University of Tasmania
Browse

File(s) under permanent embargo

Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons

journal contribution
posted on 2023-05-20, 03:13 authored by Arnold, LJ, Demuro, M, Spooner, NA, Prideaux, GJ, Matthew McDowellMatthew McDowell, Camens, AB, Reed, EH, Pares, JM, Arsuaga, JL, Bermudez de Castro, JM, Carbonell, E
Previous assessments of thermally transferred optically stimulated luminescence (TT-OSL) signal resetting in natural sedimentary settings have been based on relatively limited numbers of observations, and have been conducted primarily at the multi-grain scale of equivalent dose (De) analysis. In this study, we undertake a series of single-grain TT-OSL bleaching assessments on nineteen modern and geological dating samples from different sedimentary environments. Daylight bleaching experiments performed over several weeks confirm that single-grain TT-OSL signals are optically reset at relatively slow, and potentially variable, rates. Single-grain TT-OSL residual doses range between 0 and 24 Gy for thirteen modern samples, with > 50% of these samples yielding weighted mean De values of 0 Gy at 2σ. Single-grain OSL and TT-OSL dating comparisons performed on well-bleached and heterogeneously bleached late Pleistocene samples from Kangaroo Island, South Australia, yield consistent replicate age estimates. Our results reveal that (i) single-grain TT-OSL residuals can potentially be reduced down to insignificant levels when compared with the natural dose range of interest for most TT-OSL dating applications; (ii) the slow bleaching properties of TT-OSL signals may not necessarily limit their dating applicability to certain depositional environments; and (iii) non-trivial differences may be observed between single-grain and multi-grain TT-OSL bleaching residuals in some modern samples. Collectively, these findings suggest that single-grain TT-OSL dating may offer advantages over multi-grain TT-OSL dating in certain complex depositional environments.

History

Publication title

Quaternary Geochronology

Volume

49

Pagination

45-51

ISSN

1871-1014

Department/School

School of Natural Sciences

Publisher

Elsevier

Place of publication

Netherlands

Rights statement

© 2018 Elsevier B.V. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Terrestrial biodiversity

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC