Geology, mineralogy, ore paragenesis, and molybdenite Re-Os geochronology of Sn-W (-Mo) mineralization in Padatgyaung and Dawei, Myanmar: Implications for timing of mineralization and tectonic setting

Myint, Aung Zaw; Li, Huan; Mitchell, A. H. G.; Selby, David; Wagner, Thomas

doi:10.1016/j.jseaes.2021.104725

Cited by 11 publications

(20 citation statements)

References 53 publications

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“…In the Dawei Sn-W region, two parallel igneous suites are exposed as linear, NNW-SSE striking linear granite ranges (Figure 2a), which intrude the metasediments of the Mergui Group, as part of MMB II (Myint, Li, et al, 2021;Myint, Yonezu, et al, 2021). MMB I is absent in the region, although float of schists and calc-silicate rocks are F I G U R E 1 (a) Simplified tectonic subdivision map of Myanmar and the adjacent countries (adapted from Gardiner et al, 2016Gardiner et al, , 2018.…”

Section: Dawei Sn-w (-Mo) Regionmentioning

confidence: 99%

“…Li, Myint, et al, 2018;J. X. Li, Zhang, et al, 2018;Mitchell et al, 2012;Myint et al, 2017;Myint, Li, et al, 2021;M. P. Searle et al, 2007), is manifested as large batholiths through the central part of Myanmar-these granites intrude the metamorphosed arc-like strata of the Mogok Metamorphic Belt (MMB I; Mitchell et al, 2007;D.…”

Section: Western Granite Provincementioning

confidence: 99%

“…P. Searle et al, 2007), is manifested as large batholiths through the central part of Myanmar-these granites intrude the metamorphosed arc-like strata of the Mogok Metamorphic Belt (MMB I; Mitchell et al, 2007;D. L. Searle & Haq, 1964), as well as the sedimentary rocks of the Mergui-Mawchi Belt (MMB II; Mitchell et al, 2004;Myint, Li, et al, 2021) (Figure 1). MMB I formed along the western margin of Sibumasu, a terrane comprising sequences of marbles, calc-silicate rocks, schists, quartzites, gneisses and migmatites (Mitchell et al, 2007;M.…”

Section: Western Granite Provincementioning

confidence: 99%

“…L. Searle & Haq, 1964). MMB II comprises Carboniferous to Early Permian glaciomarine diamictites, including sedimentary rocks and their metasedimentary equivalents defined as the Mawchi, Lebyin, Taungnyo and Mergui Groups in Myanmar (Bender, 1983;Mitchell et al, 2004;Myint et al, 2018;Myint, Li, et al, 2021). The Sn-W mineralization is spatially and genetically related to the MMB II-hosted peraluminous granitic rocks of the WGP.…”

Section: Western Granite Provincementioning

confidence: 99%

“…Li, Myint, et al, 2018;J. X. Li, Zhang, et al, 2018;Mao et al, 2020;Myint, Li, et al, 2021). Two distinct Sn-rich and W-Mo ore belts are recognized, both related to an Early Cretaceous hydrothermal event that resulted in the formation of medium-to small-sized deposits.…”

Section: Western Granite Provincementioning

confidence: 99%

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Petrogenesis of Sn–W mineralized granites in the Dawei and Mawchi, regions of Myanmar

Myint,

Cai,

Robb

et al. 2024

Geological Journal

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The Palaeocene granites of Dawei and the Eocene granites of Mawchi both host large‐ to medium‐scale Sn–W deposits and represent two metallogenically prominent segments of the SE Asian tin belt in Myanmar. Combined with previous geochemical data, new whole‐rock elemental and isotope analyses of tin‐mineralized granites were obtained to provide insights into sources involved in the formation of these granites. Tin granites in both regions are highly siliceous (76–80 wt%), peraluminous (A/CNK = 1.02–1.32), depleted in Sr, Ba, Zr and Ti but elevated in Li, Sn, Rb, Pb and U. The highly evolved nature of these granites is emphasized by their high Y/Ho (33–49) ratios as well as low Nb/Ta (1–11) and Zr/Hf (8–24) ratios. The chondrite‐normalized REE patterns, with M‐type tetrad effects (TE1,3 = 1.04–1.16) and strongly negative Eu anomalies (0.01–0.34), point to fractional crystallization of feldspars and other accessories during the evolution of the parental magma and are also indicative of the magmatic to hydrothermal transition that resulted in the pervasive mineralization of these bodies. The Pb isotopic compositions are variably enriched, with age‐corrected 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values ranging from 18.620 to 18.898, 15.728 to 15.770, and 38.288 to 39.402, respectively, all of which point to derivation from evolved crustal material. This is consistent with their low ɛNd(t) and ɛHf(t) values of −10.11 to −11.29, and −5.86 to −8.93, respectively. Collectively, these data suggest that crustal melting, fractional crystallization and late‐stage magma–fluid interactions all played important roles in the generation of the tin‐mineralized granites of Myanmar.

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Section: Dawei Sn-w (-Mo) Regionmentioning

confidence: 99%