Single-grain and multi-grain OSL dating of river terrace sediments in the Tabernas Basin, SE Spain

M.R. Geach, Kristina Jørkov Thomsen, Jan-Pieter Buylaert, Andrew Murray, A.E. Mather, M.W. Telfer, M. Stokes

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    Abstract

    River terraces represent important records of landscape response to e.g. base-level change and tectonicmovement. Both these driving forces are important in the southern Iberian Peninsula. In this study,Optically Stimulated Luminescence (OSL) dating was used to date two principal river terraces in theTabernas Basin, SE Spain. A total of 23 samples was collected from the fluvial terraces for dating usingquartz OSL. Sixteen of the samples could not be dated because of low saturation levels (e.g. typical2xD0 < 50 Gy). The remaining seven samples (5 fossil and 2 modern analogues) were investigated usingboth multi-grain and single-grain analysis. Single grain results show that: (i) measurements from multigrainaliquots overestimate ages by up to ~ 4 ka for modern analogues and young samples (<5 ka),presumably because (ii) the presence of many saturated grains has biased the multi-grain results to olderages. Despite the unfavourable luminescence characteristics we are able to present the first numerical agesfor two terrace aggradation stages in the Tabernas Basin, one at ~16 ka and the other within the last 2 ka.© 2015 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume30
    Issue numberPart B
    Pages (from-to)213–218
    Number of pages6
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Fluvial
    • Tectonics
    • Climate
    • OSL

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