Publications des scientifiques de l'IRD

Angel I., Audemard M. F.A., Carcaillet J., Audin Laurence. (2016). Deglaciation chronology in the Mérida Andes from cosmogenic 10Be dating, (Gavidia valley, Venezuela). In : Audemard F. (ed.), Zahradník J. (ed.), Assumpção M. (ed.). Regional moment tensors and stress field in South and Central America. Journal of South American Earth Sciences, 71 (no spécial), p. 235-247. ISSN 0895-9811.

Titre du document
Deglaciation chronology in the Mérida Andes from cosmogenic 10Be dating, (Gavidia valley, Venezuela)
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000385322400017
Auteurs
Angel I., Audemard M. F.A., Carcaillet J., Audin Laurence
In
Audemard F. (ed.), Zahradník J. (ed.), Assumpção M. (ed.), Regional moment tensors and stress field in South and Central America
Source
Journal of South American Earth Sciences, 2016, 71 (no spécial), p. 235-247 ISSN 0895-9811
In the Mérida Andes, a detailed deglaciation history reconstruction is difficult to achieve due to scattered deglaciation chronologies available. This paper contributes with 24 exposure ages of glacial landforms sampled in the Gavidia valley. Exposure ages were obtained based on terrestrial cosmogenic nuclide 10Be dating. Results indicate deglaciation mainly occurred between In the Mérida Andes, a detailed deglaciation history reconstruction is difficult to achieve due to scattered deglaciation chronologies available. This paper contributes with 24 exposure ages of glacial landforms sampled in the Gavidia valley. Exposure ages were obtained based on terrestrial cosmogenic nuclide 10Be dating. Results indicate deglaciation mainly occurred between ~21 ka and 16.5 ka and the complete deglaciation occurred at ∼16.0 ka. The glacier retreated in two different phases. The oldest one occurred since the LGM until middle OtD or the local climate event El Caballo Stadial. The youngest phase occurred at ages younger than ~16.5 ka until complete deglaciation. A combination of topographic features and changes in the paleoclimate conditions at the end of the El Caballo Stadial seems leaded the fastest former glacier extinction. The topographic feature which seems contributed to the fastest glacier extinction was the low valley bottom slopes. In addition, exposure ages of the Gavidia valley were integrated with deglaciation chronologies from the central Mérida Andes to compare deglaciation histories. Asynchronous deglaciation histories were observed. Local paleotemperatures and paleoprecipitations contrasts, different valleys aspects, insolation and catchments steepness could explain different deglaciation histories ~21 ka and 16.5 ka and the complete deglaciation occurred at ~16.0 ka. The glacier retreated in two different phases. The oldest one occurred since the LGM until middle OtD or the local climate event El Caballo Stadial. The youngest phase occurred at ages younger than ~16.5 ka until complete deglaciation. A combination of topographic features and changes in the paleoclimate conditions at the end of the El Caballo Stadial seems leaded the fastest former glacier extinction. The topographic feature which seems contributed to the fastest glacier extinction was the low valley bottom slopes. In addition, exposure ages of the Gavidia valley were integrated with deglaciation chronologies from the central Mérida Andes to compare deglaciation histories. Asynchronous deglaciation histories were observed. Local paleotemperatures and paleoprecipitations contrasts, different valleys aspects, insolation and catchments steepness could explain different deglaciation histories.
Plan de classement
Géologie et formations superficielles [064]
Localisation
Fonds IRD [F B010067325]
Identifiant IRD
fdi:010067325
Contact