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Diatom research from the Drake Passage Core Sediment (GC05-DP02), Antarctica

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Diatom research from the Drake Passage Core Sediment (GC05-DP02), Antarctica
Other Titles
남극 드레이크 해협 코어 퇴적물(GC05-DP02)에서 규조 연구
Yoon, Ho Il
Bak, Young-Suk
Lee, Jae Il
Lee, Jong-Deock
Drake Passage; diatom; interglacial; glacial; Hemidiscus karstenii
Issue Date
Yoon, Ho Il, et al. 2010. "Diatom research from the Drake Passage Core Sediment (GC05-DP02), Antarctica". The Geological Society Of Korea, 46(6): 553-560.
Diatom samples have been extracted from core sediment GC05-DP02 in Drake Passage, Antarctica. High number of diatom valves per gram of dry sediment was observed in core, ranging from 0.2 to 2.8 ×106/g. The open ocean diatoms from the core are dominated by Fragilariopsis kerguelensis and Thalassiosira lentiginosa which are about 69.8% of the total. We believe that there is little effect by the sea-ice even in the glacial periods, because high abundance of these Southern Ocean endemic taxa indicates sea-ice free waters. Diatom valve abundance and open ocean species are scarce in Unit B, D, F and H, identified as glacial periods (magnetic susceptibility: high). On the contrary, The Unit A, C, E, G and I shows high valve concentration and increasing open ocean species, identified as interglacial periods (magnetic susceptibility: low). The distribution pattern of Hemidiscus karstenii (FAO: 0.42 Ma (MIS 11), LAO: 0.19 Ma (MIS 7)) indicates interglacial periods during Marine Isotope Stages 7 and 9 in the Unit E and G, GC05-DP02.
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