The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.3389/feart.2022.1073075. This is version 2 of this Preprint.

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Authors

Pablo Heredia Barión, Jorge A Strelin, Stephen J Roberts , Cornelia Spiegel, Lukas Wacker, Samuel Niedermann, Michael J Bentley, Emma J Pearson, Tamara Manograsso Czalbowski, Sarah J Davies, Bernhard Schnetger, Martin Grosjean, Stephanie Arcusa, Bianca Perren, Emma Hocking, Gerhard Kuhn

Abstract

The timing and impact of deglaciation and Holocene readvances on the terrestrial continental margins of the Antarctic Peninsula have been well-studied but are still debated. Potter Peninsula on King George Island (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula has a detailed assemblage of glacial landforms and stratigraphic exposures for constraining deglacial landscape development and glacier readvances. We undertook new morphostratigraphic mapping of the deglaciated foreland of the Warszawa Icefield, an outlet of the Bellingshausen (Collins) Ice Cap on Potter Peninsula, using satellite imagery and new lithofacies recognition and interpretations, combined with new chronostratigraphic analysis of stratigraphic sections, lake sediments, and moraine deposits. Results show that deglaciation on Potter Peninsula began before c. 8.2 ka. Around c. 7.0 ka, the Warszawa Icefield and the marine-facing Fourcade Glacier readvanced across Potter Peninsula and to the outer part of Potter Cove. Evidence of further readvances on Potter Peninsula is then absent until the Warszawa Icefield margin was landward of its present position on three occasions, c. 1.7–1.4 ka, after c. 0.7 ka (most likely c. 0.5–0.1 ka), and by 1956 CE. The timing of Holocene deglaciation and glacier fluctuations on Potter Peninsula are broadly coeval with other glacier- and ice-free areas on the South Shetland Islands and the northern Antarctic Peninsula, and likely driven by interactions between millennial-to-centennial-scale changes in solar insolation and irradiance, the southern westerlies, and the Southern Annular Mode.

DOI

https://doi.org/10.31223/X5606J

Subjects

Earth Sciences, Geology, Geomorphology, Glaciology, Physical Sciences and Mathematics, Sedimentology

Keywords

deglaciation, geomorphological mapping, radiocarbon dating, South Shetland Islands, stratigraphy

Dates

Published: 2022-10-19 10:37

Last Updated: 2022-12-17 16:40

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License

CC BY Attribution 4.0 International

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