Clay mineralogical characteristics of sediments deposited during the late quaternary in the larsen ice shelf B embayment, Antarctica

Jaewoo Jung, Kyu Cheul Yoo, Kee Hwan Lee, Young Kyu Park, Jae Il Lee, Jin-Wook Kim

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2 Citations (Scopus)

Abstract

Variations in grain size, clay mineral composition, and stable isotopes (δ 13 C and δ 15 N) are closely linked to the sedimentary facies that reflect mineralogical and geochemical modification during the retreat and advance of the Larsen ice shelf. A whole round core of marine sediment (EAP13-GC17, 236 cm below the sea floor) was collected on the northwestern Larsen B embayment of the Antarctic Peninsula during a marine geological expedition (the ARA13 Cruise Expedition by the Korea Polar Research Institute, 2013). Four sedimentary facies (U1–U4) were clearly distinguishable: bioturbated sandy mud (open marine, U1), laminated sandy mud (sub–floating ice shelf, U2), sandy clay aggregates (deglacial, U3), and muddy diamictons (sub-glacial, U4), as well as interbedded silty. Clay minerals, including smectite, chlorite, illite, and kaolinite, were detected throughout the core. An increase in the clay mineral ratio of smectite/(illite + chlorite) was clearly observed in the open marine condition, which was strongly indicated by both a heavier isotopic composition of δ 13 C and δ 15 N (−24.4‰ and 4.3‰, respectively), and an abrupt increase in 10 Be concentration (~30 times). An increase in the average values of the crystal packet thickness of illite (~1.5 times) in U1 also indicated sediments transported in open marine conditions. Based on the clay mineral composition in U1, the sediments are likely to have been transported from the Weddell Sea. The clay mineralogical assessments conducted in this region have significant implications for our understanding of paleodepositional environments.

Original languageEnglish
Article number153
JournalMinerals
Volume9
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

Fingerprint

ice shelf
Clay minerals
Ice
clay mineral
Sediments
Clay
illite
clay
smectite
sediment
chlorite
mud
Chemical analysis
sandy clay
diamicton
Kaolinite
marine sediment
Isotopes
kaolinite
stable isotope

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

Jung, Jaewoo ; Yoo, Kyu Cheul ; Lee, Kee Hwan ; Park, Young Kyu ; Lee, Jae Il ; Kim, Jin-Wook. / Clay mineralogical characteristics of sediments deposited during the late quaternary in the larsen ice shelf B embayment, Antarctica. In: Minerals. 2019 ; Vol. 9, No. 3.
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abstract = "Variations in grain size, clay mineral composition, and stable isotopes (δ 13 C and δ 15 N) are closely linked to the sedimentary facies that reflect mineralogical and geochemical modification during the retreat and advance of the Larsen ice shelf. A whole round core of marine sediment (EAP13-GC17, 236 cm below the sea floor) was collected on the northwestern Larsen B embayment of the Antarctic Peninsula during a marine geological expedition (the ARA13 Cruise Expedition by the Korea Polar Research Institute, 2013). Four sedimentary facies (U1–U4) were clearly distinguishable: bioturbated sandy mud (open marine, U1), laminated sandy mud (sub–floating ice shelf, U2), sandy clay aggregates (deglacial, U3), and muddy diamictons (sub-glacial, U4), as well as interbedded silty. Clay minerals, including smectite, chlorite, illite, and kaolinite, were detected throughout the core. An increase in the clay mineral ratio of smectite/(illite + chlorite) was clearly observed in the open marine condition, which was strongly indicated by both a heavier isotopic composition of δ 13 C and δ 15 N (−24.4‰ and 4.3‰, respectively), and an abrupt increase in 10 Be concentration (~30 times). An increase in the average values of the crystal packet thickness of illite (~1.5 times) in U1 also indicated sediments transported in open marine conditions. Based on the clay mineral composition in U1, the sediments are likely to have been transported from the Weddell Sea. The clay mineralogical assessments conducted in this region have significant implications for our understanding of paleodepositional environments.",
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Clay mineralogical characteristics of sediments deposited during the late quaternary in the larsen ice shelf B embayment, Antarctica. / Jung, Jaewoo; Yoo, Kyu Cheul; Lee, Kee Hwan; Park, Young Kyu; Lee, Jae Il; Kim, Jin-Wook.

In: Minerals, Vol. 9, No. 3, 153, 01.03.2019.

Research output: Contribution to journalArticle

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AB - Variations in grain size, clay mineral composition, and stable isotopes (δ 13 C and δ 15 N) are closely linked to the sedimentary facies that reflect mineralogical and geochemical modification during the retreat and advance of the Larsen ice shelf. A whole round core of marine sediment (EAP13-GC17, 236 cm below the sea floor) was collected on the northwestern Larsen B embayment of the Antarctic Peninsula during a marine geological expedition (the ARA13 Cruise Expedition by the Korea Polar Research Institute, 2013). Four sedimentary facies (U1–U4) were clearly distinguishable: bioturbated sandy mud (open marine, U1), laminated sandy mud (sub–floating ice shelf, U2), sandy clay aggregates (deglacial, U3), and muddy diamictons (sub-glacial, U4), as well as interbedded silty. Clay minerals, including smectite, chlorite, illite, and kaolinite, were detected throughout the core. An increase in the clay mineral ratio of smectite/(illite + chlorite) was clearly observed in the open marine condition, which was strongly indicated by both a heavier isotopic composition of δ 13 C and δ 15 N (−24.4‰ and 4.3‰, respectively), and an abrupt increase in 10 Be concentration (~30 times). An increase in the average values of the crystal packet thickness of illite (~1.5 times) in U1 also indicated sediments transported in open marine conditions. Based on the clay mineral composition in U1, the sediments are likely to have been transported from the Weddell Sea. The clay mineralogical assessments conducted in this region have significant implications for our understanding of paleodepositional environments.

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