Determining the K-content of single-grains of feldspar for luminescence dating

R. K. Smedley*, G. A. T. Duller, N. J. G. Pearce, H. M. Roberts

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (SciVal)

Abstract

Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with similar to 12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 +/- 2% can be assumed for routine single-grain dating of density-separated K-feldspars. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)790-796
Number of pages7
JournalRadiation Measurements
Volume47
Issue number9
Early online date02 Feb 2012
DOIs
Publication statusPublished - Sept 2012
EventProceedings of the 13th International Conference on Luminescence and Electron Spin - Toruń, Poland
Duration: 10 Jul 201114 Jul 2011

Keywords

  • POTASSIUM
  • SEDIMENT EXTRACTS
  • QUARTZ
  • LA-ICP-MS
  • Signal intensity
  • SPECTRA
  • SAMPLES
  • Dose-rate
  • SIGNALS
  • Feldspar
  • DOSE-RATE
  • Thermal stability
  • THERMOLUMINESCENCE
  • PROTOCOL
  • Luminescence

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