Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Characteristics and Paleoceanographic Implications of Grain-size Distributions of Biogenic Components in Sediments from the South Korea Plateau (East Sea)

동해 남한국대지 퇴적물의 생물기원 성분 입도 분포의 특성과 고해양학적 의미

  • Jang, Jun-Ho (Department of Marine Environment Science, College of Natural Sciences, Chungnam National University) ;
  • Bahk, Jang-Jun (Department of Marine Environment Science, College of Natural Sciences, Chungnam National University) ;
  • Kim, Eun-Jung (Department of Marine Environment Science, College of Natural Sciences, Chungnam National University) ;
  • Um, In-Kwon (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 장준호 (충남대학교 자연과학대학 해양환경과학과) ;
  • 박장준 (충남대학교 자연과학대학 해양환경과학과) ;
  • 김은정 (충남대학교 자연과학대학 해양환경과학과) ;
  • 엄인권 (한국지질자원연구원 석유해저연구본부)
  • Received : 2020.04.08
  • Accepted : 2020.06.16
  • Published : 2020.09.30
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Abstract

This study details grain-size distributions (GSDs) of carbonate and biogenic opal fractions of the sediments retrieved from the South Korea Plateau in the East Sea and draws paleocanographic implications from them. The opal-fraction GSDs show fine modes of 10.3 ㎛ and coarse modes of 102.5 ㎛ on average. The fine-mode grains of opal fractions mainly consist of small diatoms and radiolarians including their broken frustules, while the coarse-mode grains are mostly comprised of large warm-water diatoms and radiolarians. Significant positive correlation between opal contents and abundances of the coarse-mode GSDs in the total GSDs suggests that the abundances of the coarse-mode GSDs were controlled by the increased surface productivity of warm-water diatoms during interglacial stages. The carbonate-fraction GSDs show fine modes of 2.4 ㎛ and coarse modes of 99.1 ㎛ on average. The fine-mode grains mainly consist of coccolithophores, while the coarse-mode grains are mostly comprised of intact or broken planktonic foraminifera. The abundances of coarse-mode and fine-mode GSDs were not correlated with carbonate contents, suggesting a complex control exerted by both the degree of carbonate dissolution and the productivity of coccolithophores on the carbonate-fraction GSDs.

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