Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations

Magnetic hysteresis measurements of sediments have resulted in widespread reporting of “pseudo‐single‐domain”‐like magnetic properties. In contrast, the ideal single domain (SD) properties that would be expected to be responsible for high quality paleomagnetic records are rare. Determining whether S...

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Detalles Bibliográficos
Autores: Roberts, Andrew P., Liao, Chang, Heslop, David, Florindo, Fabio, Larrasoaña, Juan C.
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/276742
Acceso en línea:http://hdl.handle.net/10261/276742
https://doi.org/10.1029/2012JB009412
Access Level:acceso abierto
Palabra clave:magnetita
magnetismo
histérisis magnética
propiedad magnética
Paleomagnetismo
dominio magnético simple
sedimento biogénico
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spelling Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinationsRoberts, Andrew P.Liao, ChangHeslop, DavidFlorindo, FabioLarrasoaña, Juan C.magnetitamagnetismohistérisis magnéticapropiedad magnéticaPaleomagnetismodominio magnético simplesedimento biogénicoMagnetic hysteresis measurements of sediments have resulted in widespread reporting of “pseudo‐single‐domain”‐like magnetic properties. In contrast, the ideal single domain (SD) properties that would be expected to be responsible for high quality paleomagnetic records are rare. Determining whether SD particles are rare or common in sediments requires application of techniques that enable discrimination among different magnetic components in a sediment. We apply a range of such techniques and find that SD particles are much more common than has been reported in the literature and that magnetite magnetofossils (the inorganic remains of magnetotactic bacteria) are widely preserved at depth in a range of sediment types, including biogenic pelagic carbonates, lacustrine and marine clays, and possibly even in glaci‐marine sediments. Thus, instead of being rarely preserved in the geological record, we find that magnetofossils are widespread. This observation has important implications for our understanding of how sediments become magnetized and highlights the need to develop a more robust basis for understanding how biogenic magnetite contributes to the magnetization of sediments. Magnetofossils also have grain sizes that are substantially smaller than the 1–15μm size range for which there is reasonable empirical support for relative paleointensity studies. The different magnetic response of coexisting fine biogenic and coarser lithogenic particles is likely to complicate relative paleointensity studies. This issue needs much closer attention. Despite the fact that sediments have been subjected to paleomagnetic investigation for over 60 years, much remains to be understood about how they become magnetizedNational Oceanography Centre, University of Southampton, Reino UnidoResearch School of Earth Sciences, Australian National University, AustraliaPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, University of Utrecht, HolandaIstituto Nazionale di Geofisica e Vulcanologia, ItaliaUnidad de Zaragoza, Área de Cambio Global, Instituto Geológico y Minero de España, EspañaAmerican Geophysical UnionNatural Environment Research Council (UK)Australian Research CouncilMinisterio de Educación y Cultura (España)202220222012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/276742https://doi.org/10.1029/2012JB009412reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#NE/G003319/1DP120103952PR2011–0480https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2012JB009412info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2767422026-05-22T06:33:51Z
dc.title.none.fl_str_mv Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
title Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
spellingShingle Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
Roberts, Andrew P.
magnetita
magnetismo
histérisis magnética
propiedad magnética
Paleomagnetismo
dominio magnético simple
sedimento biogénico
title_short Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
title_full Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
title_fullStr Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
title_full_unstemmed Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
title_sort Searching for single domain magnetite in the “pseudo-single-domain” sedimentary haystack: implications of biogenic magnetite preservation for sediment magnetism and relative paleointensity determinations
dc.creator.none.fl_str_mv Roberts, Andrew P.
Liao, Chang
Heslop, David
Florindo, Fabio
Larrasoaña, Juan C.
author Roberts, Andrew P.
author_facet Roberts, Andrew P.
Liao, Chang
Heslop, David
Florindo, Fabio
Larrasoaña, Juan C.
author_role author
author2 Liao, Chang
Heslop, David
Florindo, Fabio
Larrasoaña, Juan C.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Natural Environment Research Council (UK)
Australian Research Council
Ministerio de Educación y Cultura (España)
dc.subject.none.fl_str_mv magnetita
magnetismo
histérisis magnética
propiedad magnética
Paleomagnetismo
dominio magnético simple
sedimento biogénico
topic magnetita
magnetismo
histérisis magnética
propiedad magnética
Paleomagnetismo
dominio magnético simple
sedimento biogénico
description Magnetic hysteresis measurements of sediments have resulted in widespread reporting of “pseudo‐single‐domain”‐like magnetic properties. In contrast, the ideal single domain (SD) properties that would be expected to be responsible for high quality paleomagnetic records are rare. Determining whether SD particles are rare or common in sediments requires application of techniques that enable discrimination among different magnetic components in a sediment. We apply a range of such techniques and find that SD particles are much more common than has been reported in the literature and that magnetite magnetofossils (the inorganic remains of magnetotactic bacteria) are widely preserved at depth in a range of sediment types, including biogenic pelagic carbonates, lacustrine and marine clays, and possibly even in glaci‐marine sediments. Thus, instead of being rarely preserved in the geological record, we find that magnetofossils are widespread. This observation has important implications for our understanding of how sediments become magnetized and highlights the need to develop a more robust basis for understanding how biogenic magnetite contributes to the magnetization of sediments. Magnetofossils also have grain sizes that are substantially smaller than the 1–15μm size range for which there is reasonable empirical support for relative paleointensity studies. The different magnetic response of coexisting fine biogenic and coarser lithogenic particles is likely to complicate relative paleointensity studies. This issue needs much closer attention. Despite the fact that sediments have been subjected to paleomagnetic investigation for over 60 years, much remains to be understood about how they become magnetized
publishDate 2012
dc.date.none.fl_str_mv 2012
2022
2022
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/10261/276742
https://doi.org/10.1029/2012JB009412
url http://hdl.handle.net/10261/276742
https://doi.org/10.1029/2012JB009412
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
NE/G003319/1
DP120103952
PR2011–0480
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2012JB009412
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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