Constraining the timing of palaeosol development in Iranian arid environments using OSL dating

Zakieh Rashidi, Reza Sohbati, Alireza Karimi*, Mohammad Hadi Farpoor, Farhad Khormali, Warren Thompson, Andrew Sean Murray

*Corresponding author for this work

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    The ages of palaeosols in arid environments in Iran are constrained using the optically stimulated luminescence (OSL) signal from quartz. The luminescence properties of quartz OSL and K-feldspar infrared stimulated luminescence (IRSL) at 50 °C (IR50) and post-IR IRSL at 290 °C (pIRIR290) signals are compared to investigate the degree of bleaching of quartz OSL in individual samples at the time of deposition. A comparison between the quartz OSL and K-feldspar IR50 ages shows that 12 out of 15 samples were probably well-bleached prior to deposition. The 17 OSL ages constrain at least four broad phases of sediment deposition and soil formation on the central Iranian plateau: (i) prior to, and (ii) during, mid/late MIS 5 (at Isfahan and Lar), (iii) MIS 3 (at Bam, Mahan and probably Isfahan) and (iv) MIS 1 (at Rayen and Jiroft). In summary, there is no convincing evidence for palaeosol formation during MIS 4 and MIS 2; however pedogenesis does appear to have taken place during all other marine isotope stages over the last full glacial-interglacial cycle.
    Original languageEnglish
    JournalQuaternary Geochronology
    Pages (from-to)92-100
    Publication statusPublished - 2019


    • Chronostratigraphy
    • Luminescence dating
    • Palaeoclimate
    • Bleaching
    • Marine isotope stage
    • Quartz OSL

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