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http://dx.doi.org/10.9727/jmsk.2013.26.4.263

Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities  

Yoo, Jang Han (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Koh, Sang Mo (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Moon, Dong Hyeok (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.26, no.4, 2013 , pp. 263-272 More about this Journal
Abstract
The Taebaegsan region and its vicinities mainly consist of Precambrian granitic gneisses and Cambrian meta-sedimentary rocks. And lots of leucocratic(alkali) granites smaller than the stocks are found here and there. Therefore the presence of leuco-granites is not properly described yet in the former studies. For the effective distinction of several granitic rocks, outcrop characteristics, mineral identification, and petro-chemical properties were studied. Some part of granitc gneisses could be classified into typical metamorphic rocks such as migmatites and banded gneisses. And some shows rather dark appearance with gray quartz and feldspars, and others two mica granites, leucocratic ones etc. But all of leucocratic granites of the region usually show bright milky white to beige color. Since they mainly consist of quartz, feldspars, muscovite, and small amounts of sericites, amphiboles, tourmaline and lepidolite. And all of alkali granites belong to the calc-alkalic, peraluminous and S-type in character. During magmatic differentiation of leucocratic granites, CaO and total Fe contents are clearly decreased than those of the older granitic rocks. On the other hand, magmatic evolution also had induced the greisenization and albitization which enriched the relative amounts of alkali elements such as $K_2O$ and $Na_2O$.
Keywords
leucocratic(alkali) granite; albitization; greisenization;
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