Genesis Of Ore Forming Rocks In Xilekudouke Mo Deposit And Implication For Regional Mineralization

Xilekudouke,ongly one porphyry Mo deposit in East Junggar,located in the north of East juggar district.Monzornite,porphyritic granite and quartiz porphyry are main intrusions in Xilekudouke minig area.The intrusions,I type granitoids,are quasi-aluminous to weakly prealuminous rock types with calc-alkline and high-K calc alkaline series.Deposit is closely relatet to Monzornite and porphyritic granite.Zircon U-Pb ages of the intrusions is 315.7±2.3 Ma,326.4±2.0 Ma,328.2±1.8Ma for quartiz porphyry,porphyritic granite and Monzornite,respectively.Intrusions in Xilekudouke generated during early Carboniferous time in post-collisional setting.Intrusions have similar ?Hf(t)and Two stage model age.?Hf(t)for Monzornite,porphyritic granite and quartiz porphyry is 11.5-15.5,12.7-15.1,12.3-15.6 respectivly.Intrusions have uniform zircon ?18O and similar to mantel zircon?18O.Zircon ?18O of monzornite is 4.89-5.26,mean 5.03;Zircon ?18O of porphyritic granite is 4.84-5.18,mean5.07;Zircon ?18O of quartiz porphyry is 4.29-5.08,mean 4.85;Meanwhile,Ore forming intrusions have similar chondrite-normalized rare-earth element pattern and related Harker diagrams,indicates that the Xilekudoukeore forming intrusions mainly derived from partional melting of new oceanic crust without sediments and old continental crust.Differentation of parental magma generated Monzornite,porphyritic granite.Ti in zircon temperature indicates the crystallization temperature of the intrusions.Ti in zircon temperature is 568-825oC,mean728oC for monzornite;615-745 oC,mean719 oC for porphyriticgranite;686-878 oC,mean777 oC for quartiz porphyry.Ore related monzornate and porphyritic granite has hight oxygen fugacity and CeIV/CeIII related to barren quartiz.oxygen fugacity and CeIV/CeIII for porphyry monzornite is-7.5 to-21.04,mena-12.20 and 25.61-141.45,mean71 respectivly;For porphyritic granite is-8.62 to-18.84,mean-12.80 and 38-147.5,mean 95,respspectivly;For porphyritic granite is-8.62 to-18.84,mean-12.80 and 38-147.5,mean95,respspectively;For quartiz porphyry is-13.92 to-19.02,mean-16.73 and 6.21-42.77,mena 23.97,respectively.Both of Oxygen fugacity and CeIV/CeIII indicates that Xilekudouke porphyry deposit ouccurs in relatively high oxygen origion.Contrasting Xilekudouke ore bearing intrusions to giant porphyry in Central Asian Orogenic belt,reveal that size of Xilekudouke porphyry deposit may restricted its by size of oxygen fugacity in its origion.