Glacial geomorphology of the Strait of Magellan ice lobe, southernmost Patagonia, South America

Soteres, Rodrigo L.; Peltier, Carly; Kaplan, Michael R.; Sagredo, Esteban A.

doi:10.1080/17445647.2020.1736197

Cited by 20 publications

(5 citation statements)

References 55 publications

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“…Erratic boulders from the Cordillera Darwin have been found at Bahía Inútil, >100 km to the north (Evenson et al, 2009). These boulders have been termed "Darwin's boulders" and their association with glacial landforms dating to the last glacial maximum (LGM; 26.5-19 ka; Clark et al, 2009) implies the existence of an extensive, conjoined ice sheet at this time that extended from the Cordillera Darwin to the upper Strait of Magellan (Rabassa et al, 2000;McCulloch et al, 2005b;Kaplan et al, 2007;Evenson et al, 2009;Darvill et al, 2014Darvill et al, , 2015Soteres et al, 2020;Peltier et al, 2021;Fig. 1).…”

Section: Regional Paleoglacier Chronologiesmentioning

confidence: 99%

Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

et al. 2021

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In the Cordillera Darwin, southernmost South America, we used 10Be and 14C dating, dendrochronology, and historical observations to reconstruct the glacial history of the Dalla Vedova valley from deglacial time to the present. After deglacial recession into northeastern Darwin and Dalla Vedova, by ~16 ka, evidence indicates a glacial advance at ~13 ka coeval with the Antarctic Cold Reversal. The next robustly dated glacial expansion occurred at 870 ± 60 calendar yr ago (approximately AD 1150), followed by less-extensive dendrochronologically constrained advances from shortly before AD 1836 to the mid-twentieth century. Our record is consistent with most studies within the Cordillera Darwin that show that the Holocene glacial maximum occurred during the last millennium. This pattern contrasts with the extensive early- and mid-Holocene glacier expansions farther north in Patagonia; furthermore, an advance at 870 ± 60 yr ago may suggest out-of-phase glacial advances occurred within the Cordillera Darwin relative to Patagonia. We speculate that a southward shift of westerlies and associated climate regimes toward the southernmost tip of the continent, about 900–800 yr ago, provides a mechanism by which some glaciers advanced in the Cordillera Darwin during what is generally considered a warm and dry period to the north in Patagonia.

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Section: Regional Paleoglacier Chronologiesmentioning

confidence: 99%

Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

et al. 2021

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“…We grouped together local geomorphological features according to their morphogenetic nature in glacial, periglacial, mass movement, fluvial and lacustrine landform assemblages. Individual landforms are summarized in Table 1, adapting the scheme presented in Darvill et al (2014), Bendle et al (2017) and Soteres, Peltier, et al (2020).…”

Section: Resultsmentioning

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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“…We assessed glacial landsystems by performing sedimentary and stratigraphic loggings around the major landforms, and then manually digitized the geomorphological features using ArcMap 10.5 and QGIS, where we created both polygons and polylines to delineate the landforms. We followed previously published criteria (Cooper et al, 2021;Leger et al, 2020;Mendelová et al, 2020;Peltier et al, 2023;Soteres et al, 2020Soteres et al, , 2022, and we classified these features based on their primary depositional environment as ice marginal (e.g., moraines, hummocks), subglacial (e.g., glacial lineations, drumlins), glaciofluvial (e.g., outwash plains), glaciolacustrine, and other non-glacial features (such as modern hydrography). Lastly, we used built-in geospatial tools to derive the count, length, and orientation of the mapped topographic features.…”

Section: Geomorphological Mappingmentioning

confidence: 99%

“…We defined drumlinized terrains as diffused areas that contain linear features indicative of ice flow direction (Soteres et al, 2020). We identified and mapped over 600 subglacial features, including drumlins (linear depositional landforms with oval or ellipsoidal shapes) and glacial lineations (linear and narrow depositional landforms) inboard the main moraine complexes…”

Section: Subglacial Features 185mentioning

confidence: 99%

“…We identified outwash plains as extensive low-gradient proglacial surfaces composed of sands and rounded gravels (Soteres et al, 2020), and associated them with their corresponding moraine complexes, following the framework established by in Strelin and Malagnino (1996). While the Arroyo Verde glaciofluvials are located at eastern sites and at higher elevations, the El Tranquilo outwash plains are widespread in the center of the valley at elevations between 180 -200 m with low-gradient slopes (∼0.3 to 1 %).…”

Section: Glaciofluvial Featuresmentioning

confidence: 99%

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Late Quaternary glacial maxima in Southern Patagonia: insights from the Lago Argentino glacier lobe

Romero,

Penprase,

Van Wyk de Vries

et al. 2024

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Abstract. Determining the timing and extent of Quaternary glaciations around the globe is critical to understanding the drivers behind climate change and glacier fluctuations. Despite synchronous ice-volume and extent change across hemispheres, evidence from the southern mid-latitudes indicates that local glacial maxima occurred earlier in the glacial cycle, preceding the global Last Glacial Maximum (LGM), implying that feedbacks in the climate system or ice dynamics played a role beyond the underlying orbital parameters. To shed light on these processes, we investigated the glacial landforms shaped by the Lago Argentino glacier (50° S), an outlet lobe of the former Patagonian Ice Sheet in southern Argentina, during the last two glacial cycles. We mapped geomorphological features on the landscape and dated moraine boulders and outwash sediments using 10Be cosmogenic nuclides and feldspar infrared stimulated luminescence (IRSL) to constrain the chronology of glacial advance and retreat. We, therefore, provide the first published age constraints on the middle-to-late Pleistocene glaciations at Lago Argentino, and report that this outlet lobe expanded during Marine Isotope Stage 6, at 153.0 ± 14.7 ka, and during Marine Isotope Stage 3, culminating at 44.5 ± 8.0 ka and at 36.6 ± 1.0 ka. Our results indicate that the most recent was its most extensive advance during the last glacial period, and hypothesize that this was a result of longer and colder winters, as well as increased precipitation delivered by a northward migration of the Southern Westerly Winds belt, highlighting the role of local and regional climate feedbacks in driving ice mass changes in the southern mid-latitudes.

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Glacial geomorphology of the Strait of Magellan ice lobe, southernmost Patagonia, South America

Cited by 20 publications

References 55 publications

Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

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

Late Quaternary glacial maxima in Southern Patagonia: insights from the Lago Argentino glacier lobe

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