Last Glacial Maximum and deglaciation of Sierra de Gredos, central Iberian Peninsula
Por:
Palacios D., de Marcos J., Vázquez-Selem L.
Publicada:
1 mar 2011
Categoría:
Earth-Surface Processes
Resumen:
The study area is located in the Sierra de Credos, a portion of the Sistema Central range of central Spain, specifically in the Credos Gorge, on the north side of Pico Almanzor (2596 masl), where glacial forms are present down to an altitude of 1410 m, 10 km from the headwall. This paper presents cosmogenic Cl-36 surface exposure dates of four closely spaced lateral moraine ridges within the area of maximum advance of the ancient glacier, 8 km from the headwall; and two glacially polished bedrock thresholds 3 and 5 km from the headwall. The dates are overall coherent and indicate a maximum advance at 26-24 ka. Subsequently the glacier front stabilized around its maximum position for similar to 3 ka, with small scale fluctuations resulting in small, closely spaced moraines ridges. Glacier recession began after 21 ka, accelerating sharply by similar to 16 ka. The glacier had probably disappeared from the Gredos Gorge by 15 ka. There are no traces of older or more recent moraines than tho
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Geog, Mexico City 04510, DF, Mexico
Departamento de A.G.R. y Geografía Física, Universidad Complutense, 28040 Madrid, Spain
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