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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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/53481 2024-01-14T10:01:41+01:00 Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy Nawrocki, J. Panczyk, Magdalena Williams, Ian http://hdl.handle.net/1885/53481 https://openresearch-repository.anu.edu.au/bitstream/1885/53481/5/Williams_KGeorge.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/53481/7/01_Nawrocki_Isotopic_ages_of_selected_2011.pdf.jpg unknown Polish Geological Institute 1641-7291 http://hdl.handle.net/1885/53481 https://openresearch-repository.anu.edu.au/bitstream/1885/53481/5/Williams_KGeorge.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/53481/7/01_Nawrocki_Isotopic_ages_of_selected_2011.pdf.jpg GEOLOGICAL QUARTERLY Keywords: argon-argon dating basalt Cretaceous diamictite Eocene geochronology Holocene isotopic composition magma magnetostratigraphy Oligocene paleomagnetism Pliocene stratigraphic correlation uranium-lead dating Antarctica King George Island Sou Antarctica Isotopic ages Journal article ftanucanberra 2023-12-15T09:36:19Z 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 |
topic |
Keywords: argon-argon dating basalt Cretaceous diamictite Eocene geochronology Holocene isotopic composition magma magnetostratigraphy Oligocene paleomagnetism Pliocene stratigraphic correlation uranium-lead dating Antarctica King George Island Sou Antarctica Isotopic ages |
spellingShingle |
Keywords: argon-argon dating basalt Cretaceous diamictite Eocene geochronology Holocene isotopic composition magma magnetostratigraphy Oligocene paleomagnetism Pliocene stratigraphic correlation uranium-lead dating Antarctica King George Island Sou Antarctica Isotopic ages Nawrocki, J. Panczyk, Magdalena Williams, Ian Isotopic ages of selected magmatic rocks from King George Island (West Antarctica) controlled by magnetostratigraphy |
topic_facet |
Keywords: argon-argon dating basalt Cretaceous diamictite Eocene geochronology Holocene isotopic composition magma magnetostratigraphy Oligocene paleomagnetism Pliocene stratigraphic correlation uranium-lead dating Antarctica King George Island Sou Antarctica Isotopic ages |
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 |
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 |
url |
http://hdl.handle.net/1885/53481 https://openresearch-repository.anu.edu.au/bitstream/1885/53481/5/Williams_KGeorge.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/53481/7/01_Nawrocki_Isotopic_ages_of_selected_2011.pdf.jpg |
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 https://openresearch-repository.anu.edu.au/bitstream/1885/53481/5/Williams_KGeorge.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/53481/7/01_Nawrocki_Isotopic_ages_of_selected_2011.pdf.jpg |
_version_ |
1788067443938164736 |