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

영남 육괴 북동부 변성퇴적암과 흑운모 화강편마암의 변성 온도-압력 조건과 전압 붕소 함량사이의 상관관계

  • 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)
  • 정원석 (한국기초과학지원연구원 연대측정팀) ;
  • 선광민 (한국원자력연구원 원자로시스템기술개발본부) ;
  • 나기창 (충북대학교 자연과학대학 지구환경과학과)
  • Published : 2009.06.28

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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