Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Quaternary Diatom Assemblages from Sediment Core GC 98-06 in the Southern Drake Passage, Antarctica

드레이크 해협 남부 코어퇴적물에서 산출된 제 4기 규조 화석 연구

  • Lee, Jong-Deock (Department of Earth & Environmental Sciences, Chonbuk National University) ;
  • Yoon, Ho-Il (Polar Research Center, KORDI) ;
  • Yun, Hye-su (Department of Geology, Chungnam National University) ;
  • Kim, Hyo-Jeong (Department of Earth & Environmental Sciences, Chonbuk National University) ;
  • Bak, Young-Suk (Department of Earth & Environmental Sciences, Chonbuk National University)
  • 이종덕 (전북대학교 자연과학대학 지구환경과학과) ;
  • 윤호일 (한국 해양연구원 극지연구센터) ;
  • 윤혜수 (충남대학교 자연과학대학 지질학과) ;
  • 김효정 (전북대학교 자연과학대학 지구환경과학과) ;
  • 박영숙 (전북대학교 자연과학대학 지구환경과학과)
  • Published : 2002.06.29
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Abstract

A total of 64 species belonging to 23 genera of diatom fossils are identified from the Core GC 98-06 in the southern Drake Passage, Antarctica. The diatom assemblages are dominated by Actinocyclus actinochilus, Coscinodiscus asteromphalus, Eucampia antarctica, Fragilariopsis kerguelensis, Thalassiosira lentiginosa, T. ritscheri and T. anguste-lineata, which are about 73% of the assemblage. Open water species are more abundant than sea ice species in the diatom assemblages of the core. Fragilariopsis. kerguelensis and Thalassiosira lentiginosa are valuable indicators of the habitats. Especially, F. kerguelensis represent the influence of waters from the Antarctic Circumpolar Current. Sea ice taxa represents the influence of cold waters from Bransfield Strait Water and melt water from the sea-ice at during warm periods. The reworked diatoms such as Denticulopsis dimopha (Miocene) and D. hustedtii (Pliocene) are occurred with Quaternary species (Actinocyclus actinochilus, Fragilariopsis kerguelensis, Thalassiosira lentiginosa, and T. glacilis). The presence of reworked diatoms indicates the transportation of the older diatoms into the Drake passage from the circumference sediments, due to strong bottom current activity of Antarctic circumpolar deep water.

남극 드레이크해협 남부에서 채취한 코아퇴적물(GC 98-06)로부터 32개의 시료를 얻어 고생물학적으로 연구한 결과 총 23속 64종의 규조 미화석이 감정되었다. 산출된 규조 미화석의 군집 조성 중 Actinocyclus actinochilus, Coscinodiscus asteromphalus, Eucampia antarctica, Fragilariopsis kerguelensis, Thalassiosira lentiginosa, T. ritscheri와 T. anguste-lineata 등이 우점종으로 전체 군집의 73%를 차지한다. 공해환경을 지시해 주는 종들이 Bransfield Strait Water에 의해 유입된 해빙종들에 비해서 다량 산출되며, 제 4기 지시종과 제 3기의 마이오세와 플라이오세를 지시해주는 종들이 혼합되어 산출되는 것은, 퇴적물의 퇴적 당시 고환경이 주로 남극 순환수에 의해 운반된 남극저층수(Circumpolar deep water)에 의해 영향을 받아서 주변의 고기 퇴적물로부터 규조 화석들이 재이동 되었음을 의미한다.

Keywords

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