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http://dx.doi.org/10.9727/jmsk.2011.24.2.133

Occurrence of the Nb-Ta Ore Bodies in Pegmatites, Mujoo  

Kang, Min-Woo (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Kim, Ji-Hyun (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Choi, Jin-Beom (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.24, no.2, 2011 , pp. 133-143 More about this Journal
Abstract
In Mujoo area, the granitic pegmatites are developed in the granitic gneiss complex with Jurassic gneissic granites, where Nb-Ta mineralization were reported. Pegmatites are mainly composed of large crystals of quartz, feldspars of end-member orthoclase and albite, and muscovite. Nb-Ta minerals in study area are columbite (Nb > Ta) in composition. Chemistry of muscovites shows post-magmatic in origin and they are closely related with columbite. Large columbite, in pegmatites occurred with quartz and feldspars, while microcrystalline columbite is associated with muscovite. The Nb contents in large columbite are relatively higher than those in microcrystalline ones. Two pegmatites, 4~15 m in width and 120 m, 250 m in extension respective1y, are developed. Five drilling cores with total 600 m in length are finally obtained and revealed no possible potential for economic rare metals of Na-Ta deposits.
Keywords
Granitic gneiss; pegmatite; Na-Ta mineralization; columbite; drilling core;
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Times Cited By KSCI : 1  (Citation Analysis)
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