Single-grain dating of young sediments using the pIRIR signal from feldspar

Tony Reimann, Kristina Jørkov Thomsen, Mayank Jain, Andrew S. Murray, Manfred Frechen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In this article we test for the first time the potential of single-grains of K-rich feldspar to date well-bleached and poorly bleached sediments using a post-IR IRSL (pIRIR) protocol. We measure natural dose distributions using K-rich feldspars from four coastal samples applying the pIRIR protocol with a preheat of 200°C and a pIRIR stimulation temperature of 180°C; each sample had an independent age control obtained from quartz OSL and radiocarbon dating. We also analyse single-grain dose distributions of “zero-dose” and γ-irradiated samples to determine thermal transfer/residual doses and the intrinsic sources of variability of pIRIR single-grain measurements, respectively. Based on these experiments, we conclude that thermal transfer/residual dose give rise to an offset of ∼0.6Gy in these samples and that the uncertainty assigned to individual pIRIR single-grain dose estimates cannot be smaller than 16.5%.The analysis of the well-bleached samples shows that only the brightest 30% of the grains give pIRIR single-grain ages in agreement with the age control; this effect may arise from the suggested correlation between blue emission and potassium content of individual grains. Comparison of single-grain quartz and feldspar dose distributions from the poorly bleached samples shows that quartz is relatively better bleached; nevertheless, selection of a reliable ‘minimum’ feldspar dose was achieved using two different statistical models.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume11
    Pages (from-to)28-41
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2012
    Event13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011 - Torun, Poland
    Duration: 10 Jul 201114 Jul 2011

    Conference

    Conference13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011
    CountryPoland
    CityTorun
    Period10/07/201114/07/2011

    Keywords

    • Feldspar single-grains
    • Post-IR IRSL protocol
    • Incomplete bleaching feldspar
    • Young sediments

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