Comment on: ‘The Last Glacial Maximum and deglaciation in southern South America’

Wenzens, Gerd

doi:10.1016/s0277-3791(02)00165-8

Cited by 12 publications

(11 citation statements)

References 12 publications

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“…Late-glacial moraines have been mapped enclosing the two branches of Lago San Martín and both shores of the central lake branch. They were interpreted as representing a third late-glacial readvance at c. 10.5-9.5 14 C ka BP (Wenzens, 2003). Further east, in the tableland region, several moraine arcs and spillway evidence have been mapped.…”

Section: The Southern Patagonian Palaeo-ice Lobesmentioning

confidence: 99%

“…Wenzens (2003) suggested that these lakes were part of the same glacial outlet flowing from Mt. San Lorenzo (3700 m a.s.l.…”

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

“…Four glacial limits have previously been recognized in this area (Coronato et al ., 2004a). Later, LGM moraines were defined surrounding Lago Tar and the southern coast of Lago San Martín (Wenzens, 2003, 2005). Radiocarbon dating on basal organic matter in a drainage channel between two moraine arcs indicated that the oldest late‐glacial advance occurred before 13.1 ka bp and the youngest occurred prior to 9.3 ka bp (Wenzens, 1999).…”

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

“…They were interpreted as representing a third late‐glacial readvance at c . 10.5–9.5 14 C ka bp (Wenzens, 2003). Further east, in the tableland region, several moraine arcs and spillway evidence have been mapped.…”

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

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Late Cenozoic glaciations in Patagonia and Tierra del Fuego: an updated review

Rabassa¹,

Coronato²,

Martı́nez³

2011

Biological Journal of the Linnean Society

205

155

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The Patagonian glaciations developed from the latest Miocene (c. 6 Ma) in multiple events of varied duration and intensity. Most of the present glacial landscape is the result of the glacial modelling during the Pleistocene, since the Great Patagonian Glaciation (GPG; c. 1 Ma). The Patagonian Andes were covered by a continuous mountain ice sheet, from 37°S to Cape Horn (56°S), in at least five major glaciations over more than 15 cold events over the last million years. Before GPG, the glaciers were restricted to isolated ice caps along the mountain ranges. The present drainage network was developed after the Last Glacial Maximum [LGM; c. 25 calibrated kiloyears before present (cal. ka BP)], particularly those cases with drainage reversal, when the glaciers began to melt as a result of global climatic changes. The environmental impact of glaciations extended not only all over Patagonia, but to the Pampas as well.Las glaciaciones patagónicas se desarrollaron desde el final del Mioceno (ca. 6 Ma) en múltiples eventos, de variada duración e intensidad. La mayoría del paisaje andino actual es el resultado del modelado glaciario durante el Pleistoceno, desde la Gran Glaciación Patagónica (GGP; ca. 1 Ma). Los Andes Patagónicos fueron cubiertos por un manto de hielo de montaña continuo, desde 37°S hasta el Cabo de Hornos (56°S) a lo largo de por lo menos 5 glaciaciones mayores durante más de 15 eventos fríos en el último millón de años. Antes de la GGP, los glaciares estaban restringidos a casquetes glaciarios aislados a lo largo de las cadenas montañosas. El sistema de redes de drenaje actual, en especial en lo que hace a la inversión del drenaje, se desarrolló luego del Último Máximo Glacial (UMG; ca. 25 cal. ka A.P.), cuando los glaciares comenzaron a retirarse debido a cambios climáticos globales. El impacto ambiental de las glaciaciones se extendió, no sólo a toda la Patagonia, sino también a la región pampeana.

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Section: The Southern Patagonian Palaeo-ice Lobesmentioning

confidence: 99%

“…Wenzens (2003) suggested that these lakes were part of the same glacial outlet flowing from Mt. San Lorenzo (3700 m a.s.l.…”

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

Section: The Southern Patagonian Palaeo‐ice Lobesmentioning

confidence: 99%

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Late Cenozoic glaciations in Patagonia and Tierra del Fuego: an updated review

Rabassa¹,

Coronato²,

Martı́nez³

2011

Biological Journal of the Linnean Society

205

155

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“…In this paper, we provide cosmogenic nuclide exposure age estimates for glacial landforms (moraines and former lake shorelines) in the Lago San Martin Valley in Argentina (49°S, 72°W), a major icedischarge route of the former Patagonian Ice Sheet. We also use these cosmogenic nuclide exposure age estimates to identify the spatial extent of the LGM in the valley, an important contribution given the considerable debate concerning the size of the LGM in Patagonia (Hulton et al, 2002;Wenzens, 2003).…”

Section: Introductionmentioning

confidence: 99%

Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina

et al. 2011

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Neil F. Glasser, Krister N. Jansson, Bradley W. Goodfellow, Hernan de Angelis, Helena Rodnight, Dylan H. Rood (2011). Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina. Quaternary Research, 75, 3, 636-646At several times during the Quaternary, a major eastward-flowing outlet glacier of the former Patagonian Ice Sheet occupied the Lago San Martin Valley in Argentina (49?S, 72?W). We present a glacial chronology for the valley based on geomorphological mapping and cosmogenic nuclide (10Be) exposure ages (n = 10) of boulders on moraines and lake shorelines. There are five prominent moraine belts in the Lago San Martin Valley, associated with extensive sandar (glaciofluvial outwash plains) and former lake shorelines. Cosmogenic nuclide exposure ages for boulders on these moraines indicate that they formed at 14.3 ? 1.7 ka, 22.4 ? 2.3 ka, 34.4 ? 3.4 ka to 37.6 ? 3.4 ka (and possibly 60 ? 3.5 ka), and 99 ? 11 ka (1?). These dated glacier advances differ from published chronologies from the Lago San Martin Valley based on 14C age determinations from organic sediments and molluscs in meltwater channels directly in front of moraines or in kettleholes within end moraine ridges. The moraine boulder ages also point to possible pre-LGM glacial advances during the last glacial cycle and a key observation from our data is that the LGM glaciers were probably less extensive in the Lago San Martin Valley than previously thought.Peer reviewe

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