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http://dx.doi.org/10.9727/jmsk.2019.32.3.173

Sediment Provenance using Clay Mineral in the Continental Shelf and Rise of the Eastern Bellingshausen Sea, Antarctica  

Park, Young Kyu (Department of Earth System Sciences, Yonsei University)
Jung, Jaewoo (Department of Earth System Sciences, Yonsei University)
Lee, Kee-Hwan (Department of Earth System Sciences, Yonsei University)
Lee, Minkyung (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Kim, Sunghan (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Yoo, Kyu-Cheul (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Lee, Jaeil (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Kim, Jinwook (Department of Earth System Sciences, Yonsei University)
Publication Information
Journal of the Mineralogical Society of Korea / v.32, no.3, 2019 , pp. 173-184 More about this Journal
Abstract
Variations in grain size distribution and clay mineral assemblage are closely related to the sedimentary facies that reflect depositional conditions during the glacial and interglacial periods. Gravity cores BS17-GC15 and BS17-GC04 were collected from the continental shelf and rise in the eastern Bellingshausen Sea during a cruise of the ANA07D Cruise Expedition by the Korea Polar Research Institute in 2017. Core sediments in BS17-GC15 consisted of subglacial diamicton, gravelly muddy sand, and bioturbated diatom-bearing mud from the bottom to the top sediments. Core sediments in BS17-GC04 comprised silty mud with turbidites, brownish structureless mud, laminated mud, and brownish silty bioturbated diatom-bearing mud from the bottom to the top sediments. The clay mineral assemblages in the two core sediments mainly consisted of smectite, chlorite, illite, and kaolinite. The clay mineral contents in core GC15 showed a variation in illite from 28.4 % to 44.5 % in down-core changes. Smectite contents varied from 31.1 % in the glacial period to 20 % in the deglacial period and 25.1 % in the interglacial period. Chlorite and kaolinite contents decreased from 40.5 % in the glacial period to 30.3 % in the interglacial period. The high contents of illite and chlorite indicated a terrigenous detritus supply from the bedrocks of the Antarctic Peninsula. Core GC04 from the continental rise showed a decrease in the average smectite content from 47.2 % in the glacial period to 20.6 % in the interglacial period, while the illite contents increased from the 21.3 % to 43.2 % from the glacial to the interglacial period. The high smectite contents in core GC04 during the glacial period may be supplied from Peter I Island, which has a known smectite-rich sediment contributed by Antarctic Circumpolar Currents. Conversely, the decrease in smectite and increase in chlorite and illite contents during the interglacial period was likely caused by a higher supply of chlorite- and illite-enriched sediment from the eastern Bellingshausen Sea shelf by the southwestward flowing contour current.
Keywords
Clay mineral assemblage; eastern Bellingshausen Sea; glacial period; interglacial period; continental rise;
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