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Journal of Earth Science

, Volume 30, Issue 1, pp 70–79 | Cite as

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 Jiang
  • Shao-Yong JiangEmail author
  • Wenqian LiEmail author
  • Kuidong Zhao
Article
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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 ranging 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). This 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 ppb 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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Notes

Acknowledgments

This study is financially supported by the National Key R&D Program of China (No. 2017YFC0602405), the National Natural Science Foundation of China (Nos. 41503043, 91755208), and the MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (No. MSFGPMR03-2). We are very grateful to Tenwin-Pacific Brothers Mining Services Company Limited for field assistance. Special thanks are extended to two anonymous reviewers for their constructive comments and suggestions. The final publication is available at Springer via  https://doi.org/10.1007/s12583-018-0860-y.

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© China University of Geosciences and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanChina
  2. 2.Faculty of Earth Resources, Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesChina University of GeosciencesWuhanChina
  3. 3.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina

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