RT Journal Article
T1 Geomorphological record of the glacial to periglacial transition from the Bølling–Allerød to the Holocene in the Central Pyrenees: the Lòcampo cirque in the regional context
A1 Fernandes, Marcelo
A1 Oliva, Marc
A1 Fernández Fernández, José María
A1 Vieira, Gonçalo
A1 Palacios Estremera, David
A1 Garcia‐Oteyza, Julia
A1 Ventura, Josep
A1 Schimmelpfennig, Irene
A1 Team, ASTER
AB In the highest tributaries of the Upper Garonne Basin, Central Pyrenees, cirques up to 2600 m a.s.l. were already deglaciated by 15–14 ka. The long-term deglaciation during Termination-1 (T-1) was interrupted by glacial advances within the cirques during the Bølling–Allerød (B-A) interstadial and the Younger Dryas stadial. The cirques preserve a variety of glacial and periglacial landforms whose chronologies are poorly known. This study is focused on the Lòcampo cirque (42°38′06″N and 0°59′10″E), Upper Garonne Basin, where a detailed geomorphological map and 10Be terrestrial cosmic ray exposure (CRE) dating allowed us to constrain the chrono-sequence between the glacial and periglacial domains. In the small Lòcampo cirque, a glacier formed a cirque moraine between 2200 and 2300 m a.s.l., which surrounds a relict rock glacier encompassing several transversal ridges. Additionally, longitudinal ridges typically observed in debris-covered glaciers are preserved between the moraine and the rock glacier. The eight-sample data set of CRE ages indicates the formation of the cirque moraine during the second half of the B-A, by 13.2±1.1 ka. Exposure ages from the rock glacier boulders show a range between 13.6±0.9 and 11.9±0.7 ka, which did not allow its formation to be chronologically constrained. Therefore, the environmental evolution following the moraine stabilization could follow the formation of a debris-covered glacier at the bottom of the Lòcampo cirque, with the subsequent formation of the rock glacier. After the rock glacier formation, its front rapidly ceased at 13.6±0.9 ka, while the upper ridges gradually stabilized until it became definitively relict at 11.9±0.7 ka or afterwards. These results show evidence of the complex glacial to periglacial transition that needs more robust chronological data sets to better understand the role of climate forcing and local topography during the deglaciation in mid-latitude mountain environments.
PB Wiley
SN 0300-9483
SN 1502-3885
YR 2023
FD 2023-09-04
LK https://hdl.handle.net/20.500.14352/123382
UL https://hdl.handle.net/20.500.14352/123382
LA eng
NO Fernandes, M., Oliva, M., Fernández-Fernández, J.M., Vieira, G., Palacios, D., Garcia-Oteyza, J., Ventura, J., Schimmelpfennig, I. and ASTER Team (2024), Geomorphological record of the glacial to periglacial transition from the Bølling–Allerød to the Holocene in the Central Pyrenees: the Lòcampo cirque in the regional context. Boreas, 53: 71-87
NO Ministerio de Economía y Competitividad (España)
NO AGAUR - Generalitat de Catalunya (España)
NO Fundação para a Ciência e Tecnologia (Portugal)
NO Agence Nationale de la Recherche (Francia)
NO Institut National des Sciences de l'Univers (Francia)
NO Institut de Recherche pour le Développement (Francia)
DS Docta Complutense
RD 19 mar 2026