A short-lived aeolian event during the Early Holocene in southeastern Norway |
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| Institution: | 1. Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;2. Department of Environmental Sciences, Norwegian University of Life Sciences, PO Box 5003, NO-1432 Ås, Norway;1. Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;2. Geological Museum, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen, Denmark |
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| Abstract: | The Starmoen dune field is part of a larger aeolian system in the Jømna and Glomma river valleys in southeastern Norway. It is believed to have formed just after the last deglaciation in the area, but no absolute ages have been available to support this. Here, we present a set of quartz optically stimulated luminescence (OSL) ages from the aeolian sediments and the underlying glacifluvial deposits. The results show that the main dune-building phase was a short-lived event ～10 ka ago, likely with a duration less than a few hundred years. This suggests a rapid stabilisation of an initially unstable environment in newly deglaciated terrain. A much younger event with limited and surficial reworking of sand is dated to 770 ± 110 years ago, and the modern age of an active dune provide additional OSL quality control. Age overestimation is found for glacifluvial sediments, probably due to incomplete bleaching as indicated by e.g. scattered dose distributions from small aliquots. OSL measurements were conducted using coarse quartz grains (180–250 m), which show a dominance of a fast signal component. |
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| Keywords: | OSL Eolian Inland dune Holocene Norway |
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