Robert D. McCulloch
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
McCulloch, Robert D.; Bentley, Michael J.; Fabel, Derek; Fernández-Navarro, Hans; García, Juan-Luis; Hein, Andrew S.; Huynh, Carla; Jamieson, Stewart S.R.; Lira, María-Paz; Lüthgens, Christopher; Nield, Grace A.; San Román, Manuel; Tisdall, Eileen W.
Authors
Professor Michael Bentley m.j.bentley@durham.ac.uk
Professor
Derek Fabel
Hans Fernández-Navarro
Juan-Luis García
Andrew S. Hein
Carla Huynh
Professor Stewart Jamieson stewart.jamieson@durham.ac.uk
Professor
Maria Lira Bahamonde maria.p.lira-bahamonde@durham.ac.uk
Combined Role
Christopher Lüthgens
Dr Grace Nield grace.a.nield@durham.ac.uk
Assistant Professor
Manuel San Román
Eileen W. Tisdall
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 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 Kawésqar 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.
Citation
McCulloch, R. D., Bentley, M. J., Fabel, D., Fernández-Navarro, H., García, J.-L., Hein, A. S., Huynh, C., Jamieson, S. S., Lira, M.-P., Lüthgens, C., Nield, G. A., San Román, M., & Tisdall, E. W. (online). 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, Article 108866. https://doi.org/10.1016/j.quascirev.2024.108866
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 28, 2024 |
Online Publication Date | Sep 6, 2024 |
Deposit Date | Sep 10, 2024 |
Publicly Available Date | Sep 10, 2024 |
Journal | Quaternary Science Reviews |
Print ISSN | 0277-3791 |
Electronic ISSN | 1873-457X |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Article Number | 108866 |
DOI | https://doi.org/10.1016/j.quascirev.2024.108866 |
Public URL | https://durham-repository.worktribe.com/output/2853028 |
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Licence
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
This accepted manuscript is licensed under the Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/
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