Testing the potential of elevated temperature post-IR IRSL signals for dating Romanian loess |
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| Institution: | 1. Laboratory of Mineralogy and Petrology (Luminescence Research Group), Department of Geology and Soil Science, Ghent University, Krijgslaan 281 (S8), B-9000 Ghent, Belgium;2. Faculty of Environmental Sciences and Engineering, Babeş-Bolyai University, Fântânele 30, 400294 Cluj Napoca, Romania;3. Faculty of Geology and Geophysics, Paleomagnetic Laboratory, University of Bucharest, N. Bălcescu 1, 010041 Bucharest, Romania;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, DK-4000 Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;1. USU Luminescence Laboratory, 1770 N. Research Pkwy, Suite 123, North Logan, UT 84341, USA;2. Department of Geology, 4505 Old Main Hill, Utah State University, Logan, UT 84322-4505, USA;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde 4000, Denmark;3. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel;4. Dead Sea-Arava Science Center, Patio 655, Eilat 88133, Israel;1. Department of Dosimetry and Application of Ionizing Radiation, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, Prague 115 19, Czech Republic;2. Nuclear Physics Institute of the Academy of Sciences of the Czech Republic, Husinec-Řež 130, 250 68, Czech Republic;1. Institute of Applied Geology, Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences, Peter Jordan-Straße 70, 1190 Vienna, Austria;2. Department of Geography, Justus-Liebig-University Giessen, Senckenbergstraße 1, 35390 Giessen, Germany |
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| Abstract: | In this study we test the potential of the elevated temperature infrared stimulated luminescence (IRSL) signals for dating Romanian loess. The recently developed post-IR IRSL protocol is applied to Romanian loess using polymineral fine grains extracted from the loess-palaeosol sequence at Mircea Vodă (SE Romania). This approach is aimed at obtaining an additional age control to examine the age discrepancy obtained from previous optically stimulated luminescence (OSL) studies using different grain-sizes of quartz (4–11 μm and 63–90 μm).Two preheat post-IR IR stimulation temperature combinations were used, 250–225 °C and 325–300 °C, respectively. The signals obtained are documented in terms of dose response curve, laboratory tests and fading. Although both post-IR IRSL signals exhibit small fading rates, dose response characteristics indicate that these rates may be laboratory artefacts. The post-IR IRSL signal stimulated at 300 °C is observed to suffer from dose dependent initial sensitivity changes as both natural and regenerated signals are observed to lie above the saturation level of the dose response curve. Uncorrected age results obtained using both post-IR IRSL signals are in general agreement with previously reported silt-sized quartz OSL ages for samples collected from the uppermost loess unit L1. For older material, the post-IR IRSL signal stimulated at 225 °C is considered to provide reliable age results, in agreement with independent age control available for this sequence. |
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