Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy
Isotopic and palaeomagnetic studies were carried out in the central part of King George Island. Selected mafic to intermediate igneous rocks were sampled for this purpose. Single-grain U-Pb dating of zircons from basalts to dacites was controlled by a whole rock 40Ar- 39Ar data and the magneto strat...
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Polish Geological Institute
2015
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/53481 2023-05-15T13:56:44+02:00 Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy Nawrocki, J. Panczyk, Magdalena Williams, Ian 2015-12-10T22:25:26Z http://hdl.handle.net/1885/53481 unknown Polish Geological Institute 1641-7291 http://hdl.handle.net/1885/53481 GEOLOGICAL QUARTERLY Journal article 2015 ftanucanberra 2015-12-21T23:33:27Z Isotopic and palaeomagnetic studies were carried out in the central part of King George Island. Selected mafic to intermediate igneous rocks were sampled for this purpose. Single-grain U-Pb dating of zircons from basalts to dacites was controlled by a whole rock 40Ar- 39Ar data and the magneto stratigraphy. Five magmatic activity phases were distinguished in the SE coast of King George Island. The oldest, late Cretaceous (Campanian) phase represented by basalts of the Uchatka Point Formation are followed by the early to middle Eocene (~53-43 Ma) phase documented by the lava flows whose ages decrease from SW to NE. Next younger magmatic activity phases were recorded by the lava flows or vertical intrusions emplaced in the late Eocene (~37-35 Ma), late Oligocene (~28-25 Ma) and late Pliocene to Holocene. The early to middle Eocene magmatic activity phase was the most extensive, producing the largest volume of magma in the study area. The new age determinations allow a more precise and credible stratigraphic correlation of the interbeds of sedimentary rocks observed in some places within the magmatic succession. The glacial provenance of the Hervé Cove diamictite is not obvious. It might represent a mountain river environment. Intense volcanic activity could be additional factor modelling the climate conditions of Antarctica in Paleogene. Article in Journal/Newspaper Antarc* Antarctica King George Island West Antarctica Australian National University: ANU Digital Collections King George Island West Antarctica Hervé Cove ENVELOPE(-58.534,-58.534,-62.179,-62.179) Uchatka Point ENVELOPE(-58.417,-58.417,-62.221,-62.221) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
Isotopic and palaeomagnetic studies were carried out in the central part of King George Island. Selected mafic to intermediate igneous rocks were sampled for this purpose. Single-grain U-Pb dating of zircons from basalts to dacites was controlled by a whole rock 40Ar- 39Ar data and the magneto stratigraphy. Five magmatic activity phases were distinguished in the SE coast of King George Island. The oldest, late Cretaceous (Campanian) phase represented by basalts of the Uchatka Point Formation are followed by the early to middle Eocene (~53-43 Ma) phase documented by the lava flows whose ages decrease from SW to NE. Next younger magmatic activity phases were recorded by the lava flows or vertical intrusions emplaced in the late Eocene (~37-35 Ma), late Oligocene (~28-25 Ma) and late Pliocene to Holocene. The early to middle Eocene magmatic activity phase was the most extensive, producing the largest volume of magma in the study area. The new age determinations allow a more precise and credible stratigraphic correlation of the interbeds of sedimentary rocks observed in some places within the magmatic succession. The glacial provenance of the Hervé Cove diamictite is not obvious. It might represent a mountain river environment. Intense volcanic activity could be additional factor modelling the climate conditions of Antarctica in Paleogene. |
format |
Article in Journal/Newspaper |
author |
Nawrocki, J. Panczyk, Magdalena Williams, Ian |
spellingShingle |
Nawrocki, J. Panczyk, Magdalena Williams, Ian Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
author_facet |
Nawrocki, J. Panczyk, Magdalena Williams, Ian |
author_sort |
Nawrocki, J. |
title |
Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
title_short |
Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
title_full |
Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
title_fullStr |
Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
title_full_unstemmed |
Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
title_sort |
isotopic ages of selected magmatic rocks from king george island (west antarctica) controlled by magnetostratigraphy |
publisher |
Polish Geological Institute |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/53481 |
long_lat |
ENVELOPE(-58.534,-58.534,-62.179,-62.179) ENVELOPE(-58.417,-58.417,-62.221,-62.221) |
geographic |
King George Island West Antarctica Hervé Cove Uchatka Point |
geographic_facet |
King George Island West Antarctica Hervé Cove Uchatka Point |
genre |
Antarc* Antarctica King George Island West Antarctica |
genre_facet |
Antarc* Antarctica King George Island West Antarctica |
op_source |
GEOLOGICAL QUARTERLY |
op_relation |
1641-7291 http://hdl.handle.net/1885/53481 |
_version_ |
1766264310443540480 |