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Oceanology

, Volume 57, Issue 3, pp 444–454 | Cite as

Paleocurrents in the Charlie-Gibbs Fracture Zone during the Late Quaternary

  • L. D. BashirovaEmail author
  • E. V. Dorokhova
  • V. V. Sivkov
  • N. Andersen
  • L. A. Kuleshova
  • A. G. Matul
Marine Geology
  • 68 Downloads

Abstract

Planktonic foraminiferal and ice-rafted debris count data, as well as the mean size of mineral particles of the 10–63 μm fraction (sortable silt, \(\overline {SS} \)) were used as a proxy for surface and near-bottom paleocurrent intensity variations. The data obtained support our hypothesis about turbiditic origin of the lower (80–370 cm) section of the studied AMK-4515 core. Stratigraphic subdivision of the upper section (0–80 cm) makes it possible to allocate two marine isotope stages (MIS) covering the last 27 ka. The main intervals of the North Atlantic Polar Front (PF) migrations were recorded: south of the modern PF position during early MIS 2 (24–27 ka) with PF presence in the study area during MIS 2 (20–24 ka); south of the study area during the last glacial maximum (18–20 ka). Influence of the near-bottom currents within the investigated interval led to beginning of the channel-related drift formation on the northern slope of the southern channel of the Charlie-Gibbs Fracture Zone. There is a weak relationship between intensity of near-bottom contour currents and long-term climatic cyclicity. However, intervals corresponding to Heinrich events coincide with decrease in bottom currents activity.

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • L. D. Bashirova
    • 1
    • 2
    Email author
  • E. V. Dorokhova
    • 1
  • V. V. Sivkov
    • 1
  • N. Andersen
    • 3
  • L. A. Kuleshova
    • 1
  • A. G. Matul
    • 4
  1. 1.Atlantic Branch, Shirshov Institute of OceanologyRussian Academy of SciencesKaliningradRussia
  2. 2.Immanuel Kant Baltic Federal UniversityKaliningradRussia
  3. 3.Kiel UniversityKielGermany
  4. 4.Shirshov Institute of OceanologyRussian Academy of SciencesKaliningradRussia

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