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

• Published in: Journal of Maps
• Main Authors: Soteres, Rodrigo, Peltier, Carly, Kaplan, Michael, Sagredo, Esteban
• Other Authors: Pontificia Universidad Católica de Chile (UC), Lamont-Doherty Earth Observatory (LDEO), Columbia University New York, National Ph.D. Fellowship CONICYT #21161417 (Soteres)FONDECYT #1160488 (Sagredo)ANID Millennium Science Initiative/“Millennium Nucleus Paleoclimate” (Soteres & Sagredo)National Sciences Foundation NSF-BCS 1263474 (Kaplan)Fulbright Commission Visiting Scholar Grant (Kaplan), ANR-11-LABX-0010,DRIIHM / IRDHEI,Dispositif de recherche interdisciplinaire sur les Interactions Hommes-Milieux(2011)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: glacial geomorphology; last glacial maximum; Strait of Magellan; Surface exposure dating; Patagonia; OHMi Bahia exploradores; [SDE]Environmental Sciences; Ice Sheet
• Online Access: https://hal.science/hal-03677371; https://doi.org/10.1080/17445647.2020.1736197

International audience We present a geomorphic map of the landforms created by the Patagonian Ice Sheet during the local Last Glacial Maximum and perhaps prior glaciations in southernmost Patagonia. Building on prior work, the new mapping focuses in unprecedented detail on the right lateral and frontal landforms formed by the Strait of Magellan ice lobe. We produced the map using aerial orthophotography, Sentinel-2 and SPOT satellite imagery, ALOS PALSAR digital elevation model and fieldwork to ground-truth preliminary interpretations. We delineate at least five glacial events defined by a sequence of moraine drifts and associated glaciofluvial features. In contrast to previous studies, we propose the Magellan ice lobe extended ∼65 km farther, to the Primera Angostura peninsula, during the local Last Glacial Maximum. Our study provides a new context to establish a precise glacial chronology of the Magellan ice lobe during the last glacial cycle in the middle-high latitudes of the Southern Hemisphere.