Geochemistry And Metallogenesis Of The Tiyier Gold Deposit,Xinjiang

Tiyier gold deposit is located in the northwest of Daerbute fault which is in the west of Junggar Basin.The major outcropping strata in this district is lower Carboniferous Tailegula formation,which is consist of volcanic rock,athrogenic rock and quartz reef.In this paper,by extractting and generalizating the former geological data of this area,conducting field survey and indoor testing,it focus on the Geochemistry characteristics,the origion of metallogenic material and the metallogenesis of this deposit.The analysis item includes major elements,trace elements,rare earth element features and the H-O,S stable isotope.In addition,Besides,coupling connections among diagenesis epoch,metallogenic epoch and regional tectonic evolution are also studied.Metallogenesis and mineral deposit mode are summarized.Ore body from center to the outside of the alteration has zonality.Ore body center mainly silicification,potash feldspathization and pyritization,to gradually become silicification,carbonatization and pyritization,the external alteration is carbonatization,epidotization and silicification.This gold deposit,whose main gold-bearing mineral is pyrite,arsenopyrite were also found gold.S isotope reflects the characteristics of mantle source,which indicates that ore-forming materials mainly come from the mantle.H-O isotope characteristics shows that the ore-forming fluid is the characteristics of magmatic water,mixed with a small amount of atmospheric precipitation.Within the mining area and the periphery quartz vein statistics found that the main extension is 55 ° and 110 ° direction,just as with mining area of the two fracture F27 and F17 direction.The long axis direction of the ore bodies and F17 in the same direction,it shows that tectonic control of the ore body.Through the analysis of the main rock and ore in west junggar,measured by the age of the data set in around 310 Ma and 290 Ma two interval,correspongding basite and acidite.The early formation of andesitic porphyrite volcanic activity and the late strong acidic magmatic activity corresponds to the area of the two major magamatic activity.All factors considered,Tiyier gold deposit is magmatic hydrothermal genesis deposit associated with volcanism and controlled by tectonic movement.