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Geochemical Signatures of Paleoclimate Changes in the Sediment Cores from the Gloria and Snorri Drifts (Northwest Atlantic) over the Holocene-Mid Pleistocene

Shirshov Institute of Oceanology, Russian Academy of Sciences (RAS), 117997 Moscow, Russia
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Geosciences 2019, 9(10), 432; https://doi.org/10.3390/geosciences9100432
Received: 22 August 2019 / Revised: 20 September 2019 / Accepted: 3 October 2019 / Published: 5 October 2019
A multiproxy study of the sediment cores taken from the Snorri Drift, formed under the influence of the Iceland–Scotland bottom contour current, and from the Gloria Drift, located southward Greenland at the boundary of Irminger and Labrador Seas, was performed. This area undergoes a variable mixing of polar waters with the warm North Atlantic current, whose intensity and direction seemed to change dramatically with the alteration of warming and cooling periods during the six marine isotope stages MIS 1-6. The relative age of this core does not exceed 190,000 cal yr BP; the average sedimentation rate was 1.94 and 2.45 cm/kyr in the Gloria and Snorri Drifts core respectively. In both the cores, the sediment records showed the downcore co-variation of ice-rafted debris (IRD); and terrigenous elements, such as Si, Al, Ti, Cr, and Zr, were revealed; their values were clearly higher in the glacial periods (MIS 2, 4, and 6) compared to interglacials (MIS 1, 3, and 5). The downcore rhythmic distributions of these elements, as well as Al/Si, Ti/Al, Fe/Al ratios exhibit an opposite trend with that of δ18O values, biogenic components (CaCO3, BioSiO2), and Si/Fe and Mn/Fe ratios. View Full-Text
Keywords: geochemical indicators; paleoclimate change; sediment core; Gloria and Snorri contourite drifts; XRF analysis geochemical indicators; paleoclimate change; sediment core; Gloria and Snorri contourite drifts; XRF analysis
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Demina, L.L.; Novichkova, E.A.; Lisitzin, A.P.; Kozina, N.V. Geochemical Signatures of Paleoclimate Changes in the Sediment Cores from the Gloria and Snorri Drifts (Northwest Atlantic) over the Holocene-Mid Pleistocene. Geosciences 2019, 9, 432.

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