Luminescence dating of Middle Pleistocene (MIS 7) marine shoreline deposits along the eastern coast of Tunisia: A comparison of K-feldspar and Na-feldspar IRSL ages |
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| Institution: | 1. Laboratoire Halma UMR 8164 (CNRS), Université Lille 1, 59655 Villeneuve d''Ascq Cedex France;2. Laboratoire de Luminescence LUX, Département des Sciences de la Terre et de l''Atmosphère, Université du Québec à Montréal, CP 8888 Succ. Centre-Ville, H3C 3P8 Montréal, Canada;3. Laboratoire de Géomorphologie, Département de Géographie, Université de Tunis, 94 bd du 9 avril 1938, Tunis, Tunisia;1. Interdisciplinary Research Institute on Bio-Nano-Science of Babe?-Bolyai University, Treboniu Laurean 42, 400271 Cluj-Napoca, Romania;2. Faculty of Physics, Babe?-Bolyai University, M. Kog?lniceanu 1, 400084 Cluj-Napoca, Romania;3. Chair of Geomorphology, University of Bayreuth, 95440 Bayreuth, Germany;4. Faculty of Environmental Science and Engineering, Babe?-Bolyai University, Fântânele 30, 400294 Cluj-Napoca, Romania;5. Faculty of Humanities, Valahia University, Lt. Stancu Ion 34-36, 130115 Târgovi?te, Romania;6. Institute of Speology, Romanian Academy, 400006 Cluj-Napoca, Romania;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Département de Préhistoire Muséum National d''Histoire Naturelle, UMR7194 du CNRS, 1, rue René Panhard 75013, Paris, France;1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;1. University of Washington, Department of Anthropology, Box 353412, Seattle, WA 98195-3412, USA;2. McDaniel College, Department of Physics, Westminster, MD 21157, USA;1. Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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| Abstract: | In the present study, we applied the IRSL50°C dating method to both K- and Na-feldspar coarse grains from interglacial coastal deposits in north-eastern Tunisia. We used the yellow IRSL50°C signal of Na-feldspars and the blue IRSL50°C signal of K-feldspars. The key-sites for this study are at El Hajeb (Sahel area) and Dar Oufa (Cap Bon Peninsula). These deposits belong to the “Douira Unit” which has previously been assigned to marine isotope stage (MIS) 7 on the basis of amino acid ratios and chronostratigraphic evidence.In order to assess the reliability of the IRSL50°C ages of the “Douira Unit”, we extended the IRSL dating technique to K- and Na-feldspars from two MIS 5 samples, with independent age control, collected within shallow-marine sands in the Sahel area and on the Jerba island (southern Tunisia).Two protocols of age correction for the observed fading in K- and Na-feldspars have been applied: (1) the Huntley and Lamothe (2001) fading correction and (2) the dose rate correction developed by Lamothe et al. (2003). The fading corrected IRSL ages of the “Douira Unit” and both MIS 5 control samples, measured on K- and Na-feldspars, are in good agreement with their expected ages. |
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| Keywords: | IRSL dating K-feldspar Na-feldspar Middle Pleistocene Sea-level highstand Paleoshoreline Tunisia |
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