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The effect of speleothem surface slope on the remanent magnetic inclination

2017Journal article Open access
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dc.contributor.authorPonte, J. M.
dc.contributor.authorFont, E.
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorHillaire-Marcel, C.
dc.contributor.authorGhaleb, B.
dc.date.accessioned2018-01-05T19:59:05Z
dc.date.available2018-01-05T19:59:05Z
dc.date.issued2017
dc.date.updated2018-01-05T10:49:37Z
dc.description.abstractSpeleothems are of interest for high-resolution reconstruction of the Earth's magnetic field. However, little is known about the influence of speleothem morphologies on their natural remanent magnetization (NRM) record. Here we report on a high-resolution paleomagnetic study of a dome-shaped speleothem of middle Holocene age from southern Portugal, with special attention to the anisotropy of magnetic susceptibility (AMS) and anisotropy of anhysteretic remanent magnetization (AARM). To assess the potential influence of the slope of the speleothem surface on the recorded remanent magnetization, we compare magnetic directions and AMS and AARM fabrics from subhorizontal to gradually subvertical calcite growth layers collected in a transversal cross section of the speleothem. A linear correlation is observed between magnetic inclinations, calcite laminae slope, and AARM k1 inclination. The AMS fabric is mostly controlled by calcite crystals, with direction of the minimum axes (k3) perpendicular to laminae growth. Magnetic inclinations recorded in inclined and vertical calcite growth layers are underestimated when compared to a global paleosecular variation (PSV) model. After extrapolating magnetic inclinations to the horizontal, the corrected data better fit the PSV model but are still lower than the predicted magnetic inclinations, suggesting that inclination shallowing affects the entire speleothem. We suggest that speleothem morphology exerts a critical role on the magnetic inclination recording, which is controlled by the Earth's magnetic field but also influenced by particle rolling along the sloping surfaces. These observations open new avenues for reconstructing high-resolution paleomagnetic secular variation records from speleothems and provide new insights into their NRM acquisition mechanisms.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier21699313en_US
dc.identifier.citationPonte, J. M.; Font, E.; VEIGA-PIRES, C; Hillaire-Marcel, C.; Ghaleb, B.The effect of speleothem surface slope on the remanent magnetic inclination, Journal of Geophysical Research: Solid Earth, 122, 6, 4143-4156, 2017.pt_PT
dc.identifier.doi10.1002/2016JB013789
dc.identifier.issn2169-9313
dc.identifier.otherAUT: CVP01371;
dc.identifier.urihttp://hdl.handle.net/10400.1/10290
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.relation.publisherversionhttp://onlinelibrary.wiley.com/doi/10.1002/2016JB013789/fullpt_PT
dc.titleThe effect of speleothem surface slope on the remanent magnetic inclinationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage4156pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage4143pt_PT
oaire.citation.titleJournal of Geophysical Research. Solid Earthpt_PT
oaire.citation.volume122pt_PT
person.familyNameVeiga-Pires
person.givenNameCristina
person.identifier113325
person.identifier.ciencia-id4A1F-CEDA-E66C
person.identifier.orcid0000-0002-9323-0723
person.identifier.ridB-5144-2008
person.identifier.scopus-author-id7801372905
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd1541efa-0eaa-48dc-aea3-a1e64aa0065a
relation.isAuthorOfPublication.latestForDiscoveryd1541efa-0eaa-48dc-aea3-a1e64aa0065a

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