Fossil debris-covered glaciers in Sierra de la Demanda (Northern Spain): geomorphologic research and 10Be dating.

Fernández-Fernández, José María
Palacios, David
Andrés, Nuria
Schimmelpfennig, Irene
Gómez-Villar, Amelia
Santos-González, Javier
Álvarez-Martínez, Javier
Arnáez, José
Úbeda, José
García-Ruiz, José M.

Publication date

January 2017

Publisher

HAL CCSD

Abstract

International audienceThe Demanda Sierra, at altitudes above 2000 m.a.s.l., is located in the Iberian Range (Northern Iberian Peninsula, 42º15’ N). The main divide extends from west to east between 3º25’ W and 2º52’ W. The most relevant evidence of Pleistocene glaciation is found in small cirques above 1800 m a.s.l., most of them in the northern face. These cirques hosted small-size glaciers with ice tongues <1 km in length that deposited moraines composed of angular blocks with scarce fine matrix. Several rock glaciers were identified in previous papers. Nevertheless, recent fieldwork suggests the reinterpretation of the large chaotic angular block accumulations without fine matrix as fossil debris-covered glaciers. To elucidate such a com...