New evidence in the NW region of the Iberian Peninsula (~42°N 6°W) of a glacial advance coeval with the global Last Glacial Maximum (LGM) of the Marine Isotope Stage 2 has been identified through a dataset of exposure ages based on 23 10Be concentration measurements carried out on boulder samples taken from a set of latero-frontal moraines. Results span the interval 19.2-15.410Beka, matching the last deglaciation period when Iberia experienced the coldest and driest conditions of the last 25ka, and are consistent with Lateglacial chronologies established in other mountain regions from SW Europe. The extent of the LGM stade identified in this work is similar to the local maximum ice extent stade recorded and dated as prior to 33ka using radiocarbon and optically stimulated luminescence. This work showcases how multiple-dating approaches and detailed geomorphological mapping are required to reconstruct realistic palaeoglacier evolution models.
Bibliographical noteFunding Information:
Research funded by Spanish CICYT projects LIMNOCAL–CGL2006-13327-C04-01, GRACCIE-CSD2007-0006, TOPOIBERIA-CSD2006-0041 (Consolider Ingenio Program), RISKNAT-2009SGR520, and Fundación Patrimonio Natural CyL. L. Rodríguez-Rodríguez is granted by the Severo Ochoa (FICYT–Asturias) and the FPU (Spanish MECD) programs. The AMS facility ASTER (CEREGE) is supported by the INSU/CNRS , the French MESR , and the CEA institute . We are grateful to M. Arnold, G. Aumaître, and K. Keddarouche for the AMS measurements and to the Administration of the Sanabria Natural Park for the sampling permissions. We thank to the reviewers their comments and suggestions that contributed to improve the original version this manuscript.
Copyright 2013 Elsevier B.V., All rights reserved.
- Cosmogenic dating
- Glacial geomorphology
- Iberian Peninsula
- Ice cap
- Last Glacial Maximum
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