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- Title
Paleocurrents in the Charlie-Gibbs Fracture Zone during the Late Quaternary.
- Authors
Bashirova, L.; Dorokhova, E.; Sivkov, V.; Andersen, N.; Kuleshova, L.; Matul, A.
- 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.
- Subjects
PALEOCURRENTS; PLEISTOCENE stratigraphic geology; BONE fractures; GEOPHYSICS; DATA analysis
- Publication
Oceanology (00014370), 2017, Vol 57, Issue 3, p444
- ISSN
0001-4370
- Publication type
Article
- DOI
10.1134/S0001437017020035