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http://dx.doi.org/10.4217/OPR.2020.42.3.249

Characteristics and Paleoceanographic Implications of Grain-size Distributions of Biogenic Components in Sediments from the South Korea Plateau (East Sea)  

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)
Publication Information
Ocean and Polar Research / v.42, no.3, 2020 , pp. 249-261 More about this Journal
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.
Keywords
grain-size distribution; grain composition; paleoceanography; South Korea Plateau; East Sea;
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