Correlation of Swedish glacial varves with the Greenland (GRIP) oxygen isotope record
1999 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 14, no 4, 361-371 p.Article in journal (Refereed) Published
A mean varve thickness curve has been constructed for a part of the Swedish varve chronology from the northwestern Baltic proper. The mean varve thickness curve has been correlated with the delta(18)O record from the GRIP ice-core using the Younger Dryas-Preboreal climate shift. This climate shift was defined by pollen analyses. The Scandinavian ice-sheet responded to a warming at the end of the Younger Dryas, ca. 10 995 to 10 700 clay-varve yr BP. Warming is recorded as a sequence of increasing mean varve thickness and ice-rafted debris suggesting intense calving of the ice front. The Younger Dryas-Preboreal climatic shift is dated to ca. 10 650 clay-varve yr BP, about 40 yr after the final drainage of the Baltic Ice Lake. Both the pollen spectra and a drastic increase in varve thickness reflect this climatic shift. A climate deterioration, correlated with the Preboreal oscillation, is dated to ca. 10 440 to 10 320 clay-varve yr BP and coincides with the brackish water phase of the Yoldia Sea stage. The ages of the climatic oscillations at the Younger Dryas-Preboreal transition show an 875 yr discrepancy compared with the GRIP record, suggesting a large error in the Swedish varve chronology in the part younger than ca. 10 300 clay-varve yr BP.
Place, publisher, year, edition, pages
1999. Vol. 14, no 4, 361-371 p.
Sweden, Baltic proper, clay-varve chronology, pollen analysis, GRIP ice-core, Younger Dryas, Preboreal oscillation
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:sh:diva-5976DOI: 10.1002/(SICI)1099-1417(199907)14:4<361::AID-JQS446>3.0.CO;2-ROAI: oai:DiVA.org:sh-5976DiVA: diva2:394776