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Relation between Metamorphic P-T Conditions and Boron Concentrations of Metasedimentary Rocks and Biotite Granitic Gneisses from NE Yeongnam Massif around Samcheok Area, South Korea  

Cheong, Won-Seok (Korea Basic Science Institute, Geochronology Team)
Sun, Gwang-Min (Korea Atomic Energy Research Institute)
Na, Ki-Chang (Department of Earth & Environmental Science, College of natural Science, Chungbuk National University)
Publication Information
Economic and Environmental Geology / v.42, no.3, 2009 , pp. 247-259 More about this Journal
Abstract
This study is focused on the relationship between whole rock boron contents and metamorphic P-T conditions of metasedimentary rocks from northeastern Yeongnam massif around Samcheok area, Korea. Metamorphic P-T conditions of sillimanite and garnet zones based on the Ti-biotite geothermometer is 553-687$^{\circ}C$ and 582-722$^{\circ}C$ at 4-6 kbar, respectively. In the metasedimentary rocks, boron contents in whole rock decrease with increasing metamorphic grade, from sillimanite zone (9.60-189 ppm B) to garnet zone (2.63-15.97 ppm B), except one sample (90.9 ppm B) from garnet zone containing graphites. Boron depletion in garnet zone has relation with mode of tourmaline which are broken down with increasing metamorphic temperature. Boron contents are indirectly proportional to major and trace elements such as $Al_2O_3$, MgO, $Fe_2O_3$, $K_2O$, Li, Ba, Sc, Co, Cr, Rb and Cs that are abundant in tourmalines. In conclustion, tourmalines and graphite are modulator of boron contents in metasedimentary rocks. In the biotite granitic gneisses, boron contents (2.62-12.2 ppm B) are similar or lower than those of metasedimentary rocks and have no relation with metamorphic P-T conditions.
Keywords
Yeongnam massif; metasedimentary rocks; biotite granitic gneiss; boron; tourmaline;
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