Liu, Peng, Mao, Jingwen, Cheng, Yanbo, Yao, Wei, Wang, Xiaoyu, and Hao, Di (2016) An Early Cretaceous W-Sn deposit and its implications in southeast coastal metallogenic belt: constraints from U-Pb, Re-Os, Ar-Ar geochronology at the Feie'shan W-Sn deposit, SE China. Ore Geology Reviews, 81 (Part 1). pp. 112-122.

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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 ± 1.7 Ma, which was interpreted as the emplacement age of the biotite monzonitic granite porphyry. The Re-Os model ages ranged from 137.3 ± 2.0 Ma to 146.1 ± 2.1 Ma, with a weighted mean age of 140.6 ± 1.9 Ma, and Ar-Ar isotopic analyses of hydrothermal biotite yield a plateau ⁴⁰Ar/³⁹Ar age of 135.1 ± 0.8 Ma. 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 144–132 Ma for W-Sn mineralization in the Southeastern Coastal Metallogenic Belt. The Feie'shan W-Sn deposit belongs to the 144–132 Ma metallogenic events in the SCMB, in a geodynamic setting of lithospheric extension.

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