Timing and Source of the Hermyingyi W-Sn Deposit in Southern Myanmar, SE Asia: Evidence from Molybdenite Re-Os Age and Sulfur Isotopic Composition
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摘要
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 δ~(34)S values in the range of +1.9‰ to +5.6‰ suggest that ore-forming metals were predominately sourced from the crustal-derived granitic magma.
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 δ~(34)S values in the range of +1.9‰ to +5.6‰ suggest that ore-forming metals were predominately sourced from the crustal-derived granitic magma.
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 δ~(34)S values in the range of +1.9‰ to +5.6‰ suggest that ore-forming metals were predominately sourced from the crustal-derived granitic magma.
引文
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Chen,X.C.,Hu,R.Z.,Bi,X.W.,et al.,2014.Cassiterite LA-MC-ICP-MSU/Pb and Muscovite 40Ar/39Ar Dating of Tin Deposits in the Tengchong-Lianghe Tin District,NW Yunnan,China.Mineralium Deposita,49(7):843-860.https://doi.org/10.1007/s00126-014-0513-8
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Feng,C.Y.,Zeng,Z.L.,Zhang,D.Q.,et al.,2011.SHRIMP Zircon U-Pb and Molybdenite Re-Os Isotopic Dating of the Tungsten Deposits in the Tianmenshan-Hongtaoling W-Sn Orefield,Southern Jiangxi Province,China,and Geological Implications.Ore Geology Reviews,43(1):8-25.https://doi.org/10.1016/j.oregeorev.2011.04.006
Gardiner,N.J.,Hawkesworth,C.J.,Robb,L.J.,et al.,2017.Contrasting Granite Metallogeny through the Zircon Record:A Case Study from Myanmar.Scientific Reports,7(1):748.https://doi.org/10.1038/s41598-017-00832-2
Gardiner,N.J.,Robb,L.J.,Morley,C.K.,et al.,2016.The Tectonic and Metallogenic Framework of Myanmar:A Tethyan Mineral System.Ore Geology Reviews,79:26-45.https://doi.org/10.1016/j.oregeorev.2016.04.024
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Gardiner,N.J.,Searle,M.P.,Robb,L.J.,et al.,2015.Neo-Tethyan Magmatism and Metallogeny in Myanmar--An Andean Analogue?.Journal of Asian Earth Sciences,106:197-215.https://doi.org/10.1016/j.jseaes.2015.03.015
Grassineau,N.V.,Mattey,D.P.,Lowry,D.,2001.Sulfur Isotope Analysis of Sulfide and Sulfate Minerals by Continuous Flow-Isotope Ratio Mass Spectrometry.Analytical Chemistry,73(2):220-225.https://doi.org/10.1021/ac000550f
Hall,R.,2002.Cenozoic Geological and Plate Tectonic Evolution of SEAsia and the SW Pacific:Computer-Based Reconstructions,Model and Animations.Journal of Asian Earth Sciences,20:353-431.https://doi.org/10.1016/s1367-9120(01)00069-4
Hou,Z.Q.,Zaw,K.,Pan,G.T.,et al.,2007.Sanjiang Tethyan Metallogenesis in S.W.China:Tectonic Setting,Metallogenic Epochs and Deposit Types.Ore Geology Reviews,31(1/2/3/4):48-87.https://doi.org/10.1016/j.oregeorev.2004.12.007
Hu,R.Z.,Wei,W.F.,Bi,X.W.,et al.,2012.Molybdenite Re-Os and Muscovite 40Ar/39Ar Dating of the Xihuashan Tungsten Deposit,Central Nanling District,South China.Lithos,150:111-118.https://doi.org/10.1016/j.lithos.2012.05.015
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