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

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dc.contributor.authorMcculloch, Robert D.
dc.contributor.authorBentley, Michael J.
dc.contributor.authorFabel, Derek
dc.contributor.authorFernandez-Navarro, Hans
dc.contributor.authorGarcia, Juan-Luis
dc.contributor.authorHein, Andrew S.
dc.contributor.authorHuynh, Carla
dc.contributor.authorJamieson, Stewart S. R.
dc.contributor.authorLira, Maria-Paz
dc.contributor.authorLuethgens, Christopher
dc.contributor.authorNield, Grace A.
dc.contributor.authorRoman, Manuel San
dc.contributor.authorTisdall, Eileen W.
dc.date.accessioned2025-01-20T16:04:25Z
dc.date.available2025-01-20T16:04:25Z
dc.date.issued2024
dc.description.abstractRaised 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 Kawe<acute accent>sqar', and provide further sedimentological and chronological evidence for its existence. We also provide new cosmogenic surface nuclide dating of erratic and bedrock samples collected from extensive field campaigns that confirm the rapid and widespread retreat of the Magellan ice fields to the inner fjords of the Fuegian archipelago by c. 16.0 ka. To resolve the apparent paradox between these two lines of evidence we propose that glacial isostatic adjustment led to a topographic barrier to lake drainage rather than an ice dam. We use Glacial Isostatic Adjustment modelling to demonstrate that rapid isostatic recovery following the early deglaciation after c. 17.0 cal ka BP likely led to elevation of the present shallow south-western coastal margin of the Fuegian archipelago. Final drainage of Lago Kawe<acute accent>sqar was probably caused by neotectonic subsidence of the same margin along the boundary of the South American - Scotia tectonic plates at c. 12.0 cal ka BP.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.quascirev.2024.108866
dc.identifier.eissn1873-457X
dc.identifier.issn0277-3791
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2024.108866
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89750
dc.identifier.wosidWOS:001357054300001
dc.language.isoen
dc.revistaQuaternary science reviews
dc.rightsacceso restringido
dc.subjectFuego-patagonia
dc.subjectCosmogenic dating
dc.subjectOSL dating
dc.subjectTephrochronology
dc.subjectLake sediments
dc.subjectGlacial isostatic adjustment
dc.subjectNeotectonics
dc.titleResolving 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
dc.typeartículo
dc.volumen344
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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