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Cartografia geomorfológica glaciária e delimitação da paleoglaciação da Serra Amarela
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Abstract(s)
RESUMO: A investigação geomorfológica sobre a glaciação plistocénica da Serra Amarela, inserida no Parque Nacional da Peneda-Gerês (PNPG), remonta ao início da década de 80. No entanto, os limites da área glaciada permanecem imprecisos para a reconstrução glaciária. Esta montanha de baixa altitude com 1361 m caracteriza-se pela sua topografia assimétrica
W-E e predomínio de litologia granítica sobre afloramentos metamórficos restritos. As encostas ocidentais íngremes são dominadas por formas de relevo relíquias fluviais e periglaciárias. Por outro lado, as encostas orientais íngremes revelam evidências de erosão e depósitos glaciários anteriores, particularmente no circo glaciário do Ramisquedo. O presente estudo apresenta um novo mapa geomorfológico da Serra Amarela, utilizando dados LiDAR de elevada resolução espacial e interpretações das formas de relevo validadas por trabalho de campo. Os dados recolhidos, relativamente à glaciação da Serra Amarela, permitiram, metricamente, definir: a Máxima Extensão Glaciária (MEG) de 1 km2, a espessura máxima de gelo de 92 m, o volume estimado em 26,4 hm3, e posicionar a ELA-AABR nos 1122 m.
ABSTRACT: Geomorphological research on the Pleistocene glaciation of Serra Amarela, located in the Peneda-Gerês National Park (PNPG), dates to the early 1980s. However, the boundaries of the glaciated area remain imprecise for glacial reconstruction. This low-lying mountain with 1361 m of altitude is characterized by its W-E asymmetric topography and by the dominance of granitic lithology and sparse metamorphic rocks. Fluvial and relict periglacial landforms dominate the steep western slopes. On the other hand, the steep eastern slopes reveal evidence of former glacial activity with traces of erosion and deposits, particularly in the Ramisquedo glacial cirque. The current study introduces a new geomorphological map of Serra Amarela, created using high-resolution LiDAR data and supplemented with interpretations of landforms and validated through fieldwork. The collected data, on the glaciation of Serra Amarela, allowed us to make several key measurements: the Maximum Glacial Extent (MGE) at 1 km², the maximum ice thickness at 92 m, an estimated volume of 26,4 hm3, and the ELA-AABR at 1122 m.
ABSTRACT: Geomorphological research on the Pleistocene glaciation of Serra Amarela, located in the Peneda-Gerês National Park (PNPG), dates to the early 1980s. However, the boundaries of the glaciated area remain imprecise for glacial reconstruction. This low-lying mountain with 1361 m of altitude is characterized by its W-E asymmetric topography and by the dominance of granitic lithology and sparse metamorphic rocks. Fluvial and relict periglacial landforms dominate the steep western slopes. On the other hand, the steep eastern slopes reveal evidence of former glacial activity with traces of erosion and deposits, particularly in the Ramisquedo glacial cirque. The current study introduces a new geomorphological map of Serra Amarela, created using high-resolution LiDAR data and supplemented with interpretations of landforms and validated through fieldwork. The collected data, on the glaciation of Serra Amarela, allowed us to make several key measurements: the Maximum Glacial Extent (MGE) at 1 km², the maximum ice thickness at 92 m, an estimated volume of 26,4 hm3, and the ELA-AABR at 1122 m.
Description
Keywords
Serra Amarela Glaciações plistocénicas LiDAR Cartografia geomorfológica Pleistocene glaciations Geomorphological mapping
Citation
Figueira, E., Gomes, A. & Costa, J. (2025). Cartografia geomorfológica glaciária e delimitação da paleoglaciação da Serra Amarela. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 135-139. https://doi.org/10.34637/f71z-a245
Publisher
LNEG - Laboratório Nacional de Energia e Geologia