The Characteristics Of The Intermediate-basic Volcanic And Its Native Copper Mineralization In Blatter Region,Xiemisitai,Xinjiang

The Xiemisitai region is located in the northern margin of the West Junggar,Xinjiang.Based on the previous,Combining with the field geologic investigation,this paper determine its geology,geochemical characteristics and mineralized characteristics by petrography,mineralography,geochemistry and electron probe microanalysis method,To find out the intermediate-basic volcanic forming time,petrogenesis,tectonic setting,which provides new evidence for the evolution of the Xiemisitai region in Early Paleozoic.To find out the native copper mineralization characteristic and the metallic minerals of component analysis,a preliminary discussion on native copper formation processes,prospecting potential and prospecting criteria.Some advances have been obtained below:1.Through field geologic investigation and the project acquires the acid volcanic rocks and subvolcanic rocks of ages,a preliminary inference that they crystallized in Late Silurian or Late Silurian before.2.The basic volcanic rocks are MgO(4.32%?7.23%),Mg#(49.59?58.38),FeOT/MgO(1.57?2.24);The intermediate volcanic rocks are MgO(3.84%?6.08%),Mg#(56.57?62.45),slightly greater than the former,FeOT/MgO(1.32?1.51),slightly lower than the former.they are characterized by high Na2O+K2O and Al2O3 contents and belong to calc-alkaline series,relative enrichment of Fe and depletion of Mg,enrichment of Ba,Sr and Pb,depletion of Nb,Ta and Ti elements.3.The intermediate-basic volcanic is formed by the subduction of a continental marginal arc,which experienced fractional crystallization of clinopyroxene,contaminated by continent crust,subduction metasomatic fluids.4.The intermediate-basic volcanic had a strong alteration and subvolcanic hydrothermal vein.The native copper mineralization occurs mainly in the altered intermediate-basic volcanic and the late hydrothermal veins in the intermediate-basic volcanic.Mineralization concerned with the subvolcanic hydrotherm,which can be broadly divided into three phases.5.The native copper mineralization of the intermediate-basic volcanic is a relatively smaller scale,It is exploited using as a small ore deposits which are high grade,shallowly buried and easy to refine with good economical and social benefits.The native copper of prospecting mark:alteration and vein mark,colour is green grey,air hole and almond are small,colour is green grey,quartz epidote briquette.