skip to main content
Idioma:
Tipo de recurso Mostra resultados com: Mostra resultados com: Índice

Glacial stages and post-glacial environmental evolution in the Upper Garonne valley, Central Pyrenees

Fernandes, M. ; Oliva, M. ; Palma, P. ; Ruiz-Fernández, J. ; Lopes, L.

The Science of the total environment, 2017-04, Vol.584-585, p.1282-1299 [Periódico revisado por pares]

Netherlands: Elsevier B.V

Texto completo disponível

Citações Citado por
  • Título:
    Glacial stages and post-glacial environmental evolution in the Upper Garonne valley, Central Pyrenees
  • Autor: Fernandes, M. ; Oliva, M. ; Palma, P. ; Ruiz-Fernández, J. ; Lopes, L.
  • Assuntos: Central Pyrenees ; Deglaciation ; Geomorphology ; Holocene ; Last Glaciation ; Upper Garonne
  • É parte de: The Science of the total environment, 2017-04, Vol.584-585, p.1282-1299
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The maximum glacial extent in the Central Pyrenees during the Last Glaciation is known to have occurred before the global Last Glacial Maximum, but the succession of cold events afterwards and their impact on the landscape are still relatively unknown. This study focuses on the environmental evolution in the upper valley of the Garonne River since the Last Glaciation. Geomorphological mapping allows analysis of the spatial distribution of inherited and current processes and landforms in the study area. The distribution of glacial records (moraines, till, erratic boulders, glacial thresholds) suggests the existence of four glacial stages, from the maximum expansion to the end of the glaciation. GIS modeling allows quantification of the Equilibrium Line Altitude, extent, thickness and volume of ice in each glacial stage. During the first stage, the Garonne glacier reached 460m in the Loures-Barousse-Barbazan basin, where it formed a piedmont glacier 88km from the head and extended over 960km2. At a second stage of glacier stabilization during the deglaciation process, the valley glaciers were 12–23km from the head until elevations of 1000–1850m, covering an area of 157km2. Glaciers during stage three remained isolated in the upper parts of the valley, at heights of 2050–2200m and 2.6–4.5km from the head, with a glacial surface of 16km2. In stage four, cirque glaciers were formed between 2260m and 2590m, with a length of 0.4–2km and a glacial area of 5.7km2. Also, the wide range of periglacial, slope, nival and alluvial landforms existing in the formerly glaciated environments allows reconstruction of the post-glacial environmental dynamics in the upper Garonne basin. Today, the highest lands are organized following three elevation belts: subnival (1500–1900m), nival (1900–2300m) and periglacial/cryonival (2300–2800m). [Display omitted] •We examine glacial and post-glacial environmental stages in the Upper Garonne.•Four glacial stages have been inferred since the local last glacial maximum.•The maximum ice extent formed a piedmont glacier 88.7km long covering 693km2.•Next glacial stages formed smaller valley glaciers followed by cirque glaciers.•Present environmental dynamics is organized in: subnival, nival, periglacial belts.
  • Editor: Netherlands: Elsevier B.V
  • Idioma: Inglês
Links
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.