IRSL from fine-grained glacifluvial sediment

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Abstract

Samples of suspended sediment were obtained from the Dora di Ferret, a glacifluvial stream in the Italian Alps, over a period of 24 h. IRSL analysis of the sediment indicates that the residual (I-NAT) signal is almost completely zeroed within 3 km of fluvial transport during daylight hours. In contrast, samples collected at night possess environmental doses (D-E) in excess of 100 Gy, probably the luminescence signal of the parent till from which the fine-grained suspended load has been derived. Quaternary deposits of glacifluvial sediment will contain a mixture of daylight and night transported mineral grains, the resulting complex behaviour accounting for difficulties in luminescence dating such materials. Adaptations of single-aliquot protocols and single-grain protocols appear to offer the best chance of dating glacifluvial deposits accurately. (C) 1999 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)207-215
Number of pages9
JournalQuaternary Science Reviews
Volume18
Publication statusPublished - 1999

Keywords

  • QUATERNARY SEDIMENTS
  • BLEACHED SEDIMENTS
  • SINGLE ALIQUOTS
  • LUMINESCENCE
  • THERMOLUMINESCENCE
  • SPITSBERGEN
  • CHRONOLOGY
  • FELDSPARS
  • SCOTLAND

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