진주지역의 진주층에 발달한 함화석층: 산상과 고환경 및 층서적 의미 = Fossil-bearing deposits in the Jinju Formation at Jinju: Occurrences, paleoenvironments and stratigraphic implications

다국어 초록 (Multilingual Abstract)

Sedimentary features and paleoenvironments of the fossil-bearing deposits in the lower part (Jiphyeon site) and the upper part (Jeongchon site) of the Jinju Formation at Jinju area are examined, and their stratigraphic implications are interpreted in relation with the sedimentary and paleontological occurrences of the Jinju Formation. Gastropod shell and plant fossil deposits occur at Jiphyeon site, and they are interpreted to have been formed on a mudflat to shallow lake associated with channels. The occurrence of the Jiphyeon fossil deposits implies that humid climatic condition inducing lake expansion was initiated in the beginning stage of the Jinju Formation after the deposition of the underlying Hasandong Formation to have been formed under arid condition.
At Jeongchon site insect fossil deposits are common and estherid and ostracod fossil deposits occur intermittently.
It is interpreted that turbidity flows influenced to the formation of these fossil deposits under persistence of lake environment with development of arid condition during the depositon. Considering the paleoenvironments of the fossil deposits at Jiphyeon and Jeongchon sites and overall stratigraphic occurrences of the Jinju Formation, the Jinju Formation is deemed to have been deposited under balanced-fill lake type basin. The lake expansion and subsequent retreat recorded during the development of the Hasadong-Jinju-Chilgok Formations might have been related to the paleoclimatic changes of warming-cooling-warming and the expansion of arid condition in eastern Asia during the early Albian.

국문 초록 (Abstract)

진주시 집현 지역의 진주층 하부와 정촌 지역의 진주층 상부에 발달한 함화석층을 대상으로 퇴적특성과 고환경을 분석하였으며, 이를 바탕으로 기보고된 진주층의 전반적인 퇴적특성 및 화석산출 특성 등과 연계하여이들 화석층이 가지는 층서적 의미를 해석하였다. 복족류패각화석층과 식물화석층이 나타나는 집현 지역의 함화석층은 하천이 수반된 이질평원과 천호저 기원의 퇴적층으로 해석된다. 집현 지역의 화석층들은 전반적으로건조한 기후가 우세했던 진주층 하위 하산동층의 퇴적이 끝나고 진주층의 퇴적시기로 넘어오면서 경상분지 내호수의 확장을 가져 온 습윤기후의 우세한 발달이 시작된 결과로 해석된다. 정촌 지역의 함화석층은 전반적으로 곤충화석층이 반복적으로 발달한 가운데에 엽지개와 개형충화석층이 간헐적으로 나타난다. 정촌 지역 화석층의 형성에는 호저로 유입된 저탁류가 전반적으로 영향을 미친 것으로 해석되며, 퇴적과정에는 건조 기후가발달하는 가운데에 호수환경은 일정기간 지속적으로 유지된 것으로 해석된다. 집현 지역과 정촌 지역 진주층함화석층의 고환경 특성과 진주층 전반의 층서 특성을 종합적으로 고려할 때, 진주층의 퇴적은 balanced-fill lake 성격의 분지에서 이루어진 것으로 해석된다. 한편 하산동층-진주층-칠곡층 발달과정에서 일어난 경상분지내 호수의 확장과 축소 기록은 앨비안 초기에 나타나는 온난화-한랭화-온난화의 기록 및 동아시아 지역에서의건조기후 확장 기록과 연관이 있을 것으로 해석된다.

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