On the interest of using the multiple center approach in ESR dating of optically bleached quartz grains: Some examples from the Early Pleistocene terraces of the Alcanadre River (Ebro basin,Spain) |
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| Institution: | 1. Program of Geochronology, Centro nacional de investigación sobre la evolución humana (CENIEH), Burgos, Spain;2. Research School of Earth Sciences, The Australian National University, Canberra, Australia;3. Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;4. National Museum of Natural Sciences (MNCN), CSIC, Madrid, Spain;5. Geografía y Ordenación del Territorio, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;1. Geochronology, Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain;2. Research School of Earth Sciences, The Australian National University, Canberra, Australia;3. Environmental Futures Research Institute, Griffith University, Brisbane, Australia;1. Southern Cross GeoScience, Southern Cross University, Lismore, NSW, 2480, Australia;2. Australian Research Centre for Human Evolution (ARCHE), Environmental Futures Research Institute, Griffith University, Nathan, QLD, 4111, Australia;3. Laboratoire Géologie de Lyon: Terre, Planètes, Environnement, Université de Lyon and Ecole Normale Supérieure de Lyon, UMR CNRS 5276, F-69622, Villeurbanne, France;1. Leibniz Institute of Applied Geophysics, Stilleweg 2, D-30655 Hannover, Germany;2. Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Okayama 700-0005, Japan;3. Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Japan;1. Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, Spain;2. Research School of Earth Sciences, The Australian National University, Australia;1. Centro Nacional de Investigación sobre La Evolución Humana (CENIEH), Paseo Sierra de Atapuerca, 3, 09002, Burgos, Spain;2. Australian Research Centre for Human Evolution (ARCHE), Griffith University, Nathan, QLD, 4111, Australia;3. School of Physical Sciences, Environment Institute, Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, Australia;4. Departamento de Ecología y Geología, Facultad de Ciencias, Universidad de Málaga, Campo de Teatinos S/n, 29071, Málaga, Spain;5. Institut Català de Paleoecología Humana i Evolució Social (IPHES), Spain |
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| Abstract: | The present work reports the first numerical ages obtained for the two highest fluvial terraces (Qt1 and Qt2) of the Alcanadre River system (Northeastern Spain) representing the earliest remnants of Quaternary morphosedimentary fluvial activity in the Ebro basin. ESR dating method was applied to optically bleached quartz grains and both the Al and Ti centers were measured, in accordance with the Multiple Center approach. The results are overall in good agreement with the existing preliminary chronostratigraphic framework and our interpretation indicate that terraces Qt1 and Qt2 have an ESR age of 1276 ± 104 ka and 817 ± 68 ka, respectively. These data provide some chronological insights on the beginning of the fluvial sedimentary processes in a scenario of incision maintained over Quaternary in the Ebro Basin. These are among the first numerical ages obtained for such high terraces in the Iberian Peninsula.Our results demonstrate the interest of using the Multiple Center approach in ESR dating of quartz, since the two centers provide complementary information, i.e. an independent dose control. The overall apparent consistency between the ESR age estimates and the existing preliminary chronostratigraphic framework may be considered as an empirical evidence that the Ti–Li center may actually work for Early Pleistocene deposits, whereas the Ti–H center shows some clear limitations instead. Finally, these results demonstrate the interest of using ESR method to date Early Pleistocene fluvial terraces that are usually beyond the time range covered by the OSL dating method. |
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| Keywords: | Quaternary geochronology Electron spin resonance dating Optically bleached quartz grains Fluvial deposits Terraces Alcanadre river Ebro basin |
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