Abstract
The Feie'shan W-Sn deposit is in eastern Guangdong Province, which is a newly explored deposit in the southeastern coastal metallogenic belt. In order to constrain the age of mineralization in the Feie'shan W-Sn deposit, we collected molybdenites and hydrothermal biotite of the Feie'shan W-Sn deposit for dating. The tungsten mineralization is spatially associated with the biotite monzonitic granite porphyry. LA-MC-ICP-MS zircon U-Pb dating of the biotite monzonitic granite porphyry yielded a weighted mean 206Pb/238U age of 139.2±1.7Ma, which was interpreted as the emplacement age of the biotite monzonitic granite porphyry. The Re-Os model ages ranged from 137.3±2.0Ma to 146.1±2.1Ma, with a weighted mean age of 140.6±1.9Ma, and Ar-Ar isotopic analyses of hydrothermal biotite yield a plateau 40Ar/39Ar age of 135.1±0.8Ma. These dates, obtained via three independent geochronological techniques, constrained the ore-forming age of the Feie'shan deposit and linked the genesis of the ore to the underlying biotite monzonitic granite porphyry. Combined with previous studies, it is suggested that there is a period at 144–132Ma for W-Sn mineralization in the Southeastern Coastal Metallogenic Belt. The Feie'shan W-Sn deposit belongs to the 144–132Ma metallogenic events in the SCMB, in a geodynamic setting of lithospheric extension.
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