Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Palaeodepositional Environment of the Cretaceous Hampyeong Basin, Southwestern Korea

한반도 남서부 중생대 백악기 함평퇴적분지의 고퇴적환경연구

  • You, Hoan-Su (Faculty of Earth Systems and Environmental Science, Chonnam National University) ;
  • Kenrick, Paul (Department of Palaeontology, The Natural History Museum) ;
  • Koh, Yeong-Koo (Department of Earth Science Education, Chonnam National University) ;
  • Yun, Seok-Tai (Department of Earth Science Education, Chonnam National University) ;
  • Kim, Joo-Yong (Faculty of Earth Systems and Environmental Science, Chonnam National University) ;
  • Kim, Hai-Gyoung (Department of Science Education, Kwangju Teacher's University) ;
  • Chung, Chul-Hwan (Faculty of Earth Systems and Environmental Science, Chonnam National University) ;
  • Ryu, Sang-Ock (Faculty of Earth Systems and Environmental Science, Chonnam National University)
  • 유환수 (전남대학교 지구환경과학부) ;
  • ;
  • 고영구 (전남대학교 지구과학교육과) ;
  • 윤석태 (전남대학교 지구과학교육과) ;
  • 김주용 (전남대학교 지구환경과학부) ;
  • 김해경 (광주교육대학교 과학교육학과) ;
  • 정철환 (전남대학교 지구환경과학부) ;
  • 류상옥 (전남대학교 지구환경과학부)
  • Published : 2000.12.30
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Abstract

Abstrace: The palaeodepositional environment and age of the Cretaceous Hampyeong Basin (southwestern Korea) are reassessed based on new geochemical, lithological, sedimentological, and palaeobotanical data. Results indicate that the Hampyeong Basin was a tectonically active basin comprising predominantly fluvial and lacustrine sediments. Four distinctive facies types have been identified (acidic tuff, black shales/sandstones, red beds, intermediate tuff with tuffaceous conglomerate) and these reflect periods of significant environmental change within the basin and its neighbouring terrains. Volcanism driven by tectonic events provides a source for much of the sediment. The sedimentary sequences compare well with those in the neighbouring Haenam Basin. Sediments of volcanic origin are similar to those of the Neungju Formation of the Yuchon Group. The widespread occurrence of black shales is indicative of extended periods of deposition under anoxic conditions. Measurements of total organic carbon show that the values for the black shales (0.81% to 1.75%) are the average for petroleum source shales. Fossil plants occurred in the black shales and sandstones. The occurrence of platanoid leaves places these sediments in Oishi's angiosperm series, which is consistent with an Aptian/Albian or younger age.

중생대 백악기 함평분지의 고퇴적환경과 지질연대를 지화학, 암상 분포, 퇴적암석학 그리고 고식물학 측면에서 재고찰을 시도하였다. 연구 결과는 함평분지가 하성과 호성층으로 구성된 구조적으로 활동적인 분지였음을 시사한다. 이 분지에서는 주변 지형과 관련되어 분명한 환경 변화를 시사하는 산성응회암류, 흑색 셰일/사암상, 적색층, 응회암질 역암을 포함하는 중성응회암류 등 4가지 암상이 인지되었다. 구조적 운동에 수반하여 일어난 화산활동이 이들 퇴적층을 형성시킨 퇴적물을 주로 제공하였을 것이다. 이들 퇴적층들은 인접한 해남분지와 잘 대비된다. 그리고 화산성 기원의 퇴적물들은 유천층군에 해당하는 능주층의 경우와 유사하다. 분지 내에서 흑색 셰일의 광역적인 분포는 혐기성 환경 하에서 퇴적이 이루어졌음을 지시한다. 이들 암층에 있어서의 유기탄소의 함량(0.81%에서 1.75%)은 석유근원 셰일의 평균치 정도로 나타났다. 식물화석은 흑색셰일과 사암에서 산출된다. Platanoid류 잎 화석의 산출은 이들 퇴적층이 Oishi의 피자식물 계열 지층에 해당하며 시대상 Aptian/Albian 또는 보다 신기 지층임을 시사한다.

Keywords

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