Antarctic erosion history reconstructed by Terre Adélie moraine geochronology. Issue 5 (October 2020)

• Record Type: Journal Article
• Authors: Voisine, Encelyn; Rolland, Yann; Bernet, Matthias; Carcaillet, Julien; Duclaux, Guillaume; Bascou, Jérôme; Sue, Christian; Balvay, Mélanie; Ménot, René-Pierre
• Is Part Of: Antarctic science. Volume 32:Issue 5(2020)
• Page Start: 382
• Page End: 395
• Publication Date: 2020-10
• Subjects: cosmogenic nuclide dating, -- deglaciation, -- exhumation, -- fission-track dating, -- Late Palaeozoic Ice Age, -- subglacial incision; Science -- Antarctica -- Periodicals; 509.989
• DOI: 10.1017/S095410202000036X
• Languages: English
• ISSNs: 0954-1020

Abstract

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.