The glacial geomorphology of the Río Corcovado, Río Huemul and Lago Palena/General Vintter valleys, northeastern Patagonia (43°S, 71°W)

Leger, Tancrède; Hein, Andrew S.; Bingham, Robert G.; Martini, Mateo A.; Soteres, Rodrigo L.; Sagredo, Esteban A.; Martı́nez, O. E.

doi:10.1080/17445647.2020.1794990

Cited by 25 publications

(55 citation statements)

References 63 publications

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“…Characteristic landform features are terrace edges. Barrell et al (2011), Darvill et al (2014, Bendle et al (2017), Leger et al (2020) Alluvial plain As for outwash, but where the water source was mainly from non-glaciated catchments. Barrell et al (2011) Alluvial fan Sub-horizontal fans on valley sides and on distal parts of the outwash plains, often fed by meltwater channels or streams.…”

Section: Moraine Landform Featuresmentioning

confidence: 99%

Glacial geomorphology of the Ahuriri River valley, central Southern Alps, New Zealand

et al. 2021

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Detailed geomorphological mapping of ice-related and post-glacial landforms is widely used to explain past glacial fluctuations and dynamics. Here we present the first detailed glacial geomorphological description of the landform assemblages produced by the former Ahuriri Glacier, Southern Alps, New Zealand (44°15 ′ S, 169°36 ′ E). The Southern Alps of New Zealand experienced multiple episodes of glaciation during the Late Quaternary with large mountain glaciers in many valleys, but very little is known about the Ahuriri River valley, one of the main tributaries of the Waitaki River. We selected a region extending approximately 45 km downstream from the headwaters of the Ahuriri River covering an area of about 532 km 2 . Our goal was to create a detailed 1:38,000 scale glacial geomorphological map of this area and provide a geomorphological context to support future geochronological work. Glacial geomorphological mapping was performed by combining several field investigations and remote sensing surveys. We provided high-resolution spatial information for all the glacial-related landforms shown on the map (see main Map). The distribution of post-glacial landforms in the middle and lower section of the main valley outline at least three advances or stillstand phases of past glaciers and suggesting the maximum length (∼41 km) of the former glacier during the Last Glacial Maximum. Most of the tributary valleys were also probably covered by ice at this time. Other prominent but smaller size moraine landforms, mostly in the tributary river valleys, also suggest relatively small, post-glacial advance phases of former glaciers.

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Section: Moraine Landform Featuresmentioning

confidence: 99%

Glacial geomorphology of the Ahuriri River valley, central Southern Alps, New Zealand

et al. 2021

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“…Consequently, the eastern valleys of the Poncho Moro massif are located at the western edge of the semi-arid Patagonian steppe climate zone (Garreaud et al, 2013;Fick and Hijmans, 2017). The massif is delineated to the north and east by the Río Corcovado valley, formerly host to a major topographically-controlled outlet glacier (Río Corcovado glacier) of the Patagonian Ice Sheet (PIS), which flowed eastwards from the ice-sheet divide during major Quaternary glaciations (Caldenius, 1932;Haller et al,2003;Martínez et al, 2011;Leger et al, 2020). To the southeast of the Poncho Moro massif, the former Río Corcovado outlet glacier deposited a series of at least eight distinct moraine complexes (RC 0-VII) preserved across large expanses of the Argentinian foreland, five of which (RC III-VII) mark the local LGM and have been dated to marine isotope stage 2 (Leger et al, 2021).…”

Section: Study Locationmentioning

confidence: 99%

“…In areas with dense vegetation and/or cloud cover, we undertook different colour-rendering comparisons using 10 m resolution Sentinel 2A true colour (TCI) and false colour (bands 8,4,3) products (available from https://scihub.copernicus.eu/). Detailed geomorphological mapping criteria along with the complete geomorphological map of the area are presented by Leger et al (2020). Field-based mapping, ground-truthing and corrections of preliminary landform interpretations in the EL valley were conducted during the austral summer of 2020.…”

Section: Geomorphological Mappingmentioning

confidence: 99%

“…We focus our investigation on the El Loro and Río Comisario valleys, two adjacent glaciated mountain valleys of the Poncho Moro massif (Figure 1). Both valleys display geomorphological evidence of glacier expansion following the retreat of the Río Corcovado glacier, a major former outlet of the PIS (Leger et al, 2020;. We combine geomorphological mapping and 10 Be terrestrial cosmogenic nuclide (TCN) dating of moraine boulders to reconstruct the extent and timing of these glacier advances/still-stands, and employ a spatially-distributed ice-flow model coupled with a positive degree-day surface mass balance parameterisation to evaluate possible climatic conditions at the time of glacier resurgence.…”

Section: Introductionmentioning

confidence: 99%

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Northeastern Patagonian Glacier Advances (43°S) Reflect Northward Migration of the Southern Westerlies Towards the End of the Last Glaciation

et al. 2021

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The last glacial termination was a key event during Earth’s Quaternary history that was associated with rapid, high-magnitude environmental and climatic change. Identifying its trigger mechanisms is critical for understanding Earth’s modern climate system over millennial timescales. It has been proposed that latitudinal shifts of the Southern Hemisphere Westerly Wind belt and the coupled Subtropical Front are important components of the changes leading to global deglaciation, making them essential to investigate and reconstruct empirically. The Patagonian Andes are part of the only continental landmass that fully intersects the Southern Westerly Winds, and thus present an opportunity to study their former latitudinal migrations through time and to constrain southern mid-latitude palaeo-climates. Here we use a combination of geomorphological mapping, terrestrial cosmogenic nuclide exposure dating and glacial numerical modelling to reconstruct the late-Last Glacial Maximum (LGM) behaviour and surface mass balance of two mountain glaciers of northeastern Patagonia (43°S, 71°W), the El Loro and Río Comisario palaeo-glaciers. In both valleys, we find geomorphological evidence of glacier advances that occurred after the retreat of the main ice-sheet outlet glacier from its LGM margins. We date the outermost moraine in the El Loro valley to 18.0 ± 1.15 ka. Moreover, a series of moraine-matching simulations were run for both glaciers using a spatially-distributed ice-flow model coupled with a positive degree-day surface mass balance parameterisation. Following a correction for cumulative local surface uplift resulting from glacial isostatic adjustment since ∼18 ka, which we estimate to be ∼130 m, the glacier model suggests that regional mean annual temperatures were between 1.9 and 2.8°C lower than present at around 18.0 ± 1.15 ka, while precipitation was between ∼50 and ∼380% higher than today. Our findings support the proposed equatorward migration of the precipitation-bearing Southern Westerly Wind belt towards the end of the LGM, between ∼19.5 and ∼18 ka, which caused more humid conditions towards the eastern margins of the northern Patagonian Ice Sheet a few centuries ahead of widespread deglaciation across the cordillera.

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“…On the other hand, both the methodology and the representation techniques used to prepare this cartography follow the most current trends for the elaboration of detailed geomorphological cartographies in glacial areas (see e.g. Campos et al, 2018;Leger et al, 2020;Lindholm & Heyman, 2016;Zasadni & Kłapyta, 2014).…”

Section: Introductionmentioning

confidence: 99%

Glacial geomorphology of the High Gredos Massif: Gredos and Pinar valleys (Iberian Central System, Spain)

et al. 2020

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We present a detailed geomorphological map of the landform assemblages originated by the two major paleoglaciers of the Sierra de Gredos mountain range in the Spanish Iberian Central System. Based on previous works, our map focused on the features formed by Gredos and Pinar paleoglaciers during the last glaciation and subsequent glacial events. Based on a remote sensing analysis and exhaustive field surveys, we identified with great accuracy the local distribution of glacial, periglacial, mass movement, structural, fluvial, and lacustrine features. We recognized three main glacial geomorphological formations representing: (i) the maximum glacial extension reached (peripheral deposits); (ii) the culmination of glacial conditions (principal moraines) and (iii) the local glacial withdrawal (internal deposits). Our map offers a renewed spatial framework on which to conduct higher-resolution glacial chronologies, especially of Late Glacial and Holocene glacial activity, providing key information for performing future paleoclimatic reconstructions of the northern hemisphere mid-latitudes.

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The glacial geomorphology of the Río Corcovado, Río Huemul and Lago Palena/General Vintter valleys, northeastern Patagonia (43°S, 71°W)

Cited by 25 publications

References 63 publications

Glacial geomorphology of the Ahuriri River valley, central Southern Alps, New Zealand

Glacial geomorphology of the Ahuriri River valley, central Southern Alps, New Zealand

Northeastern Patagonian Glacier Advances (43°S) Reflect Northward Migration of the Southern Westerlies Towards the End of the Last Glaciation

Glacial geomorphology of the High Gredos Massif: Gredos and Pinar valleys (Iberian Central System, Spain)

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