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Antarctic erosion history reconstructed by Terre Adélie moraine geochronology

Published online by Cambridge University Press:  08 July 2020

Encelyn Voisine ,
Yann Rolland Open the ORCID record for Yann Rolland [Opens in a new window] ,
Matthias Bernet ,
Julien Carcaillet ,
Guillaume Duclaux ,
Jérôme Bascou ,
Christian Sue ,
Mélanie Balvay  and
René-Pierre Ménot
Encelyn Voisine
Affiliation:
EDYTEM, Université de Savoie Mont-Blanc - CNRS, Le Bourget du Lac, France Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
Yann Rolland*
Affiliation:
EDYTEM, Université de Savoie Mont-Blanc - CNRS, Le Bourget du Lac, France Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
Matthias Bernet
Affiliation:
Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
Julien Carcaillet
Affiliation:
Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
Guillaume Duclaux
Affiliation:
Université Côte d'Azur, CNRS, Géoazur, 250 rue Albert Einstein, Sophia Antipolis, France
Jérôme Bascou
Affiliation:
Université de Lyon, Université Jean Monnet, Laboratoire Magmas et Volcans, Saint-Etienne, France
Christian Sue
Affiliation:
Chrono-environnement, Université de Bourgogne–Franche-Comté, Besançon, France
Mélanie Balvay
Affiliation:
Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
René-Pierre Ménot
Affiliation:
Université de Lyon, Université Jean Monnet, Laboratoire Magmas et Volcans, Saint-Etienne, France
*
[email protected]
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Abstract

We report apatite fission-track and 10Be terrestrial cosmogenic nuclide (TCN) dating of 14 moraine boulders originating from inland Terre Adélie, East Antarctica. These data show cooling of the Proterozoic Terre Adélie craton at < ~120°C between 350 and 300 Ma, suggesting > 4 km temperate glacial erosion during the Late Palaeozoic Ice Age, followed by nearly null Mesozoic erosion and low glacial erosion (< 2 km) in the Cenozoic. Based on glacial flux maps, the origin of the boulders may be located ~400 km upstream. Preliminary TCN (10Be) datings of moraine boulders cluster within the last 30 ka. Cosmogenic ages from the Lacroix Nunatak suggest a main deglaciation after the Younger Dryas at c. 10 ka, while those of Cap Prud'homme mostly cluster at 0.6 ka, in agreement with an exhumation of boulders during the Little Ice Age.

Keywords

cosmogenic nuclide datingdeglaciationexhumationfission-track datingLate Palaeozoic Ice Agesubglacial incision
Type
Earth Sciences
Information
Antarctic Science , Volume 32 , Issue 5 , October 2020 , pp. 382 - 395
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Copyright
Copyright © Antarctic Science Ltd 2020

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