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http://dx.doi.org/10.9719/EEG.2017.50.6.423

A Geochemical Indicator in Exploration for the Kalaymyo Chromitite Deposit, Myanmar  

Park, Jung-Woo (School of Earth and Environmental Sciences, Seoul National University)
Park, Gyuseung (School of Earth and Environmental Sciences, Seoul National University)
Heo, Chul-Ho (Mineral Resources Development Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Jihyuk (School of Earth and Environmental Sciences, Seoul National University)
Publication Information
Economic and Environmental Geology / v.50, no.6, 2017 , pp. 423-433 More about this Journal
Abstract
Korea Institute of Geoscience and Mineral Resources and Department of Geological Survey and Mineral Exploration in Myanmar have explored the Kalaymyo chromitite deposit, Myanmar since 2013. It is now necessary to find a geochemical indicator for efficient mineral exploration in the future and building a 3D geological model for this ore deposit. Mantle podiform chromitite is a major type of Cr ore in this region, which is considered to be formed by mantle-melt interaction beneath the mantle-crust boundary of oceanic lithosphere. In this study we measured major element composition of spinels in harzburgite, dunite and chromitite, and examined the hypothesis that spinel Cr#(molar Cr/(Cr+Al)${\times}$100) can be used as a geochemical indicator in exploration for the Kalaymyo chromitite. The results show that there is a clear correlation between spinel Cr# and distribution of chromitite. The spinel Cr# of harzburgite increases with decreasing the distance from the chromitite bodies. The spinel composition is also closely associated with texture and occurrence of spinels. The high Cr# spinels (30-48) are subhedral to euhedral and enclosed by olivine whereas the low Cr# spinels (16-27) are anhedral and commonly associated with pyroxenes. Often the low Cr# spinels show symplectite intergrowths with pyroxenes, indicating their residual nature. These petrological and geochemical results suggest that the high Cr# spinels have resulted from mantle-melt interaction. We suggest that spinel Cr# can be used as a geochemical indicator for Cr ore exploration and as one of critical factors in 3D geological model in the Kalaymyo chromitite deposit.
Keywords
Chromitite; Geochemical indicator; Spinel; Mineral exploration; Myanmar;
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Times Cited By KSCI : 1  (Citation Analysis)
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