scholarly journals Eocene sedimentary facies in a volcanogenic succession on King George Island, South Shetland Islands: a record of pre-ice sheet terrestrial environments in West Antarctica

2013 ◽  
Vol 57 (3) ◽  
Author(s):  
Anna MOZER
Keyword(s):  
Ice Sheet ◽  
Sedimentary Facies ◽  
South Shetland Islands ◽  
King George Island ◽  
West Antarctica ◽  
Shetland Islands ◽  
Terrestrial Environments

Radiocarbon ages of sorted circles on King George Island, South Shetland Islands, West Antarctica

2006 ◽  
Vol 18 (2) ◽  
pp. 265-270 ◽  
Author(s):  
Gi Young Jeong
Keyword(s):  
Vegetation History ◽  
Sediment Cores ◽  
South Shetland Islands ◽  
King George Island ◽  
West Antarctica ◽  
Shetland Islands ◽  
Fine Grained ◽  
Plant Remains ◽  
Terrestrial Environments ◽  
History Of

Lichen and moss colonize the surface of glacial debris left after deglaciation. Transformation of unsorted debris into a sorted circle causes early plant remains to be preserved in the fine-grained centre encircled by a coarse, clastic border. Systematic radiocarbon dating of plant remains from the sorted stone circles on King George Island, South Shetland Islands, West Antarctica, yielded ages between 290–4710 14C yrs BP. The oldest age obtained from a large stone circle approximated the regional deglaciation age recorded in marine and lacustrine sediment cores. Most of the ages, however, underestimate the time of deglaciation due to the continual addition of younger plant remains, changes in soil motion, and the diverse vegetation history. Despite its current limitations as a terrestrial proxy for regional deglaciation, further systematic dating and careful interpretation based on surface processes may improve the usefulness of sorted circles in reconstructing the glacial and periglacial history of polar terrestrial environments.

scholarly journals Morphology and variations of glacial drainage basins in the King George Island ice field, Antarctica

1999 ◽  
Vol 29 ◽  
pp. 220-224 ◽  
Author(s):  
Jefferson C. Simões ◽  
Ulisses F. Bremer ◽  
Francisco E. Aquino ◽  
Francisco A. Ferron
Keyword(s):  
South Shetland Islands ◽  
Field Observations ◽  
Multispectral Imagery ◽  
King George Island ◽  
West Antarctica ◽  
Drainage Basins ◽  
Shetland Islands ◽  
Radio Echo Sounding ◽  
Ice Field ◽  
Glacial Cover

AbstractA Système probatoire pour l’observation de la terre (SPOT) mosaic of King George Island, the largest (1250 Km2) of the South Shetland Islands, West Antarctica, shows its major morphological features. Three main ice domes and 70 glacier drainage basins, covering 92.7% of the King George Island area, strongly controlled by the subglacial morphology and drained by relatively fast-moving tidewater outlet glaciers, were delineated. A general retreat of ice fronts through four decades, more intensely on the eastern side of the island (to the Bransfield Strait), resulted in the loss of about 7% of the glacial cover area. Superficial snow fades were derived from SPOT multispectral imagery and, together with field observations, allowed the transient-snowline elevation to be obtained The latter is estimated to have risen from about 200-250 m in the mid-1950s to 300-350 m by 1988. Spot radio-echo sounding surveys give an overview of the bedrock morphology.

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