용화(龍化)-설천(雪川) 지역(地域)에 분포하는 백악기 반상화강암(斑狀花崗岩)의 암석화학(岩石化學) 및 유체포유물(流體包有物)에 관한 연구(硏究)

Petrochemical and Fluid Inclusion Study on the Porphyritic Granite in the Yonghwa-Seolcheon Area

  • 윤석태 (전남대학교 지구과학교육과) ;
  • 박희인 (서울대학교 지질과학과)
  • Youn, Seok-Tai (Dept. of Earth Science Education. Chonnam National Univ.) ;
  • Park, Hee-In (Dept. of Geological Science. Seoul National Univ.)
  • 투고 : 1995.08.23
  • 발행 : 1995.10.30

초록

The petrochemical data of the porphyritic granites of Cretaceous age in the Yonghwa-Seolcheon area show the trend of subalkaline magma, calc-alkaline magma, I-type granitoid and magnetite series. This granite is the relevant igneous rock of gold-silver mineralization in this mining district Fluid inclusions have been studied in phenocryst quartz from the Cretaceous porphyritic granite. Three main types of fluid inclusion were found : liquid-rich inclusion(I type), gas-rich inclusion(II type) and solid-bearing inclusions(III-A, III-B). The solid-bearing inclusions(III-A,B) represent the earliest trapped fluids. They have salinities between 41.0 and 67.5 wt% equivalent to NaCl. These are high saline inclusions containing NaCl and KCl daughter crystals. Homogenization temperature inferred from the fluid inclusion study ranges from 650 to $75^{\circ}C$ Type I and II inclusions were observed within the same fracture. This cause for these differences in degree of filling is evidence of boiling. Salinities of type I and II inclusions range from 9.87 wt% to 15.29 wt%, from 8.40 wt% to 14.64 wt% NaCl equivalent, respectively.

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