A Study On The Characteristics And Genesis Of W-Mo Polymetallic Deposits, Ningguo

The Dawujian W-Mo deposit which located in the territory of Xiaxi Xiang,Ningguo City, Anhui Province,the results showed that the deposit is expected toreach medium scale. This work through field geological investigation andindoor comprehensive study, combined with the main trace rare earth elementsanalysis， S-H-O stable isotope studies, magmatite zircon U-Pb dating andmolybdenite Re-Os dating and other geochemical methods, discussed theDawujian deposit metallogenic’s age, metallogenic geological conditions, theformation of magmatic rocks and ore deposit genesis. The main achievementsand new ideas are as follows:Dawujian deposit ore body mainly occurred in the LanTian group and thesecond member of the NanTuo formation of carbonate formation, thedistribution was like a layered ore bodies, ore types were mainly skarn type,main metallogenic stage was late skarn and quartz sulfide phase. S-H-0isotopic features indicated that ore-forming materials mainly came from magma,a small amount from stratum, ore-forming fluid mainly came from magma, havemixed with meteoric. Zircon U-Pb and molybdenite Re-Os dating results showedthat the diagenetic mineralization time, formed in the late Jurassic, for theYanshanian mineralization.Study of metallogenic geological conditions showed that the formation of thedeposit is strata structure-a result of interaction of magmatite. The magmaticrock belonged to the type I granite mining area, diagenetic material came mainlyfrom the partial melting of the lower earth’s crust, and the mantle sourcematerial contamination, the regional metallogenic dynamics background forregional stretch extrusion under local environment.Combination of features, thinked that the Dawujian W-Mo deposit related toYanshan magmatic activity type stratabound skarn W-Mo deposit.