Pleistocene surface water temperatures in the Benguela upwelling area |
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Authors: | N S Os’kina O B Dmitrenko |
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Institution: | (1) Faculty of Geology & Geoenvironment, Department of Historical Geology-Palaeontology, University of Athens, Panepistimiopolis, 15784 Athens, Greece;(2) Institute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 712, 19013 Anavissos, Greece |
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Abstract: | Analysis of carbonate microfossils (planktonic foraminifers and nannoplankton) in the DSDP Hole 362 Quaternary section made
it possible to specify its zonal subdivision (almost all zones of Gartner’s high-resolution nannofossil scale are recognized),
establish depositional environments, and restore past surface water temperatures. The latter appeared to be several degrees
lower than their present-day values, which is evident from the anomalously high share of the subpolar species Neogloboquadrina pachyderma sin. that constitutes 97% of the fossil assemblage in Lower Pleistocene sediments. It is shown that the Benguela upwelling
existed throughout the entire Pleistocene, being less intense in the Late Pleistocene and Holocene. |
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Keywords: | |
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