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Re-Os Dating of Molybdenite from Stratiform Skarn Orebodies in the Datuanshan Copper Deposit, Tongling, Anhui Province, and Its Geological Significance
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2005
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EngineeringDatuanshan Copper DepositRe-os DatingTectonic EvolutionEarth ScienceProvenance (Geology)Stratiform Skarn OrebodiesGeochronologyTongling AreaGeologyMineral DepositCratonOre FormationTectonicsAnhui ProvinceEconomic GeologyGeochemistryOre GenesisPetrologyArchaeological Dating
The Datuanshan copper deposit in Tongling, Anhui Province, is located in the middle section of the Middle and Lower Yangtze Valley iron-copper metallogenic belt. The metallogenic epoch of the deposit was previously regarded as Yanshanian on the basis of the ages of intermediate-acid intrusive rocks related to the ore-forming process. The authors collected 6 molybdenite samples from stratiform skarn orebodies in the Datuanshan copper deposit for Re-Os precise dating. The isochron age is 139.1±2.7 Ma, and the Re-Os model ages vary from 138.0～140.8 Ma. These age data are concordant with ~(40)Ar/~(39)Ar ages, 135.8～139.8 Ma, of the ore-forming intermediate-acid intrusive rocks. The Datuanshan copper deposit and the copper-sulfur-gold deposits in Tongling area are products of Mesozoic large-scale metallogenic process in East China, coupling with the geodynamic event of the lithospheric tectonic regime transition.