The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources

Mantle xenoliths provide our clearest look at the magnetic mineral assemblages below the Earth's crust. Previous investigations of mantle xenoliths suggested the absence of magnetite and metals, and proposed that even if such minerals were present, they would be above their Curie temperatures a...

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Detalles Bibliográficos
Autores: Ferré, Eric E., Friedman, Sarah A., Martín Hernández, Fátima, Feinberg, Joshua M., Conder, James A., Ionov, Dmitri A.
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/76900
Acceso en línea:http://hdl.handle.net/10261/76900
Access Level:acceso abierto
Palabra clave:Mantle
Magnetic sources
Peridotite
Natural remanent magnetism
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spelling The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sourcesFerré, Eric E.Friedman, Sarah A.Martín Hernández, FátimaFeinberg, Joshua M.Conder, James A.Ionov, Dmitri A.MantleMagnetic sourcesPeridotiteNatural remanent magnetismMantle xenoliths provide our clearest look at the magnetic mineral assemblages below the Earth's crust. Previous investigations of mantle xenoliths suggested the absence of magnetite and metals, and proposed that even if such minerals were present, they would be above their Curie temperatures at mantle conditions. Here we use magnetic measurements to examine four exceptionally fresh suites of xenoliths, and show that magnetite occurs systematically, albeit in variable amounts depending on the tectonic setting. Specimens from low geotherm regions hold the largest magnetic remanence. Petrographic evidence shows that this magnetite did not form through serpentinization or other alteration processes. Magnetite, which is generally stable at the P-T-fO2 conditions in the uppermost mantle, had to have formed either in the mantle or, less likely, in the volcanic conduit. In some cases, the source of the xenoliths was at temperatures <600 °C, which may have allowed this portion of the lithospheric mantle to carry a magnetic remanence. Whether such magnetite carries a remanent magnetization or is simply the source of a strong induced magnetization, these new results suggest that the concept of the Moho as a major magnetic boundary needs to be revisited.Peer reviewedAmerican Geophysical Union201320132013info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/76900reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1002/grl.50109info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/769002026-05-22T06:33:51Z
dc.title.none.fl_str_mv The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
title The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
spellingShingle The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
Ferré, Eric E.
Mantle
Magnetic sources
Peridotite
Natural remanent magnetism
title_short The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
title_full The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
title_fullStr The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
title_full_unstemmed The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
title_sort The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources
dc.creator.none.fl_str_mv Ferré, Eric E.
Friedman, Sarah A.
Martín Hernández, Fátima
Feinberg, Joshua M.
Conder, James A.
Ionov, Dmitri A.
author Ferré, Eric E.
author_facet Ferré, Eric E.
Friedman, Sarah A.
Martín Hernández, Fátima
Feinberg, Joshua M.
Conder, James A.
Ionov, Dmitri A.
author_role author
author2 Friedman, Sarah A.
Martín Hernández, Fátima
Feinberg, Joshua M.
Conder, James A.
Ionov, Dmitri A.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Mantle
Magnetic sources
Peridotite
Natural remanent magnetism
topic Mantle
Magnetic sources
Peridotite
Natural remanent magnetism
description Mantle xenoliths provide our clearest look at the magnetic mineral assemblages below the Earth's crust. Previous investigations of mantle xenoliths suggested the absence of magnetite and metals, and proposed that even if such minerals were present, they would be above their Curie temperatures at mantle conditions. Here we use magnetic measurements to examine four exceptionally fresh suites of xenoliths, and show that magnetite occurs systematically, albeit in variable amounts depending on the tectonic setting. Specimens from low geotherm regions hold the largest magnetic remanence. Petrographic evidence shows that this magnetite did not form through serpentinization or other alteration processes. Magnetite, which is generally stable at the P-T-fO2 conditions in the uppermost mantle, had to have formed either in the mantle or, less likely, in the volcanic conduit. In some cases, the source of the xenoliths was at temperatures <600 °C, which may have allowed this portion of the lithospheric mantle to carry a magnetic remanence. Whether such magnetite carries a remanent magnetization or is simply the source of a strong induced magnetization, these new results suggest that the concept of the Moho as a major magnetic boundary needs to be revisited.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/76900
url http://hdl.handle.net/10261/76900
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1002/grl.50109
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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