A late Weichselian stable isotope and Molluscan Stratigraphy from Southern Sweden

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Abstract
Late Weichselian and early Holocene partly carbonate‐rich sediments from a small lacustrine deposit in Skâné, southern Sweden, were analysed for stable carbon and oxygen isotopes and mollusc assemblages. The data from these analyses reveal a pronounced climatic wanning at c. 12,400 BP, accompanied by a general change from continental to maritime conditions. Two significant climatic oscillations were identified, dated ate. 12,200–12,000 BP ande. 11,000–10,200 BP. The climatic cooling of the latter, corresponding to the Younger Dryas stadial, may have been initiated well before 11,000 BP. A climatic oscillation of minor amplitude may have occurred around 11,500 BP. Distinct variations in 513C of bulk organic material and shell carbonate are discussed in terms of climatically‐induced changes in lake‐water chemistry. The general assumption of a positive correlation between 8I8O of limnic carbonates and mean annual air temperature is questioned. A climatic warming may be associated with a depletion of 18O in limnic carbonates. Comparisons of palaeoclimatic information from the stable isotope data with that provided by molluscs allow the identification of aspects of climatic and environmental change such as water temperature, water depth, and aquatic vegetation density. Changes in the mollusc assemblage reflect changes in the limnic environment and facilitates the interpretation of stable isotope data. Hammarlund, D. & Keen, D.H., 1994: A Late Weichselian stable isotope and molluscan stratigraphy from southern Sweden. GFF, Vol. 116 (Pt. 4, December), pp. 235–248. Stockholm. ISSN 1103–5897.