Show simple item record Clague, John J. Barendregt, René W. Menounos, Brian Roberts, Nicholas J. Rabassa, Jorge Martinez, Oscar Ercolano, Bettina Corbella, Hugo Hemming, Sidney R. 2021-09-16T23:46:37Z 2021-09-16T23:46:37Z 2020
dc.identifier.citation Clague, J. J., Barendregt. R. W., Menounos, B., Roberts, N. J., Rabassa, J., Martinez, O., Ercolano, B., Corbella, H., & Hemming, S. R. (2020). Pliocene and Early Pleistocne glaciation and landscape evolution on the Patagonian Steppe, Santa Cruz province, Argentina. Quaternary Science Reviews, 227(1), Article 105992. en_US
dc.description Open access article. Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0) applies en_US
dc.description.abstract At least seven late Pliocene tills cap plateaus (mesetas) south of Lago Viedma, just east of the Andes in Argentine Patagonia. Chronologic constraints on the tills are provided by 40Ar/39Ar ages and magnetic polarities on associated basalt flows and sediments. The tills were deposited by piedmont glaciers that reached at least 80 km east of the crest of the Andes and flowed on a low-relief surface sloping gently downward in that direction. The oldest of the tills is about 3.6 Ma old. Glacial deposits dating to the Pliocene-Pleistocene transition are present at least 40 km beyond the east limit of the Pliocene tills at Lago Viedma, and tills of similar age occur at Condor Cliff in the Río Santa Cruz valley to the southeast. A sequence of at least seven Early Pleistocene (2.1–1.1 Ma) tills is present between basalt flows in the Cerro del Fraile meseta south of Lago Argentino. The glaciers that deposited these Early Pleistocene tills reached far beyond the Marine Isotope Stage 2 limit in the Río Santa Cruz valley. Based on positions, extents, and ages of the un-deformed, basalt-capped mesetas flanking Lago Viedma, we conclude that the topography in this area was profoundly changed during the Pleistocene – the low to moderate relief Pliocene surface was deeply incised by glaciers that became increasingly confined to, and flowed within, troughs. The valley floors today are up to 1350 m below the late Pliocene surface. en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Glaciation en_US
dc.subject Cenozoic en_US
dc.subject Landscape evolution en_US
dc.subject Radiogenic isotopes en_US
dc.subject Pliocene
dc.subject Early Pleistocene
dc.subject Patagonia Steppe
dc.subject Glacial deposits
dc.subject.lcsh Geomorphology
dc.subject.lcsh Geology, Stratigraphic--Pliocene
dc.subject.lcsh Geology, Stratigraphic--Pleistocene
dc.title Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe, Santa Cruz province, Argentina en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Geography en_US
dc.description.peer-review Yes en_US
dc.publisher.institution Simon Fraser University en_US
dc.publisher.institution University of Lethbridge en_US
dc.publisher.institution University of Northern British Columbia en_US
dc.publisher.institution Mineral Resources Tasmania en_US
dc.publisher.institution CADIC-CONICET en_US
dc.publisher.institution Universidad Nacional de la Patagonia San Juan Bosco en_US
dc.publisher.institution Universidad Nacional de Tierra del Fuego en_US
dc.publisher.institution Museo Argentino de Ciencias Naturales CONICET en_US
dc.publisher.institution Columbia University en_US
dc.publisher.url en_US

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