Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula

To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began...

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Bibliographic Details
Published in:Holocene (Sevenoaks) 2023-06, Vol.33 (6), p.636-658
Main Authors: Heredia Barión, Pablo, Roberts, Stephen J, Spiegel, Cornelia, Binnie, Steven A, Wacker, Lukas, Davies, Joanna, Gabriel, Imogen, Jones, Vivienne J, Blockley, Simon, Pearson, Emma J, Foster, Louise, Davies, Sarah J, Roland, Thomas P, Hocking, Emma P, Bentley, Michael J, Hodgson, Dominic A, Hayward, Chris L, McCulloch, Robert D, Strelin, Jorge A, Kuhn, Gerhard
Format: Article
Language:English
Subjects:
Deglaciation
Freshwater
Freshwater lakes
Glaciers
Holocene
Ice caps
Inland water environment
Islands
Lakes
Meltwater
Mosses
Polar environments
Probability theory
Storms
Westerlies
Winds
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Summary:To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began after c. 15 cal. ka BP and had progressed to within present-day limits on the Fildes Peninsula, its largest ice-free peninsula, by c. 6.6–5.3 cal. ka BP. Probability density phase analysis of chronological data constraining Holocene glacier advances on KGI revealed up to eight 95% probability ‘gaps’ during which readvances could have occurred. These are grouped into four stages – Stage 1: a readvance and marine transgression, well-constrained by field data, between c. 7.4 and 6.6 cal. ka BP; Stage 2: four probability ‘gaps’, less well-constrained by field data, between c. 5.3 and 2.2 cal. ka BP; Stage 3: a well-constrained but restricted ‘readvance’ between c. 1.7 and 1.5 cal. ka BP; Stage 4: two further minor ‘readvances’, one less well-constrained by field data between c. 1.3 and 0.7 cal. ka BP (68% probability), and a ‘final’ well-constrained ‘readvance’ after
ISSN:0959-6836
1477-0911
DOI:10.1177/09596836231157059