한국석유지질학회지 (The Korean Journal of Petroleum Geology)
- 제4권1_2호
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- Pages.12-19
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- 1996
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- 1225-6927(pISSN)
한국 의성소분지 북동부 백악기 하양층군의 고수류
Paleocurrent Analysis of the Cretaceous Hayang Group in the Northeastern Part of Euiseong Subbasin, Southeast Korea
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Koh In Seok
(Department of Geology, College of Natural Sciences, Kyungpook National University) ;
- Lee Yong Tae (Department of Geology, College of Natural Sciences, Kyungpook National University) ;
- Shin Young Sik (Department of Geology, College of Natural Sciences, Kyungpook National University)
- 발행 : 1996.12.01
초록
백악기 의성소분지 북동부 하양층군 (일직층, 후평동층, 점곡층)에서 관찰된 방향성 퇴적구조는 하도구조, 곡상사층리, 판상사층리, 사엽층리 및 유수연흔 등이다. 이들 퇴적구조들은 주로 세립사암으로부터 역질의 극조립사암에 발달한다. 대소규모의 하도구조는 모든 층에서 ,하도구조와 곡상사층리는 일직층 (충적선상지 환경)에서 , 판상사층리 , 판상사엽층리 , 유수연흔은 후평동층 (범람원 환경)과 점곡층 (호수변 환경) 하부에서 자주 관찰된다. 연구지역에서 측정한 4깨의 방향성 퇴적구조들의 벡타평균 방향은
Directional sedimentary structures (channel structure, cross stratification, and current ripple) were observed in fine to gravelly ye.y coarse sandstones of the Cretaceous Mayans Group (lljig, Hupyeongdong, and Jeomgok formations) in the northeastern part of Euiseong subbasin of Kyongsang basin, Southeast Korea. Large and small scale channel structures are common in all formations. Trough cross-stratification and channel structure frequently occur in the lljig formation (proximal fluvial deposit), whereas planar cross- stratification, cross lamination, and current ripple occur abundantly in the Hupyeongdong and Jeomgok formations (distal braided fluvial to marginal lacustrine deposits). The paleocurrent directions inferred from a statistical analysis of total 43 directional sedimentary structures show a mean azimuth of