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Sub-till glaciofluvial sediments at Hultsfred, South Swedish Upland
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2010 (English)In: GFF, ISSN 1103-5897, Vol. 132, no 3&4, 153-159 p.Article in journal (Refereed) Published
Abstract [en]

In a gravel pit near Hultsfred, at the eastern margin of the South Swedish Upland, gravelly, sandy and silty-sandy beds covered by a thick, strati?ed gravelly diamicton are exposed. Large folds and shear-planes indicate post-depositional deformation of the sorted sediments, which according to OSL dating have a maximum Middle Weichselian (,60 ka) age. The sand and gravel are interpreted as glacio?uvial sediments that were deposited laterally during a Middle Weichselian deglaciation, or possibly subglacially during the Late Weichselian. The large-scale deformation was due to glaciotectonics, caused by an overriding wet-based ice sheet during the last deglaciation. The subglacial hydrostatical pressure was high and led to the formation of downward-injected clastic dykes. A basal till, which forms the cover moraine in the area, caps the succession. The fairly frequent occurrence of sub-till sediments on the South Swedish Upland demonstrates the limited effect of glacial erosion in parts of this area. During the Last Glacial Maximum, the South Swedish Upland was an ‘island’ of slow-moving, polythermal and at least partly non-erosive ice, surrounded by faster ice-streams in the Baltic and in the Skagerrak. The ice sheet may have left its main impact on the landscape during short periods during advance and deglaciation only.

Place, publisher, year, edition, pages
2010. Vol. 132, no 3&4, 153-159 p.
Keyword [en]
Sweden, Smland, Weichselian, glaciofluvial, glaciotectonics
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-50710DOI: 10.1080/11035897.2010.508134ISI: 000284638100002OAI: diva2:382284
Available from: 2010-12-30 Created: 2010-12-30 Last updated: 2011-11-21Bibliographically approved

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Alexanderson, Helena
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