Causes of Mineralogy Researching in Songshugou Copper Deposit in Xinjiang’s Tianshan Mountain West

Causes of Mineralogy Researching in Songshugou Copper Deposit in Xinjiang’s Tianshan Mountain West
　　The Songshugou copper deposit is situated in the tectonic belt of Yuximologaidaban , Balatao NW, SE in area, which belongs to the east postpone part of Iron and copper mineralization belt. Owing to the mining area NNE direction fracture is to control the structure that mineral deposit forms mainly, Together with permian granitic porphyry controls the output of Songshugou copper deposit.Based on study on geological background of the copper deposit, geological Neodymium Magnets characteristics of orebody, surrounding rock alteration, ore type, and mineral paragenesis combination, this paper has partitioned the mineralization periods, phases and forming order of mineral, and also done a contrast research on trace element and REE of typomorphic pyrite, chemical composition of chlorite and crystal-chemical characteristics, fluid inclusions feature in quartz through using modern testing methods.According to mineralization periods and intergrowth combination relations, pyrite can be divided into three generations.
　　The analysis results of Pyrite’s main trace elements show that the Pyrites in this ore district is attributed to hydrothermal genesis type. The Maldistribution of REE in Pyrite manifests the loss of Eu and Ce. The testing result of sulphur isotope is close to the recognized upper mantle range, and indicates that the sulphur of mineral perhaps is derived from magma.The chlorite, with a wide distribution range, is the main alteration mineral of this copper deposit. According to its producing characteristic and colacobisis combination relation, chlorite can be divided into two types, one is metasomatic type, the other is filling vein type. The chlorite of the metasomatic feldspathic type is relevant to mineralization, with lower content of icon and atomicity of Fe ranging from 1.476 to 1.639 in http://www.999magnet.com/ crystal chemical formula. While the chlorite of veil type bear higher icon content and atomicity of Fe ranging from 1.879 to 2.143. The obvious difference of icon contents in this ore district can be regarded as the typomorphic peculiarity for searching for copper mineralization. The forming temperature of chlorite is calculated to be from 288℃to 324℃.Research on fluid inclusions in quartz of this ore district indicates the two main types, which is gas-liquid inclusions and multiphase inclusions with daughter mineral,the former inclusions shapes look like circle granular, granular and irregular, while the latter look like round and irregular. Homogeneous temperature of the inclusions varies ranging from 106～345℃, salinity (NaCl) varies from 5.41 to 42.04 wt %, fluid density value is from 0.75 to 1.15g/m-3, the range of ore-forming pressure is estimated to be from 30 to 91Mpa, ore-forming depth is 996-3049M.