Isolation basin stratigraphy and Holocene relative sea‐level change at the Norwegian—Russian border north of Nikel, northwest Russia

Abstract

(March): Isolation basin stratigraphy andHolocene relative sea-level change at the Norwegian-Russian border north of Nikel, northwest Russia. Boreas, Vol. 28. pp. 146166. Oslo. ISSN 0300-9483. The marine-lacustrine transition (isolation contact) in sediment cores from eight lake basins situated 13.5-72 m a.s.1.. in the Nonvegian-Russian border area north of Nikel, northwest Russia, was identified based on Lithological and diatom analysis, radiocarbon dated, and used to construct a relative sea-level (RSL) curve for the Holocene. All the lakes except one (interpreted as having an unconformable slumped transition) show a regressive 1-11-111 (marine-transitional-lacustrine) facies succession, indicating a postglacial history of continuous emergence. The RSL curve shows rapid emergence between 10000 and 8000 BP, very slow emergence between 7000 ahd 5000 BP, increased rate of emergence between 4500 and 4000 BP, and a moderate rate of emergence after 3500 BP. The low rate of emergence around 6000 BP correlates with the Tapes transgression of more coastal regions, but corresponding sea level, at 25-26 ma. present s.l., lies 5-10 m lower than the elevation predicted based on existing isobase maps for the region. The discrepancy suggests a need for further work in order to more rigorously define and map the Tapes transgression and associated shoreline complex in the northern Fennoscandian-Kola region.

Reconstruction of changes in vegetation and trophic conditions of a palsa in a permafrost peatland, subarctic Québec, Canada

“…Pienitz et al, 1991;Corner et al, 1999;Smith et al, 2005). In fact, the marine-lacustrine transition (as indicated by the "isolation contact") in sediment cores from lake basins can be documented using lithostratigraphic and biostratigraphic indicators.…”

Contemporary and fossil foraminifera from isolation basins in northwest Scotland

“…1 (from Lloyd, 2000). Isolation basins have been widely used to reconstruct past sea-level changes, initially in Scandinavia (Haften and Tallantire, 1978;Kjemperud, 1981aKjemperud, ,b, 1986Karland et al, 1984;Svendsen and Mangerud, 1987;Rungren et al, 1997;Corner et al, 1999) and, more recently, in Scotland (Shennan et al, 1993(Shennan et al, , 1994(Shennan et al, , 1995(Shennan et al, , 1996a(Shennan et al, ,b, 1999 and Greenland (Long et al, 1999).…”

Late Quaternary history of northern Russia and adjacent shelves — a synopsis

“…Tapes transgression to be somewhat lower than predicted from previously published shore line diagrams (Comer et al 1999). Whether this is due to inaccuracies in dating of the shorelines or differences in glacioisostatic response in different areas has yet to be demonstrated.…”