Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica
The late Quaternary glacial history of the Amery Oasis, and Prince Charles Mountains is of significant interest because about 10% of the total modern Antarctic ice outflow is discharged via the adjacent Lambert Glacier system. A glacial thrust moraine sequence deposited along the northern shoreline...
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Cambridge University Press
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ftunivnewcastnsw:uon:3370 2023-05-15T13:54:24+02:00 Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica Goodwin, Ian D. Hellstrom, John The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences 2007 http://hdl.handle.net/1959.13/33911 eng eng Cambridge University Press Antarctic Science Vol. 19, Issue 3, p. 365-372 10.1017/S0954102007000466 carbonate glacial meltwater lacustrine Lambert Glacier grounding oxygen isotope journal article 2007 ftunivnewcastnsw 2018-07-27T00:22:08Z The late Quaternary glacial history of the Amery Oasis, and Prince Charles Mountains is of significant interest because about 10% of the total modern Antarctic ice outflow is discharged via the adjacent Lambert Glacier system. A glacial thrust moraine sequence deposited along the northern shoreline of Radok Lake between 20–10 ka bp, overlies a layer of thin, aragonite crusts which provide important constraints on the glacial history of the Amery Oasis. The modern Radok Lake is fed by the terminal meltwaters of the alpine Battye Glacier. The aragonite crusts were deposited in shallow water of ancestral Radok Lake 53 ka bp, during the A3 warm event in Isotope Stage 3. Oxygen isotope (δ¹⁸) analysis of the last glacial-age aragonite crusts indicates that they precipitated from freshwater with a δ¹⁸OSMOW composition of -36%, which is 8% more depleted than the present water (-28%) in Radok Lake. A regional oxygen isotope (δ¹⁸O) and elevation relationship for snow is used to determine the source of meltwater and glacial ice in Radok Lake during the A3 warm event. This relationship indicates that Radok Lake received meltwater from the confluence of both Battye Glacier ice and an expansion of grounded western Lambert Glacier ice in the Amery embayment. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Battye Glacier East Antarctica Lambert Glacier Prince Charles Mountains NOVA: The University of Newcastle Research Online (Australia) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Antarctic Battye Glacier ENVELOPE(67.900,67.900,-70.867,-70.867) East Antarctica Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Radok Lake ENVELOPE(68.000,68.000,-70.867,-70.867) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
carbonate glacial meltwater lacustrine Lambert Glacier grounding oxygen isotope |
spellingShingle |
carbonate glacial meltwater lacustrine Lambert Glacier grounding oxygen isotope Goodwin, Ian D. Hellstrom, John Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
topic_facet |
carbonate glacial meltwater lacustrine Lambert Glacier grounding oxygen isotope |
description |
The late Quaternary glacial history of the Amery Oasis, and Prince Charles Mountains is of significant interest because about 10% of the total modern Antarctic ice outflow is discharged via the adjacent Lambert Glacier system. A glacial thrust moraine sequence deposited along the northern shoreline of Radok Lake between 20–10 ka bp, overlies a layer of thin, aragonite crusts which provide important constraints on the glacial history of the Amery Oasis. The modern Radok Lake is fed by the terminal meltwaters of the alpine Battye Glacier. The aragonite crusts were deposited in shallow water of ancestral Radok Lake 53 ka bp, during the A3 warm event in Isotope Stage 3. Oxygen isotope (δ¹⁸) analysis of the last glacial-age aragonite crusts indicates that they precipitated from freshwater with a δ¹⁸OSMOW composition of -36%, which is 8% more depleted than the present water (-28%) in Radok Lake. A regional oxygen isotope (δ¹⁸O) and elevation relationship for snow is used to determine the source of meltwater and glacial ice in Radok Lake during the A3 warm event. This relationship indicates that Radok Lake received meltwater from the confluence of both Battye Glacier ice and an expansion of grounded western Lambert Glacier ice in the Amery embayment. |
author2 |
The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences |
format |
Article in Journal/Newspaper |
author |
Goodwin, Ian D. Hellstrom, John |
author_facet |
Goodwin, Ian D. Hellstrom, John |
author_sort |
Goodwin, Ian D. |
title |
Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
title_short |
Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
title_full |
Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
title_fullStr |
Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at Radok Lake, Amery Oasis, Northern Prince Charles Mountains, East Antarctica |
title_sort |
glacio-lacustrine aragonite deposition, meltwater evolution and glacial history during isotope stage 3 at radok lake, amery oasis, northern prince charles mountains, east antarctica |
publisher |
Cambridge University Press |
publishDate |
2007 |
url |
http://hdl.handle.net/1959.13/33911 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(67.900,67.900,-70.867,-70.867) ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(68.000,68.000,-70.867,-70.867) |
geographic |
Amery Antarctic Battye Glacier East Antarctica Lambert Glacier Prince Charles Mountains Radok Lake |
geographic_facet |
Amery Antarctic Battye Glacier East Antarctica Lambert Glacier Prince Charles Mountains Radok Lake |
genre |
Antarc* Antarctic Antarctic Science Antarctica Battye Glacier East Antarctica Lambert Glacier Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Battye Glacier East Antarctica Lambert Glacier Prince Charles Mountains |
op_relation |
Antarctic Science Vol. 19, Issue 3, p. 365-372 10.1017/S0954102007000466 |
_version_ |
1766260149650980864 |