Deglaciation history of the southwestern Fennoscandian Ice Sheet between 15 and 13 14C ka BP |
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| Authors: | ATLE NYGÅRD HANS PETTER SEJRUP HAFLIDI HAFLIDASON MARCELLO CECCHI DAG OTTESEN |
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| Institution: | Department of Earth Science, University of Bergen, Allegaten 41, NO-5007 Bergen, Norway;Enterprise Oil Norway, Stavanger;Geological Survey of Norway, NO-7491 Trondheim, Norway |
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| Abstract: | Analysis of 2D and 3D seismic records from the continental shelf off western Norway, in combination with chronological constraints from 14C dates, has led to a model for the glacial development in these shelf areas between c. 15 and 13 14C ka BP. On the shallow Måløy Plateau adjacent to the Norwegian Channel, iceberg scours are preserved below a prominent moraine ridge, which by correlation to the Norwegian Channel indicate ice retreat at c. 15 14C ka BP. Subsequently, the ice advanced across the scoured surface and deposited a till sheet before stabilizing to deposit a prominent moraine, termed the Bremanger Moraine. Based on location on the shelf, seismic stratigraphy, morphology and C dates the Bremanger Moraine is correlated with a significant moraine on the continental shelf off Trøndelag. We suggest that these features are products of a regional glacial event, the Bremanger Event, dated to <15–13.3 14C ka BP. The Bremanger Event is probably a result of the deteriorating climatic conditions in the NE Atlantic during Heinrich event 1. |
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