristics of S type granite.Xinanzi deposit area of tectonic background belongs to south China lithosphere stretching environment after indosinian orogenic movement,thus caused the massive continental crust remelting type granite magma activity,The concealed granite of Xinanzi deposit has experienced the evolution of the multiphase multi-stage,and associated with tungsten tin ore mining area.The east-west fracture is the major structure for ore in Xinanzi deposit,among them the F1 fracture extension largest,is generally believed that is the main structure for ore.Two of the main structure formation ore deposits accordance with the direction are 350-10°?40-80°;10-35°?60-88°.Concealed within the mining area of yanshan period granite rock outburst position for the good of mineralization,especially in the mineralizing fracture position. |
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