A Glaciaçao plistocénica na Serra do Gerês
- Autores: José Luís Zêzere, Juan Ramón Vidal Romaní, António de Brum Ferreira, Maria Luísa Estevao Rodrigues
- Localización: Finisterra: Revista Portuguesa de Geografia, ISSN 0430-5027, Vol. 35, Nº 69, 2000, págs. 39-68
- Idioma: portugués
- Enlaces
- Dialnet Métricas: 3 Citas
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Resumen
Studies from Schmidt-Thomé (1973, 1978) and from Coudé-Gaussen (1978, 1979, 1981) which defend a Pleistocene glaciation in the Gerês mountain gave origin to live controversy. In order to clarify the problem, the authors of the present study elected two lines of research: 1) detailed geomorphologic mapping; and 2) laboratory analysis of the glacial deposits. This sedimentologic study, which had not been carried out before in the area, proved to be very significant for the diagnosis of the style and the extent of the glaciation. We do confirm the Serra do Gerês glaciation. The vestiges are particularly clear and important in the eastern part of the mountain and in the Fafião Valley, where is to be found the most important glacigenic sediment complex. At the glaciation maximum, an ice dome reached the thickness of some 150 m in both the Couce and the Compadre areas, whence outlet glaciers radiated into the main peripheral valleys. At that time the upstream sector of the Homem Valley glacier must have reached the thickness of about 300 m. Recent absolute dating, using cosmogenic isotopes in glaciated granitic surfaces, suggest that the glaciation maximum in the Gerês is older than the Last Glaciation
