Geological Features And Genesis-probing Of Porphyry Copper Deposit In East Tianshan

According to Tuwu and Yandong as the main objects in east Tianshan Mountainin recent years, and based on the previous works, the geological depositscharacteristics, geochemical mineral standard type characteristics were studied deeply.By Organizing field investigation intensively, collecting large amount ofgeological information, gathering a great number of rocks and ore samples, using theModern Petrology Application, Economic Geology, Mineralogy and other theoriesand methods, accompanied by Computer-Aided Processing, Simulation Drawing andother means to discuss the porphyry belt feature of Tuwu and Yandong.Through observe the polished section and thin section under microscope andanalyze carefully, we get the basic identification of the ore minerals, gangue minerals,paragenesis, ore textures, structures and so on, finished the initial division of the oretypes. And according to the ore mineral assemblage, combined with the ore textureand structure, we consider that the formation of deposits experienced three stages,they are Volcano eruption period, Multiple intrusion of magma period andHydrothermal superimposition mineralization period respectively.Throughypomorphic characteristics、temperatures and salinity of fluid inclusion studies todetermine the porphyry belt feature of Tuwu-Yandong with the previous test resultscomparison,which is in Low-medium temperature and Low-medium salinitymineralization system.Through the study found that developed in the continentalmargin arc and island arc environment potential region.Wall rock alterationcharacteristics chalcopyrite,and malachite are important prospecting marks.This studyby analyzing some of the conclusions drawn, combined with results of previousstudies, To establish porphyry metallogenic evolution and model of the porphyry belt.