Stratigraphic evidence for a high marine shore-line during the late Weichselian deglaciation on the Kullen Peninsula, southern Sweden
✍ Scribed by Per Sandgren; Ian F. Snowball; Dan Hammarlund; Jan Risberg
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 350 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0267-8179
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✦ Synopsis
Mineral magnetic properties and the carbon content of a sediment sequence in Lake Kullatorpssjo ¨n on the Kullen Peninsula in northwest Scania, southern Sweden, were investigated. Diatom and ostracod analyses were undertaken for palaeoecological reconstruction and a chronology was constructed from accelerator mass spectrometry (AMS) radiocarbon dating of terrestrial plant remains and mosses. Five stratigraphical units were identified (units 1-5, from oldest to youngest). The two lowermost units consist of clay. The lowest clay unit (1) is strikingly black, 2 m thick and has magnetic properties dominated by high concentrations of authigenic greigite (Fe 3 S 4 ). In contrast, the overlying clay unit (2) is grey, 1.18 m thick and has magnetic properties dominated by low concentrations of detrital magnetite (Fe 3 O 4 ). A major palaeoecological change is reflected in the diatom flora and ostracod fauna at the transition from unit 1 to unit 2. The sediment stratigraphy, geochemical, mineral magnetic and palaeoecological analyses also point to a significant change in depositional environment at this transition, which is proposed to represent the isolation of Lake Kullatorpssjo ¨n from the Kattegat Sea. Earlier investigations have determined the marine limit to ca. 65 m a.s.1. on the Kullen Peninsula. The separate independent lines of evidence presented here, however, suggest that the Late Weichselian marine limit developed at 85-90 m a.s.l. at the deglaciation ca. 17 200 cal. yr BP (ca. 14 500 yr BP). This limit is ca. 25 m higher than assumed previously. Lake Kullatorpssjo ¨n formed ca. 1000 cal. yr later when the basin became isolated from the Kattegat Sea.