The deglaciation of the Sierra Nevada (Southern Spain)
Por:
Gómez-Ortiz A., Palacios D., Palade B., Vázquez-Selem L., Salvador-Franch F.
Publicada:
15 jul 2012
Categoría:
Earth-Surface Processes
Resumen:
Cosmogenic Cl-36 surface exposure dating was carried out on 19 samples from glacially polished bedrock, rock glaciers and moraines of four glaciated valleys with different orientations in the Sierra Nevada (Spain) around Pico del Veleta (37 degrees 3'N 3 degrees 21'W, 3398 m asl). Remains of moraines older than the global Last Glacial Maximum exist, but their poor preservation makes them an unreliable subject for surface exposure dating. Results show that the last local glacial maximum advance took place earlier than the global Last Glacial Maximum, but within the MIS 2, although additional dating is needed to confirm this. Exposure ages from bedrock steps show a general glacier retreat in progress by 15-14 ka. Shortly afterwards an extensive system of rock glaciers formed at the base of the valley headwalls, with the most recent rock glacier lasting until 7 ka ago. From their location, morphology and analysis of other proxies, we interpret their origin as related to the deglaciation p
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Geog, Mexico City 04510, DF, Mexico
Departamento de Geografía Física y Análisis Geográfico Regional, Universidad de Barcelona, Spain
Departamento de Análisis Geográfico Regional y Geografía Física, Universidad Complutense de Madrid, Spain
Centro de Satélites de la Unión Europea (EUSC), Torrejón de Ardoz (Madrid), Spain
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