Application of Post-Violet IR Single Aliquot Regenerative Dose (pVIR-SAR) Protocol for Natural Polymineral Fine and Coarse Grain Samples

Devi et al. (2024) characterised a post Violet Infrared Stimulated Luminescence (pVIRSL) signal and developed a post Violet Infrared Single Aliquot Regenerative dose (pVIR-SAR) protocol for estimation of paleodoses. The protocol provides an opportunity for measuring polymineral samples as violet stimulation prior to IRSL measurement, bleaches natural luminescence signal of quartz and makes it possible to probe photo-transferred charges in feldspar through IR stimulation. This study presents the results of pVIR-SAR protocol on natural polymineral fine (4-11 m) and coarse (90-150 m) grain samples, including volcanic ash, pottery and fluvial deposits from varied geological provenances. The results show that pVIR-SAR ages of both polymineral fine and coarse grain samples are consistent with geological reasoning and available age controls thereby suggests that with the use of pVIR-SAR protocol, mineral separation can be dispensed. This study also reports on the bleachability, athermal fading rates and alpha efficiencies of pVIRSL for these samples and corresponding results are compared with IRSL at 50 °C and post IR IRSL (pIRIR) at 290 °C. The pVIRSL signal has a better bleachability and reproducibility compared to pIRIRSL signal. For the fluvial deposits dated in this study, the fine-grain samples provide ages consistent with the expected chronology.