Chronology and paleoenvironmental interpretation of talus flatiron sequences in a sub-humid mountainous area : Tremp Depression, Spanish Pyrenees

Auteur(s) et Affiliation(s)

ROQUÉ, C.

Àrea de Geodinàmica Externa i Geomorfologia, Univ., Girona, Espagne

LINARES, R.

External Geodynamics and Hydrogeology Group, Dept. of Geology, Geological Cabinet of Territorial and Environmental Analysis (GATA), Autonomous Univ., Barcelona, Espagne

ZARROCA, M.

External Geodynamics and Hydrogeology Group, Dept. of Geology, Geological Cabinet of Territorial and Environmental Analysis (GATA), Autonomous Univ., Barcelona, Espagne

PELLICER, X.M.

Geological Survey of Ireland, Dublin, Irlande

GUTIÉRREZ, F.

Dept. de Ciencias de la Tierra, Universidad de Zaragoza, Zaragoza, Espagne

Description :
Talus flatirons are debris-covered relict slopes, disconnected from the source area, which are relatively common in arid and semi-arid areas. Talus flatiron sequences developed in the Tremp Depression, eastern Spanish Pyrenees, are analysed from the geomorphological, chronological and paleoenvironmental perspective. The 2 groups of relict slopes differentiated by means of detailed geomorphological mapping have been dated by optically stimulated luminescence (OSL) and radiocarbon dating. The comparison of the ages obtained in the Tremp Depression with chronologies published for talus flatiron sequences in semi-arid areas and other paleoclimatic proxies suggests that the aggradation phases in the slopes occurred during periods with higher humidity and vegetation cover. The chronological differences observed between semi-arid Spain and the Tremp Depression may be partly related to the more humid climate of the latter mountain area.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 13, p. 1513-1522, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais