Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica
Abstract Radiometric and geochemical studies were carried out at Red Hill in the southern part of King George Island (South Shetland Islands, northern Antarctic Peninsula) on the Bransfield Strait coast. The rock succession at Red Hill has been determined to represent the Baranowski Glacier Group th...
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crdegruyter:10.1515/popore-2015-0022 2024-09-15T17:41:45+00:00 Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica Mozer, Anna Pécskay, Zoltán Krajewski, Krzysztof P. 2015 http://dx.doi.org/10.1515/popore-2015-0022 http://content.sciendo.com/view/journals/popore/36/4/article-p307.xml https://www.degruyter.com/view/j/popore.2015.36.issue-4/popore-2015-0022/popore-2015-0022.pdf unknown Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/3.0 Polish Polar Research volume 36, issue 4, page 307-324 ISSN 2081-8262 journal-article 2015 crdegruyter https://doi.org/10.1515/popore-2015-0022 2024-07-29T04:10:52Z Abstract Radiometric and geochemical studies were carried out at Red Hill in the southern part of King George Island (South Shetland Islands, northern Antarctic Peninsula) on the Bransfield Strait coast. The rock succession at Red Hill has been determined to represent the Baranowski Glacier Group that was previously assigned a Late Cretaceous age. Two formations were distinguished within this succession: the lower Llano Point Formation and the upper Zamek Formation. These formations have stratotypes defined further to the north on the western coast of Admiralty Bay. On Red Hill the Llano Point Formation consists of terrestrial lavas and pyroclastic breccia; the Zamek Formation consist predominantly of fine to coarse tuff, pyroclastic breccia, lavas, tuffaceous mud-, silt-, and sandstone, locally conglomeratic. The lower part of the Zamek Formation contains plant detritus ( Nothofagus , dicotyledonous, thermophilous ferns) and numerous coal seams (vitrinitic composition) that confirm the abundance of vegetation on stratovolcanic slopes and surrounding lowlands at that time. Selected basic to intermediate igneous rocks from the succession have been analysed for the whole-rock K-Ar age determination. The obtained results indicate that the Red Hill succession was formed in two stages: (1) from about 51–50 Ma; and (2) 46–42 Ma, i.e. during the Early to Middle Eocene. This, in combination with other data obtained from other Baranowski Glacier Group exposures on western coast of Admiralty Bay, confirms the recently defined position of the volcano-clastic succession in the stratigraphic scheme of King George Island. The new stratigraphic position and lithofacies development of the Red Hill succession strongly suggest its correlation with other Eocene formations containing fossil plants and coal seams that commonly occur on King George Island. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Baranowski Glacier Bransfield Strait King George Island Polar Research South Shetland Islands West Antarctica De Gruyter Polish Polar Research 36 4 307 324 |
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Abstract Radiometric and geochemical studies were carried out at Red Hill in the southern part of King George Island (South Shetland Islands, northern Antarctic Peninsula) on the Bransfield Strait coast. The rock succession at Red Hill has been determined to represent the Baranowski Glacier Group that was previously assigned a Late Cretaceous age. Two formations were distinguished within this succession: the lower Llano Point Formation and the upper Zamek Formation. These formations have stratotypes defined further to the north on the western coast of Admiralty Bay. On Red Hill the Llano Point Formation consists of terrestrial lavas and pyroclastic breccia; the Zamek Formation consist predominantly of fine to coarse tuff, pyroclastic breccia, lavas, tuffaceous mud-, silt-, and sandstone, locally conglomeratic. The lower part of the Zamek Formation contains plant detritus ( Nothofagus , dicotyledonous, thermophilous ferns) and numerous coal seams (vitrinitic composition) that confirm the abundance of vegetation on stratovolcanic slopes and surrounding lowlands at that time. Selected basic to intermediate igneous rocks from the succession have been analysed for the whole-rock K-Ar age determination. The obtained results indicate that the Red Hill succession was formed in two stages: (1) from about 51–50 Ma; and (2) 46–42 Ma, i.e. during the Early to Middle Eocene. This, in combination with other data obtained from other Baranowski Glacier Group exposures on western coast of Admiralty Bay, confirms the recently defined position of the volcano-clastic succession in the stratigraphic scheme of King George Island. The new stratigraphic position and lithofacies development of the Red Hill succession strongly suggest its correlation with other Eocene formations containing fossil plants and coal seams that commonly occur on King George Island. |
format |
Article in Journal/Newspaper |
author |
Mozer, Anna Pécskay, Zoltán Krajewski, Krzysztof P. |
spellingShingle |
Mozer, Anna Pécskay, Zoltán Krajewski, Krzysztof P. Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
author_facet |
Mozer, Anna Pécskay, Zoltán Krajewski, Krzysztof P. |
author_sort |
Mozer, Anna |
title |
Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
title_short |
Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
title_full |
Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
title_fullStr |
Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
title_full_unstemmed |
Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica |
title_sort |
eocene age of the baranowski glacier group at red hill, king george island, west antarctica |
publisher |
Walter de Gruyter GmbH |
publishDate |
2015 |
url |
http://dx.doi.org/10.1515/popore-2015-0022 http://content.sciendo.com/view/journals/popore/36/4/article-p307.xml https://www.degruyter.com/view/j/popore.2015.36.issue-4/popore-2015-0022/popore-2015-0022.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Baranowski Glacier Bransfield Strait King George Island Polar Research South Shetland Islands West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Baranowski Glacier Bransfield Strait King George Island Polar Research South Shetland Islands West Antarctica |
op_source |
Polish Polar Research volume 36, issue 4, page 307-324 ISSN 2081-8262 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/3.0 |
op_doi |
https://doi.org/10.1515/popore-2015-0022 |
container_title |
Polish Polar Research |
container_volume |
36 |
container_issue |
4 |
container_start_page |
307 |
op_container_end_page |
324 |
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1810488008439234560 |