Middle Pleistocene-Holocene calcareous plankton and benthos biostratigraphy of the Markova Depression,equatorial atlantic |
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| Authors: | L A Golovina M E Bylinskaya Yu V Vernigorova |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;(2) Institute of Geological Sciences, National Academy of Sciences of Ukraine, Olesya Gonchara ul., 55b, Kiev, 01054, Ukraine |
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| Abstract: | The analysis of nannoplankton, planktonic and benthic foraminifer assemblages provided detailed biostratigraphic characteristics of the upper part of sedimentary cover in the Markova Depression, rift valley of the Mid-Atlantic Ridge. The Gephyrocapsa oceanica and Emiliania huxleyi nannofossil zones, (LO) Helicosphaera inversa biohorizon, Emiliania huxleyi Acme Zone, and planktonic foraminiferal Globigerina calida calida, Globigerina bermudezi and Globorotalia fimbriata subzones were recognized. The compiled paleotemperature curve is correlated with the upper 10 oxygen isotope stages. The recovered deposits were accumulated during 400 ka. Changes in abundance and species composition of benthic foraminifer assemblages are suggested to be correlative with hydrothermal activity outbreaks in the rift zone. |
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| Keywords: | Pleistocene Quaternary nannoplankton planktonic foraminifers benthic foraminifers equatorial Atlantic biostratigraphy paleotemperatures |
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