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

Heredia Barión, Pablo A.; Strelin, Jorge A.; Roberts, Stephen J.; Spiegel, Cornelia; Wacker, Lukas; Niedermann, Samuel; Bentley, Michael J.; Pearson, Emma J.; Manograsso Czalbowski, Nadia T.; Davies, Sarah J.; Schnetger, Bernhard; Grosjean, Martin; Arcusa, Stephanie; Perren, Bianca; Hocking, Emma P.; Kuhn, Gerhard (2023). 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. Frontiers in Earth Science, 10 Frontiers Media 10.3389/feart.2022.1073075

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The timing and impact of deglaciation and Holocene readvances on the
terrestrial continental margins of the Antarctic Peninsula (AP) have been
well-studied but are still debated. Potter Peninsula on King George Island
(KGI) (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 the 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 was 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 SSI and the northern AP and likely driven by interactions between
millennial–centennial-scale changes in solar insolation and irradiance, the
southern westerlies, and the Southern Annular Mode.

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