Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica
The East Antarctic Ice Sheet is the largest ice mass on Earth with a capacity to raise global sea level by up to 65 m. As the Lambert Glacier–Amery Ice Shelf drainage system is the largest to reach the coast of Antarctica, quantifying its evolution over the Quaternary is a vital component in develop...
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ftunivnewengland:oai:rune.une.edu.au:1959.11/1570 2023-08-27T04:03:48+02:00 Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica Fink, D McKelvey, Barrie Cooper School of Environmental and Rural Science Hambrey, M Fabel, D Brown, R 2006 https://hdl.handle.net/1959.11/1570 en eng Elsevier BV 10.1016/j.epsl.2005.12.006 https://hdl.handle.net/1959.11/1570 une:1628 Glaciology Journal Article 2006 ftunivnewengland 2023-08-10T18:53:25Z The East Antarctic Ice Sheet is the largest ice mass on Earth with a capacity to raise global sea level by up to 65 m. As the Lambert Glacier–Amery Ice Shelf drainage system is the largest to reach the coast of Antarctica, quantifying its evolution over the Quaternary is a vital component in developing an understanding of the Antarctic response to future climate change. Here we present a deglaciation chronology based on 10Be and 26Al in situ cosmogenic exposure ages of the northern Prince Charles Mountains, which flank the Lambert Glacier–Amery system, and that records the progressive emergence of McLeod Massif and Radok Lake basin from beneath the Mac.Robertson Land lobe of the East Antarctic Ice Sheet. The exposure ages monotonically decrease with both decreasing altitude and increasing proximity to the Amery Ice Shelf at the Antarctic coast. Exposure ages from the crests of McLeod Massif near the edge the Amery Ice Shelf and from Fisher Massif, 75 km further inland, each at 1200 m above sea level, are 2.2 ± 0.3 and 1.9 ± 0.2 Ma, respectively, suggesting their continuous exposure above the ice sheet at least since close to the Plio–Pleistocene boundary. An extensive plateau at 800 m altitude on McLeod Massif above Battye Glacier records the massif's increased emergence above the ice sheet surface at about between 880 and 930 ka ago indicating 400 m of ice volume reduction in the mid Pleistocene. Correcting these apparent ages for a reasonable choice in erosion rate would extend this event to 1.15 Ma — a period identified from Prydz Bay ODP core-1167 when sedimentation composition alters and rates decrease 10-fold. Exposure ages from boulder-mantled erosional surfaces above and beyond the northern end of Radok Lake at 220 m, range from 28 to 121 ka. Independent of choice of model interpretation to explain this age spread, the most recent major reoccupation of Radok Lake by Battye Glacier ice occurred during the last glacial cycle. Moraine ridges at the lower altitude of 70–125 m were deposited during the final ... Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Battye Glacier Ice Sheet Ice Shelf Lambert Glacier Mac.Robertson Land Prince Charles Mountains Prydz Bay Research UNE - University of New England at Armidale, NSW Australia Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic Battye Glacier ENVELOPE(67.900,67.900,-70.867,-70.867) East Antarctic Ice Sheet Fisher Massif ENVELOPE(67.667,67.667,-72.317,-72.317) Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Mac.Robertson Land ENVELOPE(65.000,65.000,-70.000,-70.000) McLeod ENVELOPE(-127.689,-127.689,55.254,55.254) McLeod Massif ENVELOPE(68.000,68.000,-70.767,-70.767) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Prydz Bay Radok Lake ENVELOPE(68.000,68.000,-70.867,-70.867) The Antarctic |
institution |
Open Polar |
collection |
Research UNE - University of New England at Armidale, NSW Australia |
op_collection_id |
ftunivnewengland |
language |
English |
topic |
Glaciology |
spellingShingle |
Glaciology Fink, D McKelvey, Barrie Cooper School of Environmental and Rural Science Hambrey, M Fabel, D Brown, R Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
topic_facet |
Glaciology |
description |
The East Antarctic Ice Sheet is the largest ice mass on Earth with a capacity to raise global sea level by up to 65 m. As the Lambert Glacier–Amery Ice Shelf drainage system is the largest to reach the coast of Antarctica, quantifying its evolution over the Quaternary is a vital component in developing an understanding of the Antarctic response to future climate change. Here we present a deglaciation chronology based on 10Be and 26Al in situ cosmogenic exposure ages of the northern Prince Charles Mountains, which flank the Lambert Glacier–Amery system, and that records the progressive emergence of McLeod Massif and Radok Lake basin from beneath the Mac.Robertson Land lobe of the East Antarctic Ice Sheet. The exposure ages monotonically decrease with both decreasing altitude and increasing proximity to the Amery Ice Shelf at the Antarctic coast. Exposure ages from the crests of McLeod Massif near the edge the Amery Ice Shelf and from Fisher Massif, 75 km further inland, each at 1200 m above sea level, are 2.2 ± 0.3 and 1.9 ± 0.2 Ma, respectively, suggesting their continuous exposure above the ice sheet at least since close to the Plio–Pleistocene boundary. An extensive plateau at 800 m altitude on McLeod Massif above Battye Glacier records the massif's increased emergence above the ice sheet surface at about between 880 and 930 ka ago indicating 400 m of ice volume reduction in the mid Pleistocene. Correcting these apparent ages for a reasonable choice in erosion rate would extend this event to 1.15 Ma — a period identified from Prydz Bay ODP core-1167 when sedimentation composition alters and rates decrease 10-fold. Exposure ages from boulder-mantled erosional surfaces above and beyond the northern end of Radok Lake at 220 m, range from 28 to 121 ka. Independent of choice of model interpretation to explain this age spread, the most recent major reoccupation of Radok Lake by Battye Glacier ice occurred during the last glacial cycle. Moraine ridges at the lower altitude of 70–125 m were deposited during the final ... |
format |
Article in Journal/Newspaper |
author |
Fink, D McKelvey, Barrie Cooper School of Environmental and Rural Science Hambrey, M Fabel, D Brown, R |
author_facet |
Fink, D McKelvey, Barrie Cooper School of Environmental and Rural Science Hambrey, M Fabel, D Brown, R |
author_sort |
Fink, D |
title |
Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
title_short |
Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
title_full |
Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
title_fullStr |
Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
title_full_unstemmed |
Pleistocene deglaciation chronology of the Amery Oasis and Radok Lake, northern Prince Charles Mountains, Antarctica |
title_sort |
pleistocene deglaciation chronology of the amery oasis and radok lake, northern prince charles mountains, antarctica |
publisher |
Elsevier BV |
publishDate |
2006 |
url |
https://hdl.handle.net/1959.11/1570 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(67.900,67.900,-70.867,-70.867) ENVELOPE(67.667,67.667,-72.317,-72.317) ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(65.000,65.000,-70.000,-70.000) ENVELOPE(-127.689,-127.689,55.254,55.254) ENVELOPE(68.000,68.000,-70.767,-70.767) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(68.000,68.000,-70.867,-70.867) |
geographic |
Amery Amery Ice Shelf Antarctic Battye Glacier East Antarctic Ice Sheet Fisher Massif Lambert Glacier Mac.Robertson Land McLeod McLeod Massif Prince Charles Mountains Prydz Bay Radok Lake The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic Battye Glacier East Antarctic Ice Sheet Fisher Massif Lambert Glacier Mac.Robertson Land McLeod McLeod Massif Prince Charles Mountains Prydz Bay Radok Lake The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Battye Glacier Ice Sheet Ice Shelf Lambert Glacier Mac.Robertson Land Prince Charles Mountains Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Battye Glacier Ice Sheet Ice Shelf Lambert Glacier Mac.Robertson Land Prince Charles Mountains Prydz Bay |
op_relation |
10.1016/j.epsl.2005.12.006 https://hdl.handle.net/1959.11/1570 une:1628 |
_version_ |
1775346900520665088 |