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Pilgrimstad revisited – multi-proxy reconstructions of Early/Middle Weichselian climate and environment at a key site in central Sweden
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Geological Sciences.
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2010 (English)In: Boreas, Vol. 40, 211-230 p.Article in journal (Refereed) Published
Abstract [en]

The site Pilgrimstad in central Sweden has often been cited as a key locality for discussions of ice-free/ice-covered intervals during the Early and Middle Weichselian. Multi-proxy investigations of a recently excavated section at Pilgrimstad now provide a revised picture of the climatic and environmental development between similar to 80 and 36 ka ago. The combination of sedimentology, geochemistry, OSL and 14C dating, and macrofossil, siliceous microfossil and chironomid analyses shows: (i) a lower succession of glaciofluvial/fluvial, lacustrine and glaciolacustrine sediments; (ii) an upper lacustrine sediment sequence; and (iii) Last Glacial Maximum till cover. Microfossils in the upper lacustrine sediments are initially characteristic for oligo- to mesotrophic lakes, and macrofossils indicate arctic/sub-arctic environments and mean July temperatures > 8 degrees C. These conditions were, however, followed by a return to a low-nutrient lake and a cold and dry climate. The sequence contains several hiatuses, as shown by the often sharp contacts between individual units, which suggests that ice-free intervals alternated with possible ice advances during certain parts of the Early and Middle Weichselian.

Place, publisher, year, edition, pages
2010. Vol. 40, 211-230 p.
National Category
Physical Geography Geosciences, Multidisciplinary
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URN: urn:nbn:se:su:diva-67071DOI: 10.1111/j.1502-3885.2010.00192.xISI: 000288759400001OAI: oai:DiVA.org:su-67071DiVA: diva2:469455
Note
authorCount :8Available from: 2011-12-23 Created: 2011-12-23 Last updated: 2012-01-04Bibliographically approved

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Wohlfarth, BarbaraLundqvist, Jan
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