Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary

P. Morthekai, P.R. Chauhan, Mayank Jain, A.D. Shukla, H.M. Rajapara, K. Krishnan, D.A. Sant, R. Patnaik, D.V. Reddy, A.K. Singhvi

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    Abstract

    This study attempted to probe a geologically more stable IR stimulated luminescence signal (IRSL) that explored so far. IRSL, probes the proximal pairs and, pIRSL measurements at elevated temperatures consume more distant pairs. We surmised that the residual IRSL after pIR-IRSL should arise from most distant pairs and hence should be more stable. A thermal stimulation after pIR-IRSL leads to redistribution of charges including distant pairs and this can be probed by further IRSL and pIRSL (post IR IRSL) measurements. This post IRSL following a thermal treatment is termed as redistributed IRSLs (RD IRSL and RD pIRSL) and contributes about 10% of total IRSL counts from a pristine sample. As expected RD, IRSLs are poor to be solar bleachable. Burial age of around 800 ka(with 30e40 %) using RD-IRSL and RDpIRSL were comparable with the palaeomagnetic dating and were a factor of three higher than conventional pIR-IRSL, TRL, IR-RL and VSL ages. © 2015 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume30
    Issue numberPart B
    Pages (from-to)154–160
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2015

    Keywords

    • IRSL dating
    • Feldspar dating
    • VSL
    • Post IR IRSL
    • Dhansi formation

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