Antarctic erosion history reconstructed by Terre Adélie moraine geochronology

Abstract We report apatite fission-track and 10 Be 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 temp...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Voisine, Encelyn, Rolland, Yann, Bernet, Matthias, Carcaillet, Julien, Duclaux, Guillaume, Bascou, Jérôme, Sue, Christian, Balvay, Mélanie, Ménot, René-Pierre
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2020
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarc*
Antarctic
Antarctic Science
Antarctica
East Antarctica
Online Access:http://dx.doi.org/10.1017/s095410202000036x
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410202000036X
Description
Summary:Abstract We report apatite fission-track and 10 Be 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 ( 10 Be) 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.

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