Use of environmental magnetic measurements to validate the vertical extent of ice masses at the Last Glacial Maximum

John Walden, Colin Ballantyne

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Analysis of soil samples from above and below trimlines representing the upper limit of glacial erosion at the Last Glacial Maximum demonstrates that soils with prolonged weathering histories above such trimlines yield significantly different mineral magnetic signatures from soils below trimlines. The nature of the contrast is conditioned by lithology. Basalt soils above the trimline yield significantly higher values of concentration-dependent magnetic parameters (chi, chi(arm), IRM3T, soft IRM and hard IRM) than those below the trimline, due probably to transformation of non-magnetic iron-bearing minerals into magnetic forms. Conversely, for sandstone soils most magnetic parameters yield significantly lower values for above-trimline samples, probably reflecting loss of ferrimagnetic minerals by dissolution and oxidation to aniferrimagnetic forms. These significant contrasts represent a new approach to validating high-level weathering limits as periglacial trimlines cut at the Last Glacial Maximum. Copyright (C) 2002 John Wiley Sons, Ltd.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalJournal of Quaternary Science
Volume17
Issue number3
DOIs
Publication statusPublished - Mar 2002

Keywords

  • environmental magnetism
  • periglacial trimline
  • Last Glacial Maximum
  • ice sheets
  • WESTERN NORWAY
  • NORTHWEST SCOTLAND
  • FORMER NUNATAKS
  • SHEET
  • SOILS
  • SIZE
  • RECONSTRUCTION
  • NORDFJORD

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