Pilgrimstad revisited - a multi-proxy reconstruction of Early/Middle Weichselian climate and environment at a key site in central Sweden

Barbara Wohlfarth, Helena Alexanderson, Linda Ampel, Ole Bennike, Stefan Engels, Timothy Johnsen, Jan Lundqvist, Paula Reimer

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

11 Citationer (Scopus)

Abstrakt

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 ∼80 and 36ka 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°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.

OriginalsprogEngelsk
Sider (fra-til)211-230
Antal sider20
TidsskriftBoreas
Vol/bind40
Udgave nummer2
DOI
StatusUdgivet - apr. 2011

Programområde

  • Programområde 5: Natur og klima

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