Mineralogical Chemistry of Granitoids and Pegmatites in the Sangdong and the UIchin Areas

상동 및 울진지역 화강암질암과 페그마타이트의 광물화학

  • Chon, Hyo-Taek (Department of Mineral & Petroleum Engineering, Seoul National University) ;
  • Son, Chang-Il (Department of Mineral & Petroleum Engineering, Seoul National University)
  • 전효택 (서울대학교 공과대학 자원공학과) ;
  • 손창일 (서울대학교 공과대학 자원공학과)
  • Received : 1995.01.06
  • Published : 1995.02.28

Abstract

Tin mineralizations in South Korea have been found only in the Ulchin and the Sangdong areas. The Wangpiri and the Yuchang Sn pegmatites appear to be in close spatial and genetical relation to the Wangpiri granitoid in the Ulchin area, and the Soonkyeong Sn pegmatite be in close association with the Nonggeori granites in the Sangdong area from geochemical viewpoint. The electron-microprobe analysis of muscovite, biotite, tourmaline and cassiterite from the granitoids and pegmatites in the Ulchin and the Sangdong areas has revealed a distinct differences of geochemical compositions. The Wangpiri and the Yuchang Sn pegmatites show an enrichment of MnO and a depletion of $TiO_2$, FeO and MgO in comparison with the Soonkyeong Sn pegmatite. This result coincides with the geochemical compositions of granitoid rocks in these areas. Enrichment of MnO and depletion of $TiO_2$ FeO and MgO are characteristic in muscovite, biotite and tourmaline of pegmatites compared with those of granitoids. These geochemical differences of muscovite, biotite and tourmaline between granitoids and pegmatites in these areas implies that pegmatites are more fractionated than granitoids.

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Acknowledgement

Supported by : 한국과학재단