Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe, Santa Cruz province, Argentina

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dc.contributor.authorClague, John J.
dc.contributor.authorBarendregt, René W.
dc.contributor.authorMenounos, Brian
dc.contributor.authorRoberts, Nicholas J.
dc.contributor.authorRabassa, Jorge
dc.contributor.authorMartinez, Oscar
dc.contributor.authorErcolano, Bettina
dc.contributor.authorCorbella, Hugo
dc.contributor.authorHemming, Sidney R.
dc.date.accessioned2021-09-16T23:46:37Z
dc.date.available2021-09-16T23:46:37Z
dc.date.issued2020
dc.descriptionOpen access article. Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0) appliesen_US
dc.description.abstractAt 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.description.peer-reviewYesen_US
dc.identifier.citationClague, 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. https://doi.org/10.1016/j.quascirev.2019.105992en_US
dc.identifier.urihttps://hdl.handle.net/10133/6028
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.publisher.departmentDepartment of Geographyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionSimon Fraser Universityen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionUniversity of Northern British Columbiaen_US
dc.publisher.institutionMineral Resources Tasmaniaen_US
dc.publisher.institutionCADIC-CONICETen_US
dc.publisher.institutionUniversidad Nacional de la Patagonia San Juan Boscoen_US
dc.publisher.institutionUniversidad Nacional de Tierra del Fuegoen_US
dc.publisher.institutionMuseo Argentino de Ciencias Naturales CONICETen_US
dc.publisher.institutionColumbia Universityen_US
dc.publisher.urlhttps://doi.org/10.1016/j.quascirev.2019.105992en_US
dc.subjectGlaciationen_US
dc.subjectCenozoicen_US
dc.subjectLandscape evolutionen_US
dc.subjectRadiogenic isotopesen_US
dc.subjectPliocene
dc.subjectEarly Pleistocene
dc.subjectPatagonia Steppe
dc.subjectGlacial deposits
dc.subject.lcshGeomorphology
dc.subject.lcshGeology, Stratigraphic--Pliocene
dc.subject.lcshGeology, Stratigraphic--Pleistocene
dc.titlePliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe, Santa Cruz province, Argentinaen_US
dc.typeArticleen_US
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