Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Radiolarians from Core Sediments (A9-EB2) in Bransfield Basin, West Antarctica

서남극 브랜스필드 동부 분지내 코아 퇴적물(A9-EB2)의 방산충

  • Bak, Young-Suk (Department of Earth & Environmental Sciences, Chonbuk National University) ;
  • Lee, Jong-Deock (Department of Earth & Environmental Sciences, Chonbuk National University) ;
  • Yun, Hye-Su (Department of Geology, Chungnom National University) ;
  • Yoon, Ho-Il (Polor Research Center, Korea Oceon Research ond Development Institute) ;
  • Kim, Hyang-Sook (Department of Earth & Environmental Sciences, Chonbuk National University)
  • 박영숙 (전북대학교 지구환경과학과) ;
  • 이종덕 (전북대학교 지구환경과학과) ;
  • 윤혜수 (충남대학교 지질학과) ;
  • 윤호일 (한국해양연구원 극지연구센터) ;
  • 김향숙 (전북대학교 지구환경과학과)
  • Published : 2001.04.30
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Abstract

A total of 58 species of radiolarians belonging to 41 genera were identified in 44 samples from core A9-EB2 of the Bransfield Basin in the Antarctic. The radiolarian assemblages from A9-EB2 are generally very low in abundance.The dominant species are Antarctissa denticulata, A. longa, A. strelkovi, Lithomelissa setosa, Lifhomitra lineata, Peridium longispinum and Phormacantha hystrix, constituting 75% of the total assemblage. Genera Challenge개n and Protocystis belonging to family Challeneriidae, found in core A9-EB2 have been recorded in the Quaternary sediments. Therefore, the geologic age of core A9-EB2 in Bransfield Basin is regarded to be Quternary (Pleistocene-Holocene). Typical circumpolar taxa such as Antarctissa strelkovi, A. denticulata, Cycladophora davisiana and Larcopyle buetschlii are representing the influence of waters from Bellingshausen Sea and Antarctic Circumpolar Current. Plectacantha oikiskos and Phomacantha hystrix are considered as a coastal indicator. Also, low amounts of Lithomelissa setosa are related to pelagic condition and entrance of cold waters from the Western Weddell Sea into Bransfield Basin. Therefore, the core sediments in Bransfield Basin were deposited under the coastal condition mainly influenced by the waters from Bellingshausen Sea and Antarctic Circumpolar Current. but also by the water from the Western Weddell Sea of the open-water condition.

브랜스필드 동부 분지에서 얻은 길이 약 5m의 시추코어(A9-EB2)에서 채취된 44개의 시료로부터 총 41속 58종의 방산충이 감정되었으며, Antarctissa denticulata, A. longa, A. strelkovi, Lithomelissa setosa, Lithomitra lineata, Peridium longispinum와 Phormacantha hystrix 등이 우세종으로 이들이 총 산출량의 75%를 차지한다 시추코어에서 산출된 방산충 군집의 대부분은 긴 지질 시대를 나타내는 종들이며, Phaeodarian목의 Challengeriidae과에 속하는 Challengeron 속과 P개tocystis 속은 일반적으로 제4기에서 산출되므로 시추 퇴적물의 대략적인 지질 시대는 제4기(Pleistocene-Holocene)에 해당된다. 방산충 군집의 종조성은 Antarctissa strelkovi, A. denticulata, Cycladophora davisiana와 Larcopyle buetschlii등 전형적인 남극종(Circumpolar group)들이 다른 종들에 비해 상대적으로 다량 산출된다. 또한 연안 환경을 지시하는 Plectacantha oikiskos, Phomacantha hystrix와 원양 환경을 지시하는 Lithomelissa setosa가 함께 산출된다. 남극종의 산출과 Phomacantha-Plectacantha group이 Lithomelissa group의 산출량보다 많은 것으로 보아, 연구 지역은 남극순환수(Antarctic Circumpolar Current)나 벨링스하우젠해로부터 해류의 영향을 받은 연안 환경 지역이나 서쪽의 원양 환경인 웨델해로부터 브랜스필드 분지로 차가운 물이 유입되었음을 알 수 있다.

Keywords

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