Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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A Review on the Stratigraphy, Depositional Age, and Composition of the Chungnam Basin Fills

충남분지 충전물의 층서, 퇴적시기, 조성에 관한 고찰

  • Lee, Hyojong (School of Earth and Environmental Sciences, Seoul National University) ;
  • Park, Seung-Ik (Department of Geology, School of Earth System Science, Kyungpook National University) ;
  • Choi, Taejin (Department of Energy and Resources Engineering, Chosun University)
  • 이효종 (서울대학교 지구환경과학부) ;
  • 박승익 (경북대학교 지구시스템과학부 지질학전공) ;
  • 최태진 (조선대학교 에너지자원공학과)
  • Received : 2019.09.27
  • Accepted : 2019.10.04
  • Published : 2019.10.28
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Abstract

Deposition of the Daedong Supergroup has been considered to be related with the Triassic Songrim and Jurassic Daebo orogenies. The Chungnam Basin fills is an important sedimentary succession to understand the geological evolution of the Early to Middle Mesozoic Korean Peninsula. Previous paleontological and paleomagnetic studies have suggested the Late Triassic to Early Jurassic sedimentation of the Chungnam Basin fills. However, the orogenic model of the basin development has remained controversial because recently reported zircon U-Pb isotopic ages are not harmonious with the previous studies. This paper aims to review the stratigraphy, depositional age, and composition of the Chungnam Basin fills, together with test of the basin development models.

대동누층군은 삼첩기 송림조산운동과 쥬라기 대보조산운동으로 대표되는 두 차례의 광역적인 중생대 지각변형과 관련하여 퇴적되었다. 한반도 남부의 대동누층군을 대표하는 충남분지 충전물은 전기-중기 중생대의 한반도 지질진화사를 이해하는데 있어 매우 중요한 연구 대상이다. 식물화석 및 고지자기를 기반으로 한 과거 연구들은 충남분지 충전물의 퇴적시기가 대체로 후기 삼첩기로부터 전기 쥬라기 사이에 해당하는 것으로 해석하였다. 그러나 저어콘 U-Pb 연대측정 결과에 기반한 퇴적시기가 기존의 해석과 불일치함에 따라 충남분지의 발달과 조산운동과의 관계에 대한 논쟁의 여지가 있어 왔다. 본 논문은 충남분지 충전물의 퇴적시기, 층서, 조성에 대한 최근까지의 연구결과를 다루면서, 분지발달 모델이 갖는 문제점을 함께 고찰하였다.

Keywords

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