Resolving the paradox of conflicting glacial chronologies: Reconstructing the pattern of deglaciation of the Magellan cordilleran ice dome (53–54°S) during the last glacial – interglacial transition

Citation

Mcculloch RD, Bentley MJ, Fabel D, Fernández-Navarro H, Garcia JL, Hein AS, Huynh C, Jamieson SSR, Lira M, Lüthgens C, Nield GA, San Román M & Tisdall EW (2024) Resolving the paradox of conflicting glacial chronologies: Reconstructing the pattern of deglaciation of the Magellan cordilleran ice dome (53–54°S) during the last glacial – interglacial transition. Quaternary Science Reviews, 344, Art. No.: 108866. https://doi.org/10.1016/j.quascirev.2024.108866

Abstract
Raised shorelines and associated lacustrine sediments in the central Estrecho de Magallanes (Strait of Magellan) have been interpreted as products of cordilleran glaciers impounding a large proglacial lake and preventing drainage to the South Pacific and Southern Ocean during the Late glacial between c. 15.0 and 12.0 cal ka BP. However, a growing body of glacial geological evidence points towards an earlier retreat of the Magellan cordilleran ice dome, insufficient to dam lakes at that time. We critically re-evaluate the extant evidence for the c. 15.0-12.0 cal ka BP lake, here named 'Lago Kawésqar', and provide further sedimentological and chronological evidence for its existence. We also provide new cosmogenic surface nuclide dating of erratic and bedrock samples collected

Keywords
Fuego-patagonia; Cosmogenic dating; OSL dating; Tephrochronology; Lake sediments; Glacial isostatic adjustment; Neotectonics

Journal
Quaternary Science Reviews: Volume 344