Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica
The Blue Dyke and Jardine Peak are subvertical hypabyssal intrusions cutting a stratiform volcanic sequence in the Admiralty Bay area on King George Island (South Shetlands, Antarctica). The rocks are porphyritic, crystal−rich basaltic andesites. Tiny zir− con crystals were used for single grain SHR...
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2016
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/104124 2023-05-15T13:57:31+02:00 Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica Pańczyk, Magdalena Nawrocki, Jerzy Williams, Ian S. 2016-06-16T01:01:06Z http://hdl.handle.net/1885/104124 unknown Polska Akademia Nauk (Polish Academy of Sciences) 0138-0338 http://hdl.handle.net/1885/104124 http://www.sherpa.ac.uk/romeo/issn/2081-8262/."Publisher's version/PDF may be used. On authors' personal website or institutional repository" from SHERPA/RoMEO site (as at 16/06/16). Polish Polar Research Antarctica King George Island Late Oligocene U−Pb SHRIMP dating Journal article 2016 ftanucanberra 2016-06-20T22:18:13Z The Blue Dyke and Jardine Peak are subvertical hypabyssal intrusions cutting a stratiform volcanic sequence in the Admiralty Bay area on King George Island (South Shetlands, Antarctica). The rocks are porphyritic, crystal−rich basaltic andesites. Tiny zir− con crystals were used for single grain SHRIMP U−Pb dating. The mean ages calculated for the zircon populations from both intrusions indicates Late Oligocene (Chattian) formations. Zircon grains from the Blue Dyke gave the mean age of 27.9±0.3 Ma, whereas those from the Jardine Peak are slightly younger displaying the mean age of 25.4 ± 0.4 Ma: a Late Oligocene (Chattian) crystallization age the inferred of both these intrusions. These are much younger than previous Eocene K−Ar and Ar−Ar ages for such rocks and suggest that formation of the King George Island intrusions can be related to tectonic processes that ac− companied the opening of the Drake Passage. Article in Journal/Newspaper Antarc* Antarctica Drake Passage King George Island Polar Research West Antarctica Australian National University: ANU Digital Collections Admiralty Bay Blue Dyke ENVELOPE(-58.450,-58.450,-62.225,-62.225) Drake Passage Jardine Peak ENVELOPE(-58.498,-58.498,-62.167,-62.167) King George Island West Antarctica |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Antarctica King George Island Late Oligocene U−Pb SHRIMP dating |
spellingShingle |
Antarctica King George Island Late Oligocene U−Pb SHRIMP dating Pańczyk, Magdalena Nawrocki, Jerzy Williams, Ian S. Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
topic_facet |
Antarctica King George Island Late Oligocene U−Pb SHRIMP dating |
description |
The Blue Dyke and Jardine Peak are subvertical hypabyssal intrusions cutting a stratiform volcanic sequence in the Admiralty Bay area on King George Island (South Shetlands, Antarctica). The rocks are porphyritic, crystal−rich basaltic andesites. Tiny zir− con crystals were used for single grain SHRIMP U−Pb dating. The mean ages calculated for the zircon populations from both intrusions indicates Late Oligocene (Chattian) formations. Zircon grains from the Blue Dyke gave the mean age of 27.9±0.3 Ma, whereas those from the Jardine Peak are slightly younger displaying the mean age of 25.4 ± 0.4 Ma: a Late Oligocene (Chattian) crystallization age the inferred of both these intrusions. These are much younger than previous Eocene K−Ar and Ar−Ar ages for such rocks and suggest that formation of the King George Island intrusions can be related to tectonic processes that ac− companied the opening of the Drake Passage. |
format |
Article in Journal/Newspaper |
author |
Pańczyk, Magdalena Nawrocki, Jerzy Williams, Ian S. |
author_facet |
Pańczyk, Magdalena Nawrocki, Jerzy Williams, Ian S. |
author_sort |
Pańczyk, Magdalena |
title |
Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
title_short |
Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
title_full |
Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
title_fullStr |
Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
title_full_unstemmed |
Isotope age constraint for the Blue Dyke and Jardine Peak subvertical intrusions of King George Island, West Antarctica |
title_sort |
isotope age constraint for the blue dyke and jardine peak subvertical intrusions of king george island, west antarctica |
publisher |
Polska Akademia Nauk (Polish Academy of Sciences) |
publishDate |
2016 |
url |
http://hdl.handle.net/1885/104124 |
long_lat |
ENVELOPE(-58.450,-58.450,-62.225,-62.225) ENVELOPE(-58.498,-58.498,-62.167,-62.167) |
geographic |
Admiralty Bay Blue Dyke Drake Passage Jardine Peak King George Island West Antarctica |
geographic_facet |
Admiralty Bay Blue Dyke Drake Passage Jardine Peak King George Island West Antarctica |
genre |
Antarc* Antarctica Drake Passage King George Island Polar Research West Antarctica |
genre_facet |
Antarc* Antarctica Drake Passage King George Island Polar Research West Antarctica |
op_source |
Polish Polar Research |
op_relation |
0138-0338 http://hdl.handle.net/1885/104124 |
op_rights |
http://www.sherpa.ac.uk/romeo/issn/2081-8262/."Publisher's version/PDF may be used. On authors' personal website or institutional repository" from SHERPA/RoMEO site (as at 16/06/16). |
_version_ |
1766265196481871872 |