Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Estimation of Sediment Provenance Using Clay Mineral Composition in the Central Basin of the Ross Sea Continental Margin, Antarctica

남극 로스해 대륙주변부 중앙분지의 점토광물 조성을 통한 기원 추적

  • Ha, Sangbeom (Department of Oceanography, College of Natural Sciences, Pusan National University) ;
  • Khim, Boo-Keun (Department of Oceanography, College of Natural Sciences, Pusan National University) ;
  • Colizza, Ester (Department of Mathematics and Geosciences, College of Technology and Science, University of Trieste) ;
  • Giglio, Federico (National Research Council-Institute of Polar Science) ;
  • Koo, Hyojin (Department of Geology, College of Natural Sciences, Gyeongsang National University) ;
  • Cho, Hyen Goo (Department of Geology, College of Natural Sciences, Gyeongsang National University)
  • 하상범 (부산대학교 자연과학대학 해양학과) ;
  • 김부근 (부산대학교 자연과학대학 해양학과) ;
  • ;
  • ;
  • 구효진 (경상대학교 자연과학대학 지질과학과) ;
  • 조현구 (경상대학교 자연과학대학 지질과학과)
  • Received : 2019.08.09
  • Accepted : 2019.10.04
  • Published : 2019.12.30
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Abstract

To trace the provenance of fine-grained sediments in response to the growth and retreat of glaciers (i.e., Ross Ice Sheet) that affects the depositional process, various kinds of analyses including magnetic susceptibility, granulometry, and clay mineral composition with AMS 14C age dating were carried out using a gravity core KI-13-GC2 obtained from the Central Basin of the Ross Sea continental margin. The sediments mostly consist of silty mud to sand with ice-rafted debris, the sediment colors alternate repeatedly between light brown and gray, and the sedimentary structures are almost bioturbated with some faint laminations. Among the fine-grained clay mineral compositions, illite is highest (59.1-76.2%), followed by chlorite (12.4-21.4%), kaolinite (4.1-11.6%), and smectite (1.2-22.6%). Illite and chlorite originated from the Transantarctic mountains (metamorphic rocks and granitic rocks) situated to the south of the Ross Sea. Kaolinite might be supplied from the sedimentary rocks of Antarctic continent underneath the ice sheet. The provenance of smectite was considered as McMurdo volcanic group around the Victoria Land in the western part of the Ross Sea. Chlorite content was higher and smectite content was lower during the glacial periods, although illite and kaolinite contents are almost consistent between the glacial and interglacial periods. The glacial increase of chlorite content may be due to more supply of the reworked continental shelf sediments deposited during the interglacial periods to the Central Basin. On the contrary, the glacial decrease of smectite content may be attributed to less transport from the McMurdo volcanic group to the Central Basin due to the advanced ice sheet. Although the source areas of the clay minerals in the Central Basin have not changed significantly between the interglacial and glacial periods, the transport pathways and delivery mechanism of the clay minerals were different between the glacial and interglacial periods in response to the growth and retreat of Ross Ice Sheet in the Ross Sea.

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References

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