Geochemical Characteristics of Jinwozi Gold Deposit,Xinjiang

The Jinwozi gold deposit consists of gold-bearing quartz veins in a biotite granodiorite of Hercynian age (Zircon U-Pb age≈335.7Ma).Ore mineralogy is simple .In addition to native gold,there are only small amounts of sulfides,meinly pyrite and minor sphalerite,chalcopyrite and galena.δ^34S val-ues average 6.69‰,and δ^18O13.99‰.Abundant CO2 is contained in fluid inclusions from quartz.Homogenization temperatures of fluid inclusions are between 186 and 262°.REE distribution pat-terns indicate that the igneous mass may have been derived from a common initial material of calcareous-argillaceous sediments and alkali basalts as the country rocks.In other words,the Jinwozi granodiorite is of remelting origin from crustal material.Isotopic evidence of S,O and Pb shows that the ore-forming material is genetically related to magmatic hydrothermal activity.