Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Depositional Environment of the Ordovician Yeongheung Formation near Machari Area, Yeongweol, Kangweondo, Korea

강원도 영월군 마차리 부근에 분포하는 오오도비스기 영흥층의 퇴적환경

Choi, Seung-Jin;Woo, Kyung-Sik
최승진;우경식

  • Published : 19930800

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Abstract

The Yonghung Formation of the Choseon Supergroup near Machari area in Yeongweol, Kangweondo, Korea, can be divided into 8 lithofacies based on lithology, sedimentary structure and texture. Each lithofacies represents a corresponding depositional environment as follows: 1) laminated dolomite lithofacies-supratidal, 2) solution-collapsed breccia lithofacies-supratidal, 3) massive black fine dolomite lithofacies-supratidal to upper intertidal, 4) flat pebble conglomerate lithofacies-supratidal to upper intertidal, 5) argillaceous limestone lithofacies-intertidal to supratidal, 6) wackestone to grainstone lithofacies-subtidal, 7) bioturbated limestone lithofacies-subtidal, 8) stromatolite lithofacies-supratidal to subtidal. The Yeongheung Formation shows four transgressive cycles from the base. Each cyclic unit is about 30 to 150m thick. This cyclicity appears to have resulted from relative sea-level change and/or subsidence rather than sedimentation rate.

강원도 영월군 마차리 부근에 분포하는 조선누층군의 중부 오오도비스기 영흥층은 방길, 의적구조 및 방석의 조직적 관찰 결과 8개의 암상으로 구분되며 다음과 같은 퇴적환경을 나타낸다: 1) 엽층리 돌로마이트 암상-초조간대, 2) 붕락-각력암 암상-초조간대, 3) 괴상 흑색 세립질 돌로마이트 암상-초조간대, 4) 판상 역암 암상-초조간대 내지 상부 조간대, 5) 이질석회암 암상- 조간대 내지 아조간대, 6) 와케스톤 내지 입자암 암상-아조간대, 7) 생란구조 석회암 암상-아조간대 및 8) 스트로마토라이트 암상-초조간대 내지 아조간대. 영흥층은 이와 같이 초조간대에서 아조간대에 이르는 해침상의 퇴적윤회층이 네 차례에 걸쳐 반복되어 나타나며, 단위 윤회층의 규모는 약 30m 내지 150m의 층후를 이룬다. 이러한 대규모의 퇴적 윤회층은 퇴적속도 보다는 상대적인 해수면의 변동이나 침강에 의한 것으로 사료된다.

Keywords

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