Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary |
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| Institution: | 1. Luminescence Dating Laboratory, Birbal Sahni Institute of Palaeobotany, Lucknow, 226007, India;2. Department of Humanities and Social Sciences, Indian Institute of Science Education and Research, Mohali, 140306, India;3. Centre for Nuclear Technologies, Risoe-DTU, 4000, Roskilde, Denmark;4. Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, 380009, India;5. Department of Archaeology and Ancient History, Faculty of Arts, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;6. Department of Geology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;7. Centre of Advanced Study in Geology, Panjab University, Chandigarh, 160014, India;8. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India;1. SUERC, Scottish Enterprise and Technology Park, Rankine Avenue, East Kilbride, Scotland, G75 0QF, UK;2. Department of Anthropology, Bates College, Pettengill Hall, Lewiston, ME 04240, USA;1. School of Environment, Education and Development, University of Manchester, M13 9PL, United Kingdom;2. SoGE, University of Oxford, OX1 3QY, United Kingdom;3. Department of Geography, University of Sheffield, Winter St., Sheffield, S10 2TN, United Kingdom;1. Birbal Sahni Institute of Palaeosciences, Lucknow, India;2. Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India;3. Wadia Institute of Himalayan Geology, Dehradun, India;4. Department of Geology, Banaras Hindu University, Varanasi, India;1. Archaeology, Classics and Egyptology, HLC, University of Liverpool, L69 3BX Liverpool, UK;2. Department of Earth, Ocean and Ecological Sciences, University of Liverpool, L69 3BX Liverpool, UK;3. Stone Age Institute, Bloomington, Indiana, 47433, USA;4. ERAAUB, Department of History and Archaeology, University of Barcelona, c/Montalegre, 6-8, 08001 Barcelona, Spain;5. School of Environmental Sciences, University of Liverpool, L69 3BX, UK;6. The Australian Archaeomagnetism Laboratory, Department Archaeology and History, La Trobe University, Melbourne Campus, Bundoora, 3086, VIC, Australia;7. Palaeo-Research Institute, University of Johannesburg, Gauteng, South Africa;8. c/o National Museums of Kenya, P.O. Box 40658, Nairobi, Kenya;9. Department of Earth Sciences, National Museums of Kenya, P.O. Box 40658, Nairobi, Kenya;10. Scottish Universities Environmental Research Centre, Isotope Geosciences Unit, Rankine Avenue, East Kilbride, G75 0QF Scotland, UK;11. Department of Earth and Environmental Science, University of St Andrews, KY16 9AJ St Andrews, UK;12. Department of Palynology, National Museums of Kenya, P.O. Box 40658, Nairobi, Kenya;13. GeoZentrum Nordbayern, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, 91054 Erlangen, Germany;14. ICREA, Pg. Lluis Companys 23, 08010 Barcelona, Spain;1. Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark |
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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 30–40 %) using RD-IRSL and RD-pIRSL were comparable with the palaeomagnetic dating and were a factor of three higher than conventional pIR-IRSL, TRL, IR-RL and VSL ages. |
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| Keywords: | IRSL dating Feldspar dating VSL Post IR IRSL Dhansi formation |
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