Northern Victoria Land: petrology
Cenozoic magmatic rocks related to the West Antarctic Rift System crop out right across Antarctica, in Victoria Land, Marie Byrd Land and into Ellsworth Land. Northern Victoria Land, located at the northwestern tip of the western rift shoulder, is unique in hosting the longest record of the rift-rel...
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2020
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ftdatacite:10.6084/m9.figshare.c.5198177 2023-05-15T13:44:20+02:00 Northern Victoria Land: petrology S. Rocchi J.L. Smellie 2020 https://dx.doi.org/10.6084/m9.figshare.c.5198177 https://geolsoc.figshare.com/collections/Northern_Victoria_Land_II_Petrology/5198177 unknown Geological Society of London https://dx.doi.org/10.1144/m55-2019-19 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5198177 https://doi.org/10.1144/m55-2019-19 2021-11-05T12:55:41Z Cenozoic magmatic rocks related to the West Antarctic Rift System crop out right across Antarctica, in Victoria Land, Marie Byrd Land and into Ellsworth Land. Northern Victoria Land, located at the northwestern tip of the western rift shoulder, is unique in hosting the longest record of the rift-related igneous activity: plutonic rocks and cogenetic dyke swarms cover the time span from c . 50 to 20 Ma, and volcanic rocks are recorded from 15 Ma to the present. The origin of the entire igneous suite is debated, nevertheless the combination of geochemical and isotopic data with the regional tectonic history supports a model with no role for a mantle plume. Amagmatic extension during the Cretaceous generated an autometasomatized mantle source that, during Eocene–present activity, produced magma by small degrees of melting induced by the transtensional activity of translithospheric fault systems. The emplacement of Eocene–Oligocene plutons and dyke swarms was focused along these fault systems. Conversely, the location of the mid-Miocene to present volcanoes is governed by lithospheric necking along the Ross Sea coast for the largest volcanic edifices, while inland, smaller central volcanoes and scoria cones are related to the establishment of magma chambers in thicker crust. Article in Journal/Newspaper Antarc* Antarctic Antarctica Marie Byrd Land Ross Sea Victoria Land DataCite Metadata Store (German National Library of Science and Technology) Antarctic Ross Sea Victoria Land Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences S. Rocchi J.L. Smellie Northern Victoria Land: petrology |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
Cenozoic magmatic rocks related to the West Antarctic Rift System crop out right across Antarctica, in Victoria Land, Marie Byrd Land and into Ellsworth Land. Northern Victoria Land, located at the northwestern tip of the western rift shoulder, is unique in hosting the longest record of the rift-related igneous activity: plutonic rocks and cogenetic dyke swarms cover the time span from c . 50 to 20 Ma, and volcanic rocks are recorded from 15 Ma to the present. The origin of the entire igneous suite is debated, nevertheless the combination of geochemical and isotopic data with the regional tectonic history supports a model with no role for a mantle plume. Amagmatic extension during the Cretaceous generated an autometasomatized mantle source that, during Eocene–present activity, produced magma by small degrees of melting induced by the transtensional activity of translithospheric fault systems. The emplacement of Eocene–Oligocene plutons and dyke swarms was focused along these fault systems. Conversely, the location of the mid-Miocene to present volcanoes is governed by lithospheric necking along the Ross Sea coast for the largest volcanic edifices, while inland, smaller central volcanoes and scoria cones are related to the establishment of magma chambers in thicker crust. |
format |
Article in Journal/Newspaper |
author |
S. Rocchi J.L. Smellie |
author_facet |
S. Rocchi J.L. Smellie |
author_sort |
S. Rocchi |
title |
Northern Victoria Land: petrology |
title_short |
Northern Victoria Land: petrology |
title_full |
Northern Victoria Land: petrology |
title_fullStr |
Northern Victoria Land: petrology |
title_full_unstemmed |
Northern Victoria Land: petrology |
title_sort |
northern victoria land: petrology |
publisher |
Geological Society of London |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5198177 https://geolsoc.figshare.com/collections/Northern_Victoria_Land_II_Petrology/5198177 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-85.000,-85.000,-75.000,-75.000) |
geographic |
Antarctic Ross Sea Victoria Land Byrd Marie Byrd Land Ellsworth Land |
geographic_facet |
Antarctic Ross Sea Victoria Land Byrd Marie Byrd Land Ellsworth Land |
genre |
Antarc* Antarctic Antarctica Marie Byrd Land Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Marie Byrd Land Ross Sea Victoria Land |
op_relation |
https://dx.doi.org/10.1144/m55-2019-19 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5198177 https://doi.org/10.1144/m55-2019-19 |
_version_ |
1766200324159176704 |