Quaternary palynostratigraphy of the Pechora Sea.

Rudenko, O. V. and Polyakova, Yelena I. (2005) Quaternary palynostratigraphy of the Pechora Sea. In: Pechora Sea environments : Past, Present, and Future. , ed. by Bauch, Henning A., Pavlidis, Yu. A., Polyakova, Yelena I., Matishov, G. G. and Koç, N.. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 501 . Kamloth, Bremen, pp. 155-166, 247 pp.

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Abstract

By combining the lithologic, original palynologic and published micropaleonthological data we reconstructed paleogeographical events On the Pechora shelf during the Younger Dryas and Holocene time. Our paleoenvironmental reconstructions are based On the regularities in formation of pollen-and-spores assemblages in the surface sediments of the Pechora Sea. The main stages in paleogeography of the Pechora Sea during the Late Pleistocene were emphasized. The Late Valdai sediments in the Pechora Sea region were accumulated under the influence of fluvioglacial flows probably from the melting ice cap on Kolguev Island and, also, coastal glaciers. Climate deterioration considerably changed coastal vegetation as reflected in the depleted taxonomic and quantitative composition of palynospectra. The pollen data suggest that Open steppe-like plant communities with Artemisia, Poaceae, Asteraceae and Caryophyllaceae dominated dry ecotopes On watersheds, whereas tundra-like communities with Betula nana, arctic Salix, Dryas, Saxifraga, Carex and Brassicaceae were common in more humid coastal lowlands.
The overlying silts and loamy sands are believed to have been accumulated during early deglaciation, i.e., Older Dryas and Alleröd. During this phase the glacial sedimentation was rather rapidly replaced by a glaciomarine deposition. Progressive climate warming caused prominent changes in coastal vegetation. Discontinuous treeless tundra-steppe associations were replaced by dwarf and shrub ernik tundra. A "complex vegetation cover" of forest-tundra apparently existed in the northern part of the Kola Peninsula and in the Northern Dvina Lowland. By the end of the Alleröd alder-bushes and horsetails occupied riverbanks, and spruce occurred in the forest-tundra communities on the adjacent hinterland.

Document Type: Book chapter
Keywords: Quaternary; Pechora Sea; Palynostratigraphy
Refereed: No
Open Access Journal?: Yes
ISSN: 1618-3193
Related URLs:
Projects: Laptev Sea System, Permafrost
Date Deposited: 17 Mar 2015 10:34
Last Modified: 30 Mar 2015 09:28
URI: http://oceanrep.geomar.de/id/eprint/28052

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