Geochronology of Sn mineralization in Myanmar; metallogenic implications

Myanmar, the third largest global tin supplier, is an important component of the Southeast Asian tin province. We have conducted laser ablation-inductively coupled plasma-mass spectrometry U-Pb dating of cassiterite, wolframite, and zircon and Re-Os dating of molybdenite from six primary and two pla...

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Published in:	Economic geology and the bulletin of the Society of Economic Geologists Vol. 117; no. 6; pp. 1387 - 1403
Main Authors:	Mao Wei, Mao Wei, Zhong Hong, Zhong Hong, Yang Jiehua, Yang Jiehua, Liu Liang, Liu Liang, Fu Yazhou, Fu Yazhou, Zhang Xingchun, Zhang Xingchun, Tang Yanwen, Tang Yanwen, Li Jie, Li Jie, Zhang Le, Zhang Le, Sein Kyaing, Sein Kyaing, Soe Myint Aung, Soe Myint Aung, Saw Mu Tha Lay Paw, Saw Mu Tha Lay Paw, Saw Hpa Doh, Saw Hpa Doh
Format:	Journal Article
Language:	English
Published:	Economic Geology Publishing Company 01-09-2022
Subjects:	absolute age Asia Burma Bwabin Deposit cassiterite cathodoluminescence chemical composition Cretaceous eastern Burma Economic geology Far East granites Hermyingyi Deposit hydrothermal alteration ICP mass spectra igneous rocks laser ablation laser methods Lower Cretaceous mass spectra Mawchi Mine Mesozoic metal ores metals metasomatism mineralization Mong Kan Noi Deposit Naypyitaw Deposit nesosilicates orthosilicates oxides Padatchuang Deposit Pagaye Deposit placers plutonic rocks Pyimana Myanmar quartz veins Re/Os Shan Plateau silicates spectra Tengchong Block Tethys thermal ionization mass spectra tin ores Triassic tungstates U/Pb Upper Triassic veins wolframite zircon zircon group
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Summary:	Myanmar, the third largest global tin supplier, is an important component of the Southeast Asian tin province. We have conducted laser ablation-inductively coupled plasma-mass spectrometry U-Pb dating of cassiterite, wolframite, and zircon and Re-Os dating of molybdenite from six primary and two placer Sn deposits in Myanmar. A combination of our geochronological data with previous studies revealed that three episodes of Sn mineralization in the Western tin belt of Southeast Asia formed during the closure of multiple Tethys oceans, namely the Late Triassic (∼218 Ma) mineralization in a collisional setting after closure of the Paleo-Tethys, the Early Cretaceous (∼124-107 Ma) mineralization during subduction of the Meso-Tethys, and the Late Cretaceous to Eocene (∼90-42 Ma) mineralization related to the Neo-Tethys subduction. Recurrent Sn mineralization is recorded not only in the Western tin belt but also in the Central and Eastern tin belts in Southeast Asia. Compilation of currently available cassiterite U-Pb ages from all over the world revealed that durations of regional Sn mineralization events are typically in the range of ∼5-30 m.y., whereas the Neo-Tethys subduction in Southeast Asia generated prolonged Sn mineralization lasting up to ∼50 m.y. The Southeast Asian tin province, as a whole, has the longest cumulative episodes of mineralization, compared to other Sn provinces. The Sn mineralization ceased in the late Eocene when the tectonic setting changed from Neo-Tethys subduction to dextral motion along a series of strike-slip faults and extrusion of the Indochina block in Southeast Asia.
ISSN:	0361-0128 1554-0774
DOI:	10.5382/econgeo.4927