Diatom Succession Representing the Paleoclimatic Change from Laminated Sediments around Antarctica
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- Diatom Succession Representing the Paleoclimatic Change from Laminated Sediments around Antarctica
- Bak, Young-Suk
Yoon, Ho Il
- Environmental Sciences & Ecology
- Diatom; Bransfield Strait; Biogenic diatom laminae; Terrigenous laminae; Cold events
- Issue Date
- Bak, Young-Suk., et al. 2015. Diatom Succession Representing the Paleoclimatic Change from Laminated Sediments around Antarctica. Journal of Earch Science Society, 36(2): 190-197.
- This study investigated the paleoclimatic change using diatoms that were extracted from the high-resolution laminated layers of diatom ooze sediment cores GC08-EB01 in the eastern basin of the Bransfield Strait, Antarctica. The
range of diatom valves per gram of dry sediment was from 0.4 to 4.2×108 g--1 in quantitative diatom assemblage analysis. Laminations are classified using visually dominant diatom species and terrigenous content. Biogenic diatom ooze laminae characterised by bloom of Corethron crilophilum, Eucampia antarctica, Fragilariopsis curta, F. kerguelensis, Odontella weissflogii, Proboscia inermis, R. styliformis, Thalassiosira antarctica, and Chaetoceros resting spores. Terrigenous laminae characterised by mixed diatom assemblage. The ratio of (Fragilariopsis curta+F. cylindrus)/Thalassiosira antarctica increase in horizons, suggesting increased sea-ice cover in the study area during the late Holocene (cold events). As a result, five cold events are identified on the basis of frequency of the critical taxa throughout the section.
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