Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)

Studying the magnetic fabric in volcanic edifices, particularly lava flows from recent eruptions, allows us to understand the orientation distribution of the minerals related to the flow direction and properly characterize older and/or eroded flows. In this work, the magnetic fabric from recent (Qua...

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Autores: Oliva-Urcia, B., López-Martínez, J., Maestro, A., Gil, A., Schmid, T., Lambán, L.J., Galé, C., Ubide, T., Lago, M.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Recursos:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:118058
Acesso em linha:http://zaguan.unizar.es/record/118058
Access Level:acceso abierto
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spelling Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)Oliva-Urcia, B.López-Martínez, J.Maestro, A.Gil, A.Schmid, T.Lambán, L.J.Galé, C.Ubide, T.Lago, M.Studying the magnetic fabric in volcanic edifices, particularly lava flows from recent eruptions, allows us to understand the orientation distribution of the minerals related to the flow direction and properly characterize older and/or eroded flows. In this work, the magnetic fabric from recent (Quaternary) lava flows (slightly inclined in seven sites and plateau lavas in two sites), pyroclastic deposits (two sites from a scoria cone) and volcanic cones, domes and plugs (three sites) from Penguin and Bridgeman islands, located in the Bransfield backarc basin, are presented. The volcanism in the two islands is related to rifting occurring due to the opening of the Bransfield Strait, between the South Shetlands archipelago and the Antarctic Peninsula. The direction of flow of magmatic material is unknown. Rock magnetic analyses, low temperature measurements and electron microscope observations (back-scattered electron imaging and Energy Dispersive X-ray analyses) reveal a Ti-poor magnetite (and maghemite) as the main carrier of the magnetic fabric. Hematite may be present in some samples. Samples from the centre of the lavas reveal a magnetic lineation either parallel or imbricated with respect to the flow plane, whereas in the plateau lavas the magnetic lineation is contained within the subhorizontal plane except in vesicle-rich samples, where imbrication occurs. The magnetic lineation indicates a varied flow direction in Bridgeman Island with respect to the spreading Bransfield Basin axis. The flow direction in the plateau lavas on Penguin Island is deduced from the imbrication of the magnetic fabric in the more vesicular parts, suggesting a SE-NW flow. The volcanic domes are also imbricated with respect to an upward flow, and the bombs show scattered distribution.2021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/118058reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/MINECO/CTM2014-57119-Rinfo:eu-repo/grantAgreement/ES/MINECO/RTI2018-098099-B-I00info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1180582026-05-29T13:59:51Z
dc.title.none.fl_str_mv Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
title Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
spellingShingle Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
Oliva-Urcia, B.
title_short Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
title_full Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
title_fullStr Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
title_full_unstemmed Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
title_sort Magnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica)
dc.creator.none.fl_str_mv Oliva-Urcia, B.
López-Martínez, J.
Maestro, A.
Gil, A.
Schmid, T.
Lambán, L.J.
Galé, C.
Ubide, T.
Lago, M.
author Oliva-Urcia, B.
author_facet Oliva-Urcia, B.
López-Martínez, J.
Maestro, A.
Gil, A.
Schmid, T.
Lambán, L.J.
Galé, C.
Ubide, T.
Lago, M.
author_role author
author2 López-Martínez, J.
Maestro, A.
Gil, A.
Schmid, T.
Lambán, L.J.
Galé, C.
Ubide, T.
Lago, M.
author2_role author
author
author
author
author
author
author
author
description Studying the magnetic fabric in volcanic edifices, particularly lava flows from recent eruptions, allows us to understand the orientation distribution of the minerals related to the flow direction and properly characterize older and/or eroded flows. In this work, the magnetic fabric from recent (Quaternary) lava flows (slightly inclined in seven sites and plateau lavas in two sites), pyroclastic deposits (two sites from a scoria cone) and volcanic cones, domes and plugs (three sites) from Penguin and Bridgeman islands, located in the Bransfield backarc basin, are presented. The volcanism in the two islands is related to rifting occurring due to the opening of the Bransfield Strait, between the South Shetlands archipelago and the Antarctic Peninsula. The direction of flow of magmatic material is unknown. Rock magnetic analyses, low temperature measurements and electron microscope observations (back-scattered electron imaging and Energy Dispersive X-ray analyses) reveal a Ti-poor magnetite (and maghemite) as the main carrier of the magnetic fabric. Hematite may be present in some samples. Samples from the centre of the lavas reveal a magnetic lineation either parallel or imbricated with respect to the flow plane, whereas in the plateau lavas the magnetic lineation is contained within the subhorizontal plane except in vesicle-rich samples, where imbrication occurs. The magnetic lineation indicates a varied flow direction in Bridgeman Island with respect to the spreading Bransfield Basin axis. The flow direction in the plateau lavas on Penguin Island is deduced from the imbrication of the magnetic fabric in the more vesicular parts, suggesting a SE-NW flow. The volcanic domes are also imbricated with respect to an upward flow, and the bombs show scattered distribution.
publishDate 2021
dc.date.none.fl_str_mv 2021
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dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/118058
url http://zaguan.unizar.es/record/118058
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/MINECO/CTM2014-57119-R
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
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