Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

Landscape imprints of changing glacial regimes during ice-sheet build-up and decay: a conceptual model from Svalbard

Författare

  • Jon Y. Landvik
  • Helena Alexanderson
  • Mona Henriksen
  • Olafur Ingolfsson

Summary, in English

The behaviour of ice sheets and their geologic imprints in fjord regions are often multifaceted. Fjords, which were temporarily occupied by fast flowing ice-streams during major glaciations, and inter-fjord areas, which were covered by less active ice, show different signatures of past glaciations. The land and marine records of glaciations over the western Svalbard fjord region have been extensively studied during the last few decades. We have re-examined ice-flow records from stratigraphic and geomorphic settings, and propose a succession of ice-flow events that occurred repeatedly over glacial cycles: the maximum, the transitional, and the local flow style. The differently topographically constrained segments of the ice-sheet switched behaviour as glacial dynamics developed through each glacial cycle. These segments, as well as the different flow styles, are reflected differently in the offshore stratigraphic record. We propose that the glacial geomorphological signatures in the inter ice-stream areas mostly developed under warm-based conditions during a late phase of the glaciations, and that the overall glacial imprints in the landscape are strongly biased towards the youngest events. (C) 2013 Elsevier Ltd. All rights reserved.

Ämne

  • Geology

Nyckelord

  • Svalbard
  • Ice flow
  • Glacial regime
  • Landscape imprints

Status

Published

Projekt

  • Glacial history of Svalbard

ISBN/ISSN/Övrigt

  • ISSN: 0277-3791