Geological Features And Genesis-probing Of Sawusi Pb-Zn Deposit,Fuyun County, Xinjiang

According to characteristics of genetic mineralogy, take Sawusi lead-zinc deposits , which discovered in the east of Maizi basin in recent years, as the main object, and based on the previous works, the geological deposits characteristics, geochemical mineral standard type characteristics were studied deeply.By Organizing field investigation intensively, collecting large amount of geological information, gathering a great number of rocks and ore samples, using the Modern Petrology Application, Economic Geology, Geochemistry, Mineralogy and other theories and methods, accompanied by Computer-Aided Processing, Simulation Drawing and other means, proved that the main course which has produced Sawusi lead-zinc deposits is submarinevolcanic exhalation-sedimentary deposits.On these bases, the law of Ore-formation and sign of ore prospecting was summed up. Main achievements are as follows:1.Through observe the polished section and thin section under microscope and analyze 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 ore types. And according to the ore mineral assemblage, combined with the ore texture and structure, we consider that the formation of deposits experienced three stages, they are hydrothermal mineralization period, dynamometamorphism transformation period and hypergenemetallogenic period respectively.2.Through the silicon-alkali, Si2O-K2O, Si2O-FeO / (FeO + MgO), AFM diagram and tectonic setting discrimination diagrams show that the Sawusi lead-zinc deposits of rhyolite, tuff, syn-collision– corcovadite, and the Early Devonian Kangbutiebao formation volcanic rocks of southern margin of Altay were formed active continental margin or island arc environment. The Kangbutiebao formation lower group of small corner of the island arc porphyry eruption of undersea environment, the upper rhyolite eruption in the continental margin.3.The primitive mantle-normalized multi-element spider diagrams show that the three types rock of Sawusi lead-zinc deposits obviously Nb, Ta, Ti and Sr, P, Ba negative anomalies, significantly enriched in Th, U, K, La, Ce, Pr, Zr, Hf. 4.Typomorphic characteristics through studies to determine the lead-zinc deposits of Sri Lanka Sawuerdeng about forming temperature between 200 ~ 374℃, which is in - high-temperature hydrothermal type.5. This study by analyzing some of the conclusions drawn, combined with results of previous studies, the establishment of a deposit and metallogenic model of evolution, short of that Sawusi lead-zinc deposit is formed by the Early Devonian volcanic exhalation - sedimentary deposits.6. Through the study we found that a favorable position with ledge, especially the surface skarn (iron hat) is the most direct sign of prospecting in this area. Besides, development of the marble layer strip should be pay attention. At the same time, the characteristics of surface strong carbonation, limonitization and skarn are also important prospecting.