Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand
A suite of cosmogenic radionuclide ages taken from boulders on lateral and latero-terminal moraines in the Rangitata Valley, eastern South Island, New Zealand demonstrates that relatively thick ice occupied valley reaches inland of the Rangitata Gorge until c. 21 ka. Thereafter ice began to thin, an...
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ftutahsudc:oai:digitalcommons.usu.edu:geology_facpub-1520 2023-05-15T17:09:26+02:00 Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand Shulmeister, James Fink, David Winkler, Stefan Thackray, Glenn D. Borsellino, Rosabella Hemmingsen, Maree Rittenour, Tammy M. Pergamon Press 2018-02-20T08:00:00Z https://digitalcommons.usu.edu/geology_facpub/521 unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/geology_facpub/521 Geosciences Faculty Publications New Zealand Rangitata Valley Cosmogenic Radionuclide Moraines Earth Sciences Geology Physical Sciences and Mathematics text 2018 ftutahsudc 2022-03-07T21:51:45Z A suite of cosmogenic radionuclide ages taken from boulders on lateral and latero-terminal moraines in the Rangitata Valley, eastern South Island, New Zealand demonstrates that relatively thick ice occupied valley reaches inland of the Rangitata Gorge until c. 21 ka. Thereafter ice began to thin, and by c. 17 ka it had retreated 33 km up-valley of the Rangitata Gorge to the Butler-Brabazon Downs, a structurally created basin in the upper Rangitata Valley. Despite its magnitude, this retreat represents a minor ice volume reduction from 21 ka to 17 ka, and numerous lateral moraines preserved suggest a relatively gradual retreat over that 4 ka period. In contrast to records from adjacent valleys, there is no evidence for an ice-collapse at c. 18 ka. We argue that the Rangitata record constitutes a more direct record of glacial response to deglacial climate than other records where glacial dynamics were influenced by proglacial lake development, such as the Rakaia Valley to the North and the major valleys in the Mackenzie Basin to the south-west. Our data supports the concept of a gradual warming during the early deglaciation in the South Island New Zealand. Text Mackenzie Basin Utah State University: DigitalCommons@USU New Zealand |
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Utah State University: DigitalCommons@USU |
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ftutahsudc |
language |
unknown |
topic |
New Zealand Rangitata Valley Cosmogenic Radionuclide Moraines Earth Sciences Geology Physical Sciences and Mathematics |
spellingShingle |
New Zealand Rangitata Valley Cosmogenic Radionuclide Moraines Earth Sciences Geology Physical Sciences and Mathematics Shulmeister, James Fink, David Winkler, Stefan Thackray, Glenn D. Borsellino, Rosabella Hemmingsen, Maree Rittenour, Tammy M. Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
topic_facet |
New Zealand Rangitata Valley Cosmogenic Radionuclide Moraines Earth Sciences Geology Physical Sciences and Mathematics |
description |
A suite of cosmogenic radionuclide ages taken from boulders on lateral and latero-terminal moraines in the Rangitata Valley, eastern South Island, New Zealand demonstrates that relatively thick ice occupied valley reaches inland of the Rangitata Gorge until c. 21 ka. Thereafter ice began to thin, and by c. 17 ka it had retreated 33 km up-valley of the Rangitata Gorge to the Butler-Brabazon Downs, a structurally created basin in the upper Rangitata Valley. Despite its magnitude, this retreat represents a minor ice volume reduction from 21 ka to 17 ka, and numerous lateral moraines preserved suggest a relatively gradual retreat over that 4 ka period. In contrast to records from adjacent valleys, there is no evidence for an ice-collapse at c. 18 ka. We argue that the Rangitata record constitutes a more direct record of glacial response to deglacial climate than other records where glacial dynamics were influenced by proglacial lake development, such as the Rakaia Valley to the North and the major valleys in the Mackenzie Basin to the south-west. Our data supports the concept of a gradual warming during the early deglaciation in the South Island New Zealand. |
author2 |
Pergamon Press |
format |
Text |
author |
Shulmeister, James Fink, David Winkler, Stefan Thackray, Glenn D. Borsellino, Rosabella Hemmingsen, Maree Rittenour, Tammy M. |
author_facet |
Shulmeister, James Fink, David Winkler, Stefan Thackray, Glenn D. Borsellino, Rosabella Hemmingsen, Maree Rittenour, Tammy M. |
author_sort |
Shulmeister, James |
title |
Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
title_short |
Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
title_full |
Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
title_fullStr |
Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
title_full_unstemmed |
Evidence for Slow Late-Glacial Ice Retreat in the Upper Rangitata Valley, South Island, New Zealand |
title_sort |
evidence for slow late-glacial ice retreat in the upper rangitata valley, south island, new zealand |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2018 |
url |
https://digitalcommons.usu.edu/geology_facpub/521 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Mackenzie Basin |
genre_facet |
Mackenzie Basin |
op_source |
Geosciences Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/geology_facpub/521 |
_version_ |
1766065526843375616 |