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Timing and Source of the Hermyingyi W-Sn Deposit in Southern Myanmar, SE Asia: Evidence from Molybdenite Re-Os Age and Sulfur Isotopic Composition

Hai Jianga, Shao-Yong Jianga,*, Wen-Qian Lib,**, Kui-Dong Zhaoa
a State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;b Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

 

ABSTRACT: The Hermyingyi W-Sn deposit, situated in southern Myanmar, SE Asia, is a typical quartz-vein type W-Sn deposit. The ore-bearing quartz veins are mainly hosted by the Hermyingyi monzogranite which intruded into the Carboniferous metasedimentary rocks of Mergui Series. According to mineral assemblages and crosscutting relationships, four ore-forming stages are recognized: (1) silicate-oxide stage; (2) quartz-sulfide stage; (3) barren quartz vein stage; (4) supergene stage. Five molybdenite samples from the deposit yield Re-Os model ages from 67.8 ± 1.6 to 69.2 ± 1.6 Ma (weighted mean age of 68.7 ± 1.2 Ma), and a well-defined isochron age of 68.4 ± 2.5 Ma (MSWD = 0.18, 2σ). The newly obtained Re-Os age is consistent with the previously published zircon U-Pb age of the Hermyingyi monzogranite (70.0 ± 0.4 Ma) (MSWD = 0.9, 2σ) within errors, which indicates a genetic link between the monzogranitic magmatism and W-Sn mineralization. The new high-precision geochronological data reveal that the granitic magmatism and associated W-Sn mineralization in southern Myanmar took place during the Late Cretaceous (70-68 Ma). The extremely low Re contents (22.9 to 299 ppb) in molybdenite, coupled with sulfide δ34S values in the range of +1.9‰ to +5.6‰ suggest that ore-forming metals were predominately sourced from the crustal-derived granitic magma.

KEY WORDS: Hermyingyi W-Sn deposit; Molybdenite Re-Os dating; Sulfur isotopes; Myanmar; SE Asia

 

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Keywords:Hermyingyi W-Sn deposit; Molybdenite Re-Os dating; Sulfur isotopes; Myanmar; SE Asia

DOI:
10.1007/s12583-018-0991-1
CLC number:
U469.72
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