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Preliminary results of a study of magnetic properties in the Foum-Zguid dyke (Morocco)

2004Journal article Open access
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dc.contributor.authorSilva, P. F.
dc.contributor.authorMarques, F. O.
dc.contributor.authorHenry, B.
dc.contributor.authorMateus, A.
dc.contributor.authorLourenço, Nuno
dc.contributor.authorMiranda, J. M.
dc.date.accessioned2018-12-07T14:58:39Z
dc.date.available2018-12-07T14:58:39Z
dc.date.issued2004
dc.description.abstractThis work focuses on the study of flow and propagation of magma using rock magnetic analyses along sections across the thick Jurassic dyke of Foum-Zguid (Southern Morocco). Thermomagnetic data show that Ti-poor titanomagnetite is the main magnetic carrier. Petrographic analysis shows that the main Ti phase (ilmenite) occurs either as lamellae within spinel (center of the dyke) or as isolated grains (dyke margin). Bulk magnetic properties display distinct behavior according to the distance to the dyke margin; grain size of the main magnetic carrier decreases towards the center of the dyke, while the natural remanent magnetization and the bulk magnetic susceptibility increase. Only the magnetic susceptibility ellipsoid close to the dyke margin corresponds to that usually found in thin dykes, with the magnetic foliation sub parallel to dyke margins. Maximum principal axis is in most cases either parallel or perpendicular to the intersection between the planes of magnetic foliation and dyke wall. Moreover, when this axis is perpendicular to the intersection it is associated with a more oblate magnetic susceptibility ellipsoid shape, indicating the presence of complex magnetic fabrics. The studied magnetic properties show that, in this 100 m wide thick dyke, flow structures related with dyke propagation are only preserved close to the quickly cooled dyke margins. (C) 2004 Elsevier Ltd. All rights reserved.
dc.identifier.doi10.1016/j.pce.2004.01.016
dc.identifier.issn1474-7065
dc.identifier.urihttp://hdl.handle.net/10400.1/12135
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPergamon-Elsevier Science Ltd
dc.relationExperimental and Theoretical Modelling of Geological Processes - GEOMODELS2001
dc.relationTECTONIC AND MAGNETIC MODELLING OF MAGMATIC INTRUSIONS: APPLIED TO THE IBERO ARMORICAN ARC - TEAMINT
dc.subjectMagma flow directions
dc.subjectHysteresis properties
dc.subjectTroodos ophiolite
dc.subjectSwarm brittany
dc.subjectGrain-size
dc.subjectSusceptibility
dc.subjectAnisotropy
dc.subjectDikes
dc.subjectRocks
dc.subjectIntrusions
dc.titlePreliminary results of a study of magnetic properties in the Foum-Zguid dyke (Morocco)
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleExperimental and Theoretical Modelling of Geological Processes - GEOMODELS2001
oaire.awardTitleTECTONIC AND MAGNETIC MODELLING OF MAGMATIC INTRUSIONS: APPLIED TO THE IBERO ARMORICAN ARC - TEAMINT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FCTA%2F38695%2F2001/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FCTA%2F48137%2F2002/PT
oaire.citation.conferencePlaceNice, France
oaire.citation.endPage920
oaire.citation.issue13-14
oaire.citation.startPage909
oaire.citation.titlePhysics and Chemistry of the Earth parts A/B/C
oaire.citation.titleJoint Assembly of the Egs/Agu/Eug
oaire.citation.volume29
oaire.fundingStreamPOCI
oaire.fundingStreamPOCI
person.familyNameLourenço
person.givenNameNuno
person.identifier.ciencia-id4A13-CD1F-7BEE
person.identifier.orcid0000-0002-8038-677X
person.identifier.ridA-5361-2013
person.identifier.scopus-author-id57216555279
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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