气候变化领域集成服务门户(CCPortal): Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe; Santa Cruz province; Argentina

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DOI	10.1016/j.quascirev.2019.105992
	Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe; Santa Cruz province; Argentina
	Clague J.J.; Barendregt R.W.; Menounos B.; Roberts N.J.; Rabassa J.; Martinez O.; Ercolano B.; Corbella H.; Hemming S.R.
发表日期	2020
ISSN	0277-3791
卷号	227
英文摘要	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. © 2019 The Authors
英文关键词	Argentina; Cenozoic; Geomorphology; Glaciation; Landscape evolution; Paleomagnetism; Patagonia; Radiogenic isotopes; South America
语种	英语
scopus关键词	Basalt; Geomagnetism; Geomorphology; Isotopes; Landforms; Magnetic polarity; Topography; Argentina; Cenozoic; Glaciation; Landscape evolutions; Paleomagnetism; Patagonia; Radiogenic isotopes; South America; Glacial geology; Cenozoic; geomorphology; glaciation; landscape evolution; marine isotope stage; piedmont; Pleistocene; Pliocene-Pleistocene boundary; steppe; Andes; Argentina; Argentino Lake; Argentino Lake; Patagonia; Santa Cruz [Argentina]
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151657
作者单位	Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada; Department of Geography, University of Lethbridge, 4401 University Drive, Lethbridge, AB T1K 3M4, Canada; Geography Program and Natural Resources and Environmental Studies Institute, University of Northern British Columbia, 3333 University Way, Prince George, BC V2N 4Z9, Canada; Mineral Resources Tasmania, Department of State Growth, 30 Gordons Hill Road, PO Box 56, Rosny Park TAS7018, Australia; CADIC-CONICET, Bernardo Houssay # 200, Ushuaia, Tierra del Fuego 9410, Argentina; Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, Sarmiento 849, Esquel, Chubut, Argentina; Instituto Ciencias del Ambiente Sustentabilidad y Recursos Naturales, Universidad Nacional de Tierra del Fuego, Avenida Gobernador Gregores y Piloto “Lero” Rivera, Río Gallegos, 9400, Argentina; Museo Argentino de Ciencias Naturales CONICET, Avenida Ángel Gallardo 490, Buenos Aires, Argentina; Earth...
推荐引用方式 GB/T 7714	Clague J.J.,Barendregt R.W.,Menounos B.,et al. Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe; Santa Cruz province; Argentina[J],2020,227.
APA	Clague J.J..,Barendregt R.W..,Menounos B..,Roberts N.J..,Rabassa J..,...&Hemming S.R..(2020).Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe; Santa Cruz province; Argentina.Quaternary Science Reviews,227.
MLA	Clague J.J.,et al."Pliocene and Early Pleistocene glaciation and landscape evolution on the Patagonian Steppe; Santa Cruz province; Argentina".Quaternary Science Reviews 227(2020).