Assessing soil mixing processes and rates using a portable OSL-IRSL reader: Preliminary determinations |
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| Affiliation: | 1. Department of Earth and Space Sciences, University of California, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095-1567, USA;2. ASU School of Earth and Space Exploration, PO Box 871404, Tempe, AZ 85287-1404, USA;1. Institut de Recherche sur les Archéomatériaux, UMR 5060 CNRS – Université de Bordeaux, Centre de Recherche en Physique Appliquée à l''Archéologie (CRP2A), Maison de l''archéologie, 33607 Pessac Cedex, France;2. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany;1. Geomorphology and Portable Luminescence Laboratory Leon Recanati Institute for Maritime Studies, U. of Haifa, Abba Hushi Ave., 199, Mt. Carmel, Haifa 3498838, Israel;2. Dept. of Geography and Environmental Studies, U. of Haifa, Abba Hushi Ave., 199, Mt. Carmel, Haifa 3498838, Israel;3. Luminescence Laboratory, School of Resources and Environmental Sciences, Linyi University, Linyi, China;4. Dr. Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Mount Carmel, Haifa, Israel;5. Analytical Laboratory, The Artifacts Treatment, Conservation and Laboratories Dept., Israel Antiquities Authority, Har-Hotzvim, Jerusalem, Israel;1. Department of Geography, University of Sheffield, Winter Street, Sheffield S10 2TN, United Kingdom;2. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USA;1. Soil Geography and Landscape Group, Netherlands Centre for Luminescence Dating, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands;2. Group for Rural Hydrology and Hydraulics, Department of Agronomy, University of Cordoba, Spain;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 |
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| Abstract: | Employing a portable luminescence reader in a novel approach for studying soil mantles can help to both better our understanding of and determine the relative importance of the different erosional processes operating on a given landscape. By measuring bulk IRSL signal intensity of unprepared regolith samples as a function of depth, a portable reader has been used to rapidly explore patterns and rates of soil mixing within the actively uplifting San Gabriel Mountains, southern California, USA. Both IRSL and OSL measurements were taken from three different hillslope soil profiles collected within a 100 m radius, as well as a number of bedrock samples. To gauge the rates of grain mixing, bulk IRSL signals are converted to dose values by measuring IRSL growth as a function of dose in a conventional luminescence reader using smaller subsamples from key locations. These data are combined with dose rate determinations based on both in-situ NaI gamma spectrometer measurements and chemical determinations of U, Th and K, in order to convert dose values into “effective age” estimates; these values represent mixed regolith and soil, and not age of sediment deposition. This approach has generated soil turn-over histories much more complex than our simple, signal saturation-with-depth model predicts. |
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