Paleocurrents in the Charlie-Gibbs Fracture Zone during the Late Quaternary
- Authors: Bashirova L.D.1,2, Dorokhova E.V.1, Sivkov V.V.1, Andersen N.3, Kuleshova L.A.1, Matul A.G.4
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Affiliations:
- Atlantic Branch, Shirshov Institute of Oceanology
- Immanuel Kant Baltic Federal University
- Kiel University
- Shirshov Institute of Oceanology
- Issue: Vol 57, No 3 (2017)
- Pages: 444-454
- Section: Marine Geology
- URL: https://journal-vniispk.ru/0001-4370/article/view/149462
- DOI: https://doi.org/10.1134/S0001437017020035
- ID: 149462
Cite item
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.
About the authors
L. D. Bashirova
Atlantic Branch, Shirshov Institute of Oceanology; Immanuel Kant Baltic Federal University
Author for correspondence.
Email: bas_leila@mail.ru
Russian Federation, Kaliningrad; Kaliningrad
E. V. Dorokhova
Atlantic Branch, Shirshov Institute of Oceanology
Email: bas_leila@mail.ru
Russian Federation, Kaliningrad
V. V. Sivkov
Atlantic Branch, Shirshov Institute of Oceanology
Email: bas_leila@mail.ru
Russian Federation, Kaliningrad
N. Andersen
Kiel University
Email: bas_leila@mail.ru
Germany, Kiel
L. A. Kuleshova
Atlantic Branch, Shirshov Institute of Oceanology
Email: bas_leila@mail.ru
Russian Federation, Kaliningrad
A. G. Matul
Shirshov Institute of Oceanology
Email: bas_leila@mail.ru
Russian Federation, Kaliningrad
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