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Understanding processes of sediment bleaching in glacial settings using a portable OSL reader

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Georgina King, David C. W. Sanderson, Ruth Alison Joyce Robinson, Adrian Anthony Finch

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Abstract

Analysis of a high-resolution suite of modern glacial sediments from Jostedalen, southern Norway, using a portable optically stimulated luminescence (OSL) reader, provides insights into the processes of sediment bleaching in glacial environments at the catchment scale. High-magnitude, low-frequency processes result in the least effective sediment bleaching, whereas low-magnitude, high-frequency events provide greater bleaching opportunities. Changes in sediment bleaching can also be identified at the scale of individual bar features: tails of braid-bars and side-attached bar deposits have the lowest portable reader signal intensities, as well as the smallest conventional OSL residual doses. In addition to improving our understanding of the processes of sediment bleaching, portable reader investigations can also facilitate more rapid and comprehensive modern analogue investigations, which are commonly used to confirm that the OSL signals of modern glacial sediments are well bleached.
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Original languageEnglish
Pages (from-to)955-972
Number of pages18
JournalBOREAS
Volume43
Issue number4
Early online date2 May 2014
DOIs
Publication statusPublished - 2014

    Research areas

  • Glacial sediments, Optically stimulated luminescence (OSL) reader, Sediment bleaching

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