The stratified slope deposits of Tierra del Fuego (Argentina) as an analogue for similar pleistocene deposits in Galicia (NW Spain)

Polígonos. Revista de Geografía

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Title The stratified slope deposits of Tierra del Fuego (Argentina) as an analogue for similar pleistocene deposits in Galicia (NW Spain)
Creator Pérez-Alberti, Augusto
Cunha, Pedro P.
Subject Geografía; Geografía Física
Stratified slope deposits; Cryonival processes; Fuegian Andes; Argentina; Serra do Courel; Galicia; Spain
Description This paper focuses on slope dynamics in schist/slate materials in cold humid environments. It characterises the sedimentological features and controls involved in the for-mation of stratified slope deposits in two areas with similar topographical, lithological and climatic characteristics. In both areas, the slopes have dips >30º and the dominant rock types are schists and slates. In the case of Tierra del Fuego, the sedimentary deposits studied are modern; those in Galicia are Pleistocene in age. The slope processes operating in Tierra del Fuego, gen-erating modern stratified slope sedimentary deposits, throw light upon the interpretation of similar ancient sediments studied in Galicia. This comparative study reveals the fundamental role played by snow and freeze-thaw cycles in the creation of stratified slope deposits. Firstly, snow cover has a direct effect on the slope, compacting sediments, keeping ground temperature stable during winter, or moving clasts as they slip down the slope or act as a slide ramp. Indirectly, as the snow melts, it creates surface run-off and mud or gravel slides. Secondly, the activity generated by numerous freeze-thaw cycles results in the vertical mobility of clasts. However, the continuous loading of sediments on the slope hinders the formation of coarse-grained pavement. Thirdly, the rock type and slope steepness play an important role in the creation of stratified slope deposits.
Publisher Universidad de León
Contributor Projects CGL2004-03380/BOS and POL2006-PC091 conducted by the Spanish Ministry of Education and Science. This study was also supported by the Fundação para a Ciência e a Tecnologia, through project UID/MAR/04292/2013 – MARE
Date 2016-10-11
Type info:eu-repo/semantics/article
Artículo revisado por pares
Format application/pdf
Source Polígonos. Revista de Geografía; Núm. 28 (2016): Periglaciarismo y Permafrost; 183-209
Language spa
Rights Copyright (c) 2016 Augusto Pérez-Alberti, Pedro P. Cunha

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