Video1_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.MP4

• Main Authors: Pablo A. Heredia Barión (14324949), Jorge A. Strelin (14324952), Stephen J. Roberts (7191008), Cornelia Spiegel (7191752), Lukas Wacker (1839529), Samuel Niedermann (10575848), Michael J. Bentley (7190996), Emma J. Pearson (14324955), Nadia T. Manograsso Czalbowski (14324958), Sarah J. Davies (4398856), Bernhard Schnetger (591747), Martin Grosjean (2880893), Stephanie Arcusa (13033330), Bianca Perren (6978908), Emma P. Hocking (7190990), Gerhard Kuhn (4276459)
• Format: Dataset
• Language: unknown
• Published: 2023
• Subjects: Solid Earth Sciences; Climate Science; Atmospheric Sciences not elsewhere classified; Exploration Geochemistry; Inorganic Geochemistry; Isotope Geochemistry; Organic Geochemistry; Geochemistry not elsewhere classified; Igneous and Metamorphic Petrology; Ore Deposit Petrology; Palaeontology (incl. Palynology); Structural Geology; Tectonics; Volcanology; Geology not elsewhere classified; Seismology and Seismic Exploration; Glaciology; Hydrogeology; Natural Hazards; Quaternary Environments; Earth Sciences not elsewhere classified; Evolutionary Impacts of Climate Change; deglaciation; geomorphological mapping; radiocarbon dating; South Shetland islands; stratigraphy; glacier readvance; 25 de Mayo; Antarctic; Antarctic Peninsula; Fourcade; Fourcade Glacier; isla 25 de Mayo; King George Island; Potter Cove; Potter Peninsula; South Shetland Islands; The Antarctic; Warszawa Icefield; Antarc*; Ice cap; Isla 25 de Mayo
• Online Access: https://doi.org/10.3389/feart.2022.1073075.s002

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.