Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Evidence for Hypersaline Conditions in the Middle Ordovician Yeongheung Formation, Korea

중기 오오도비스기 영흥층에 나타나는 고염도의 증거

Yoo, Chan-Min;Lee, Yong-Il;Paik, In-Sung
유찬민;이용일;백인성

  • Published : 19940800

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Abstract

Many diagnostic sedimentary textures and structures are observed to infer the climatic and salinity conditions during deposition of the Middle Ordovician Yeongheung Formation. They are various forms of evaporite mineral and nodule pseudomorphs, enterolithic folds, solution - collapse breccias, tepee structures, oolitic grainstones, and cryptalgalaminites. Extensive development of algal mats (cryptalgalaminite) and the presence of oolitic grainstones, along with paucity of bioclasts and bioturbations in tidal - flat sediments, are suggestive of hypersaline conditions during deposition of the Yeongheung Formation. Development of abundant evaporite pseudomorphs and some evaporite - related structures, such as enterolithic folds and solution - collapse breccias, suggests that the climate was dry enough to produce some growths of evaporite minerals within the tidal-flat sediments. Evaporation - dominating, dry climate conditions are also indicated by extensive dolomitization of tidal - flat facies and presence of tepee structure. The above lines of evidence suggest that hypersaline and evaporation - dominating, dry climate conditions were maintained during deposition of the Middle Ordovician Yeongheung Formation. Comparison with other sedimentary sequences of a comparable age also supports this interpretation.

중기 오오도비스기 영흥층내에는 퇴적당시의 기후와 염도조건을 지시해 주는 특징적인 퇴적구조들이 많이 나타난다. 이들은 다양한 형태의 증발잔류암의 흔적, 엔테로리딕 습곡(enterolithic fold), 붕락각력암, 티피 (tepee) 구조, 어란상 입자암, 크립트알갈라미나이트(cryptalgalaminite) 등이다. 크립트알갈라미나이트의 광범위한 발달, 어란상 입자암의 존재, 그리고 조간대 퇴적물내에 생쇄설성 퇴적물과 생란작용의 흔적이 나타나지 않는 사실은 영흥층이 퇴적될 당시에 염도가 높은 환경이 유지되었음을 지시한다. 많은 증발잔류암의 흔적과 증발잔류암과 관련된 구조(엔테로리딕 습곡, 붕락 각력암)의 존재는 조간대 퇴적물내에서 증발잔류암이 성장할 수 있을 정도로 건조한 기후가 지속되었음을 나타낸다. 또한 조간대 퇴적물이 광범위한 백운석화 작용을 받아있는 사실과 티피구조의 발달도 증발작용이 우세한 건조기후였음을 지시한다. 이들 구조들을 토대로 중기 오오도비스기 영흥층이 퇴적될 당시에는 염도가 높고 건조한 기후가 지속되었음을 알 수 있다. 동시기의 다른 퇴적기록들과의 비교도 역시 이러한 해석을 뒷받침해 준다.

Keywords

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