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Variation of magnetic properties in sedimentary rocks hosting the Foum Zguid dyke (southern Morocco): combined effects of re-crystallization and Fe-metasomatism

2006-01Journal article Restricted
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dc.contributor.authorSilva, P. F.
dc.contributor.authorHenry, B.
dc.contributor.authorMarques, F. O.
dc.contributor.authorMateus, A.
dc.contributor.authorMadureira, P.
dc.contributor.authorLourenco, N.
dc.contributor.authorMiranda, J. M.
dc.date.accessioned2018-12-07T14:53:11Z
dc.date.available2018-12-07T14:53:11Z
dc.date.issued2006-01
dc.description.abstractThe effects of dyke intrusion on the magnetic properties of host sedimentary rocks are still poorly understood. Therefore, we have evaluated bulk magnetic parameters of standard palaeomagnetic samples collected along several sections across the sediments hosting the Foum Zguid dyke in southern Morocco. The study has been completed with the evaluation of the magnetic fabric after laboratory application of sequential heating experiments. The present study shows that: (1) close to Fourn Zguid dykes, the variations of the bulk magnetic parameters and of the magnetic fabric is strongly related with re-crystallization and Fe-metasomatism intensity. (2) The thermal experiments on AMS of samples collected farther from the dyke and, thus, less affected by heating during dyke emplacement, indicate that 300-400 degrees C is the minimum experimental temperature necessary to trigger appreciable transformations of the pre-existing magnetic fabrics. For temperatures higher than ca. 580 degrees C, the magnetic fabric transformations are fully realized, with complete transposition of the initial fabric to a fabric similar to that of samples collected close to the dyke. Therefore, measured variations of the magnetic fabric can be used to evaluate re-crystallization temperatures experienced by the host sedimentary rock during dyke emplacement. The distinct magnetic behaviour observed along the cross-sections strongly suggests that samples collected farther from the dyke margins did not experience thermal episodes with temperatures higher than 300 degrees C after dyke emplacement. (3) AMS data shows a gradual variation of the magnetic fabric with distance from the dyke margin, from sub-horizontal K-3 away from the dyke to vertical K3 close to the dyke. Experimental heating shows that heat alone can be responsible for this strong variation. Therefore, such orientation changes should not be unequivocally interpreted as the result of a stress field (resulting from the emplacement of the dyke, for instance). (4) Magnetic studies prove to be a very sensitive tool to assess rock magnetic transformations, thermally and chemically induced by dyke intrusion in hosting sediments. (c) 2005 Elsevier B.V. All rights reserved.
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.epsl.2005.10.009
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/10400.1/11394
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectThermal enhancement
dc.subjectAnti-atlas
dc.subjectSusceptibility
dc.subjectAnisotropy
dc.subjectTemperature
dc.subjectSandstones
dc.subjectOrigin
dc.titleVariation of magnetic properties in sedimentary rocks hosting the Foum Zguid dyke (southern Morocco): combined effects of re-crystallization and Fe-metasomatism
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage992
oaire.citation.issue03-abr
oaire.citation.startPage978
oaire.citation.titleEarth and Planetary Science Letters
oaire.citation.volume241
person.familyNameSilva
person.familyNameMateus
person.familyNameMadureira
person.familyNameLourenço
person.givenNamePedro
person.givenNameAntónio
person.givenNamePedro Miguel
person.givenNameNuno
person.identifier.ciencia-idC314-1157-FD0C
person.identifier.ciencia-id3012-5AFF-429F
person.identifier.ciencia-idBD11-66D7-5BC3
person.identifier.ciencia-id4A13-CD1F-7BEE
person.identifier.orcid0000-0002-9178-3623
person.identifier.orcid0000-0003-2623-1539
person.identifier.orcid0000-0003-4762-6273
person.identifier.orcid0000-0002-8038-677X
person.identifier.ridB-8512-2008
person.identifier.ridD-3727-2011
person.identifier.ridA-5361-2013
person.identifier.scopus-author-id55431034700
person.identifier.scopus-author-id6701374691
person.identifier.scopus-author-id24503642500
person.identifier.scopus-author-id57216555279
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication08048279-ef28-4617-878d-3860a86cbe93
relation.isAuthorOfPublication88239666-0934-4a0d-881d-26ba1bda5e95
relation.isAuthorOfPublication0e5f36bb-a904-41d3-8bd9-8acd132dc808
relation.isAuthorOfPublication.latestForDiscovery88239666-0934-4a0d-881d-26ba1bda5e95

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