Garcia-Ruiz J. M., Palacios D., Fernandez-Fernandez J. M., Andres N., Arnaez J., Gomez-Villar A., Santos-Gonzalez J., Alvarez-Martinez J., Lana-Renault N., Leanni Laetitia, Aster Team. (2020). Glacial stages in the Pena Negra valley, Iberian Range, northern Iberian Peninsula : assessing the importance of the glacial record in small cirques in a marginal mountain area. Geomorphology, 362, art. 107195 [13 p.]. ISSN 0169-555X.
Titre du document
Glacial stages in the Pena Negra valley, Iberian Range, northern Iberian Peninsula : assessing the importance of the glacial record in small cirques in a marginal mountain area
Année de publication
2020
Auteurs
Garcia-Ruiz J. M., Palacios D., Fernandez-Fernandez J. M., Andres N., Arnaez J., Gomez-Villar A., Santos-Gonzalez J., Alvarez-Martinez J., Lana-Renault N., Leanni Laetitia, Aster Team
Source
Geomorphology, 2020,
362, art. 107195 [13 p.] ISSN 0169-555X
The objective of this study was to assess whether it is possible to obtain a comprehensive record of the last deglaciation from the small Pena Negra glacial cirque in a marginal mountain range in the Iberian Range (northern Iberian Peninsula). Tire cirque is located in Sierra Cebollera, at an elevation slightly over 2000 m a.s.l. in the divide, and has relatively low elevational difference between its uppermost and lowest parts. The Pena Negra glacial cirque was selected because of the presence of several lateral moraines indicating the occurrence of a glacial longue of 1.8 km length and a small rock glacier, enabling identification of the main glacial stages that affected the paleo-evolulion of the glacier. Using cosmogenic exposure dating techniques and geomorphological mapping it was possible to reconstruct the historical Pena Negra glacier and to distinguish: (i) the maximum ice extent (MIE) at approximately 18-20 ka, coinciding with the Global Last Glacial Maximum (GLGM), although the occurrence of a previous stage was not ruled out; (ii) a stage of glacial re-advance at 16-17 ka, coinciding with the Oldest Dry as, followed by rapid ice melting; (iii) the development of a rock glacier in a minor structural cirque near the headwall at 14-15 ka, when paraglacial processes were probably dominant; and (iv) evidence of ice melting in the uppermost cirque at 13.5 ka. Study of the Pena Negra glacier revealed the history of a minor valley glacier affected by distinct stages, including the formation of a small rock glacier in the final phases of deglaciation. No evidence of a Younger Diyas re-advance was found.
Plan de classement
Sciences du milieu [021]
;
Hydrologie [062]
;
Géologie et formations superficielles [064]
Description Géographique
ESPAGNE
Localisation
Fonds IRD [F B010078152]
Identifiant IRD
fdi:010078152
