Submarine push moraine formation during the early Fennoscandian Ice Sheet deglaciation

Abstract The glacial history in the topographically confined paleo-ice stream drainage route of Vestfjorden, North Norway, was analysed based on bathymetric data, high-resolution seismology and 14 C AMS-dated gravity cores. The inner part of the fjord is characterised by axial-parallel mega-scale li...

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Bibliographic Details
Published in:Quaternary Research
Main Authors: Laberg, J.S., Eilertsen, R.S., Salomonsen, G.R., Vorren, T.O.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2007
Subjects:
General Earth and Planetary Sciences
Earth-Surface Processes
Arts and Humanities (miscellaneous)
Norway
Røst
Værøy
Fennoscandian
Ice Sheet
North Norway
Vestfjorden
Online Access:http://dx.doi.org/10.1016/j.yqres.2007.01.014
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Summary:Abstract The glacial history in the topographically confined paleo-ice stream drainage route of Vestfjorden, North Norway, was analysed based on bathymetric data, high-resolution seismology and 14 C AMS-dated gravity cores. The inner part of the fjord is characterised by axial-parallel mega-scale lineations whereas the outer part is dominated by two marginal morainal bank systems. The Værøy (inner) and Røst (outer) marginal moraine systems comprise several transverse, zigzag-shaped ridges. Seismic records show thrusted and folded sediment blocks within the ridges. The landforms are inferred to reflect basal processes and the transition from warm-based (inner fjord) to cold-based (outer fjord) conditions, i.e. fast flow followed by basal freeze-on, sediment deformation and morainal bank formation. The moraines formed during the final part of two paleo-ice sheet re-advances. 14 C AMS dating indicates a maximum age of 13.7 14 C ka BP (16.2 cal ka BP) for the Røst system whereas the Værøy system is inferred to be slightly older than 12.5 14 C ka BP (14.5 cal ka BP). This demonstrates that the northern part of the Fennoscandian Ice Sheet behaved in a much more dynamic way during the early deglaciation than previously assumed.

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