Cartografia geomorfológica das formas glaciárias da Serra Amarela (PNPG)

Abstract

Geomorphological evidence for the Pleistocene glaciation of Serra Amarela (Peneda-Gerês National Park) was provided by Coudé-Gaussen in 1981. However, the limits of the glaciated area are imprecise for glacial reconstruction. This mountain is characterized by its W-E asymmetric topography and by the dominance of granitic lithology over restricted metamorphic outcrops. The steep western slopes are dominated by fluvial and relict periglacial landforms, but the steep eastern slopes show evidence of former glacial erosion and deposits, particularly in the Ramisquedo glacial cirque. Fluvioglacial and slope deposits are frequently observed on the valley floors and mountainsides. This work presents a new geomorphological map of the Serra Amarela, accomplished through the analysis and interpretation of high-resolution LiDAR data, complemented by laboratory analysis and fieldwork validations of the deposits. This new map and data will allow the definition of the Glacial Maximum Extent (GME), ice thickness and Equilibrium-Line Altitude for the Serra Amarela glaciation.