Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Paleostress from Healed Microcracks and Fluid Inclusions in Quartz of the Jurassic Granites in the Southwestern Ogcheon Folded Belt

옥천습곡대 서남부지역에 분포하는 쥬라기 화강암류의 석영내 아문 미세균열 및 유체포유물을 이용한 고응력장

  • Kang, Seong-Seung (Resources Engineering, Chosun University) ;
  • Yoo, Bong-Chul (Department of geology and environmental sciences, Chungnam National University) ;
  • Jang, Bo-An (Department of geophysics, Kangwon National University) ;
  • Kim, Cheong-Bin (Division of Science and Environmental Education, Sunchon National University)
  • 강성승 (조선대학교 자원공학과) ;
  • 유봉철 (충남대학교 지구환경과학과) ;
  • 장보안 (강원대학교 지구물리학과) ;
  • 김정빈 (순천대학교 과학.환경교육학부)
  • Published : 2009.02.28
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Abstract

Paleostress was interpreted by analyzing the healed microcracks and the secondary fluid inclusions in quartz of the Jurassic granites distributed in the southwestern Ogcheon Folded Belt, South Korea. The most dominant direction of healed microcracks in the study area was oriented $N30^{\circ}W$, and $N70^{\circ}W$ direction was also recognized. The formation temperatures of fluid inclusions were ranged $380-550^{\circ}C$ and the age of healed microcrack formations might have been approximately 166-200 Ma. Comparing the paleostress orientation obtained from the direction of healed microcracks to the formation age of healed microcracks estimated from the secondary fluid inclusions, it is considered that granitic rock body in study area was subject to a maximum horizontal principal stress along the NNW-SSE and WNW-ESE directions in the early Jurassic to middle Jurassic.

옥천습곡대의 서남부지역에서 분포하는 쥬라기 화강암류의 석영내에 존재하는 아문 미세균열과 유체표유물을 분석하여 이 지역에 작용한 고응력장을 해석하였다. 연구지역에서 나타나는 아문 미세균열의 방향성은 전체적으로 $N30^{\circ}W$의 방향이 가장 우세하며 $N70^{\circ}W$의 방향도 나타난다. 연구지역의 아문 미세균열 생성온도는 $380-550^{\circ}C$ 범위를 보이며, 이들 아문 미세균열은 약 166-200Ma의 기간 동안 형성되었을 것으로 추정된다. 아문 미세균열의 방향성을 통한 고응력장의 작용 방향과 유체포유물에 의한 아문 미세균열의 형성시기를 비교하여 볼 때, 연구지역 내에서 발달하는 화강암질암체는 NNW-SSE와 WNW-ESE 방향의 최대수평주응력인 고응력장이 쥬라기 초기에서 쥬라기 중기 기간 동안 작용하였을 것으로 사료된다.

Keywords

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