A comparative study of the luminescence characteristics of polymineral fine grains and coarse-grained K-, and Na-rich feldspars

Publication: Research - peer-reviewConference article – Annual report year: 2012

  • Author: Tsukamoto, Sumiko, Germany

    Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydorology, Germany

  • Author: Jain, Mayank

    Radiation Physics, Center for Nuclear Technologies, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Murray, Andrew S., Denmark

    Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Denmark

  • Author: Thiel, Christine

  • Author: Schmidt, Esther, Germany

    Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydorology, Germany

  • Author: Wacha, Lara, Germany

    Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydorology, Germany

  • Author: Dohrmann, Reiner, Germany

    Federal Institute for Geosciences and Natural Resources (BGR)/ State Authority for Mining, Energy and Geology (LBEG), Germany

  • Author: Frechen, Manfred, Germany

    Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydorology, Germany

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The IRSL and post-IR IRSL (pIRIR) signal characteristics of polymineral fine grains are investigated and compared with those of K- and Na-rich feldspar extracts. TL signal loss after IR and pIRIR stimulations occurs mainly at around 320 °C for polymineral and Na-feldspar samples and around 410 °C for K-feldspar samples, when a preheat temperature of 250 °C for 60 s is used. After preheating to a higher temperature (320 °C for 60 s) all samples show a TL reduction around 410 °C in the blue detection window. Pulse annealing experiments for IRSL and pIRIR signals for preheats between 320 °C and 500 °C indicate that the signal stabilities are similar among the different feldspar types, when a higher preheat temperature (>320 °C) is used. Thermal activation energies for IRSL and pIRIR signals are largest in K-feldspar and smallest in polymineral fine grains, in both blue and UV detection windows for both fast time-resolved (TR) and continuous wave (CW) signals. These results suggest that IRSL and pIRIR signals in polymineral fine grains originate mainly from Na-feldspar grains; these signals are less thermally stable than those from K-feldspar, but a more stable signal (presumably from K-feldspar grains) can be obtained using a higher preheat temperature.

Original languageEnglish
JournalRadiation Measurements
Publication date2012
Volume47
Pages903-908
ISSN1350-4487
DOIs
StatePublished

Conference

Conference13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011
CountryPoland
CityTorun
Period10/07/1114/07/11
CitationsWeb of Science® Times Cited: 5

Keywords

  • Feldspar, Polymineral, IRSL, Post-IR IRSL, Thermal stability, Time-resolved IRSL
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