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http://dx.doi.org/10.9727/jmsk.2019.32.3.163

Clay Mineralogical Characteristics and Origin of Sediments Deposited during the Pleistocene in the Ross Sea, Antarctica  

Jung, Jaewoo (Department of Earth System Sciences, Yonsei University)
Park, Youngkyu (Department of Earth System Sciences, Yonsei University)
Lee, Kee-Hwan (Department of Earth System Sciences, Yonsei University)
Hong, Jongyong (Department of Earth System Sciences, Yonsei University)
Lee, Jaeil (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Yoo, Kyu-Cheul (Division of Polar Paleoenvironment, Korea Polar Research Institute)
Lee, Minkyung (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. 163-172 More about this Journal
Abstract
A long core (RS15-LC48) was collected at a site in the continental rise between the Southern Ocean and the Ross Sea (Antarctica) during the 2015 Ross Sea Expedition. The mineralogical characteristics and the origin of clay minerals in marine sediments deposited during the Quaternary in the Ross Sea were determined by analyzing sedimentary facies, variations in grain size, sand fraction, mineralogy, clay mineral composition, illite crystallinity, and illite chemical index. Core sediments consisted mostly of sandy clay, silty clay, or ice rafted debris (IRD) and were divided into four sedimentary facies (units 1-4). The variations in grain size distribution and sand content with depth were very similar to the variations in magnetic susceptibility. Various minerals such as smectite, chlorite, illite, kaolinite, quartz, and plagioclase were detected throughout the core. The average clay mineral composition was dominated by illite (52.7 %) and smectite (27.7 %), with less abundant clay minerals of chlorite (11.0 %) and kaolinite (8.6 %). The IC and illite chemical index showed strong correlation trends with depth. The increase in illite and chlorite content during the glacial period, together with the IC and chemical index values, suggest that sediments were transported from the bedrocks of the Transantarctic Mountains. During the interglacial period, smectite may have been supplied by the surface current from Victoria Land, in the western Ross Sea. High values for IC and the illite chemical index also indicate relatively warm climate conditions during that period.
Keywords
Antarctica; Ross Sea; marine sediments; clay minerals; illite crystallinity; illite chemical index;
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