암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
권호 표지

중부 옥천변성대의 변성진화: 최근의 연구결과 논평 및 문제점

Metamorphic Evolution of the Ogcheon Metamorphic Belt: Review of Recent Studies and Remaining Problems

  • 조문섭 (서울대학교 자연과학대학 지구환경과학부) ;
  • 김현철 (서울대학교 자연과학대학 지구환경과학부)
  • 발행 : 2002.12.01
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⟨ 이전 논문 다음 논문 ⟩

초록

옥천변성대의 변성진화사를 밝히기 위한 연구는 지난 수십여년간 많은 학자들에 의해 수행되어 왔다. 그 결과 옥천변성대의 변성조건이 약 $490-630^{\circ}C$, 4.2-9.4 kbar에 해당되는 중온-중압형에 속함이 밝혀졌고, 또한 시계방향의 압력-온도-시간 경로를 경험했음이 알려졌다. 이러한 결과는 드러스트 나페에 의해 옥천변성대의 지각 두께가 증가했음을 지시한다. 그러나 변성작용에 관련된 조산운동을 규명하는데는 여러 가지 어려움이 남아 있다 특히 변성시기에 대한 논란은 오랫동안 거듭되어 왔으며, 최근의 연구 결과는 옥천변성대의 최고변성작용 시기를 석탄기와 페름기의 경계 부근인 약 300-280 Ma로 규정짓는다 따라서 옥천변성대와 태백산분지는 별개의 지구조구로서 서로 다른 진화 과정을 겪었으리라 추정되며, 이들은 약 250-220 Ma사이에 봉합되어 옥천대를 형성했을 가능성이 있다. 이와 같은 결과는 옥천대의 진화과정에 대한 기존의 생각과 일부 배치되며 새로운 지체구조적 파라다임을 요구한다. 또한 옥천대가 일본의 히다연변대-히다변성대에 대비될 수 있음을 시사한다.

Metamorphic evolution of the Ogcheon metamorphic belt has been studied by many investigators for the past few decades. P-T conditions of the Ogcheon metamorphic belt were estimated as 4.2-9.4 kbar and $490-630^{\circ}C$, corresponding to the medium-pressure type. In addition, the clockwise P-T-t path suggests a crustal-thickening event in association with the formation of thrust nappes. However, some details on deformation and orogeny of the Ogcheon metamorphic belt have been ambiguous yet. Although the metamorphic age has been also equivocal, recent isotopic studies strongly suggest that the peak metamorphism in the Ogcheon metamorphic belt has occurred at ca. 300-280 Ma between Late Carboniferous and Early Permian. It is thus inferred that the Ogcheon metamorphic belt and the Taebaegsan basin have evolved as separate terranes and that both were sutured at ca. 250-220 Ma. These results are partly in contrast with those of previous workers and require a revised framework for tectonic evolution of the Ogcheon belt. In addition, it is likely that the Ogcheon belt is correlative with the Hida marginal belt and the Hida metamorphic belt.

키워드

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