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Evidences for multiple remagnetization of Proterozoic dykes from Iguerda inlier (Anti-Atlas Belt, Southern Morocco)

2016-10Journal article Restricted access
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dc.contributor.authorNeres, Marta
dc.contributor.authorSilva, Pedro
dc.contributor.authorIkenne, Moha
dc.contributor.authorMartins, Sofia
dc.contributor.authorHafid, Ahmid
dc.contributor.authorMata, João
dc.contributor.authorAlmeida, Francisco
dc.contributor.authorYoubi, Nasrrddine
dc.contributor.authorBoumehdi, Moulay Ahmed
dc.date.accessioned2019-02-21T11:39:28Z
dc.date.available2019-02-21T11:39:28Z
dc.date.issued2016-10
dc.description.abstractNo paleomagnetic data exist for Paleo-Mesoproterozoic times of the West African Craton (WAC). Therefore, paleogeographic reconstructions for such old geological times are difficult to constrain. Gaps on the sedimentary record and intense remagnetizations are the major problems that paleomagnetic studies come across. Recent geochronological results for dyke swarms that intrude several Proterozoic inliers of WAC in the Anti-Atlas Belt (southern Morocco) revealed ages between Paleoproterozoic and early Neoproterozoic, opening for the first time a window of opportunity to conduct paleomagnetic studies and tentatively infer about the paleoposition of WAC during Proterozoic. On this scope we conducted a paleomagnetic study on seven Proterozoic dykes of the Iguerda inlier. The meaning of the obtained paleomagnetic directions was evaluated by rock magnetic and mineral analyses, complemented by petrographic observations. Our samples record the presence of a complex history of remagnetization, mostly assigned to several Phanerozoic thermal/ chemical events, in particular to the late stages of Pan African orogeny (s.l.), to the Late Carboniferous Variscan orogeny, and even to more recent events. The recognized remagnetization processes are related to widespread metamorphic events under greenschist facies followed by low-temperature oxidation, both responsible for the formation of new magnetic phases, like magnetite and hematite. These events obliterated the primary (magmatic) thermo-remanent magnetization and promoted multiple remagnetizations of the dykes, thermally and chemically. For only one dyke the presence of primary magnetization is possible to infer, though not to confirm, and would place WAC at an equatorial position around 1750 Ma.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationNERES, Marta; [et al] – Evidences for multiple remagnetization of Proterozoic dykes from Iguerda inlier (Anti-Atlas Belt, Southern Morocco). Studia Geophysica et Geodaetica. ISSN 0039-3169. Vol. 60, N.º 4 (2016), pp. 700-730pt_PT
dc.identifier.doi10.1007/s11200-014-0178-xpt_PT
dc.identifier.issn0039-3169
dc.identifier.issn1573-1626
dc.identifier.urihttp://hdl.handle.net/10400.21/9557
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationSDU 02/2012-2015 - Academy Hassan II for Science and Technology of the Kingdom of Moroccopt_PT
dc.relation.publisherversionhttps://link.springer.com/content/pdf/10.1007%2Fs11200-014-0178-x.pdfpt_PT
dc.subjectWest African Craton (WAC)pt_PT
dc.subjectDyke swarmspt_PT
dc.subjectPaleomagnetismpt_PT
dc.subjectRemagnetizationpt_PT
dc.subjectProterozoicpt_PT
dc.subjectPan-Africanpt_PT
dc.subjectAnti-Atlaspt_PT
dc.titleEvidences for multiple remagnetization of Proterozoic dykes from Iguerda inlier (Anti-Atlas Belt, Southern Morocco)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage730pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage700pt_PT
oaire.citation.titleStudia Geophysica et Geodaeticapt_PT
oaire.citation.volume60pt_PT
person.familyNameMaria de Almeida Neres
person.familyNameSilva
person.familyNameMartins
person.familyNameMata
person.familyNameYoubi
person.familyNameBoumehdi
person.givenNameMarta
person.givenNamePedro
person.givenNameSofia
person.givenNameJoão
person.givenNameNasrrddine
person.givenNameMoulay Ahmed
person.identifier1232178
person.identifier91834
person.identifier.ciencia-idDB12-EFB0-9302
person.identifier.ciencia-idC314-1157-FD0C
person.identifier.ciencia-id4312-8A60-15E3
person.identifier.orcid0000-0003-3939-4636
person.identifier.orcid0000-0002-9178-3623
person.identifier.orcid0000-0002-0039-3153
person.identifier.orcid0000-0001-5769-7708
person.identifier.orcid0000-0003-3466-2400
person.identifier.orcid0000-0001-5084-1551
person.identifier.ridB-8512-2008
person.identifier.ridK-9273-2015
person.identifier.ridI-3352-2012
person.identifier.ridD-2425-2010
person.identifier.scopus-author-id55431034700
person.identifier.scopus-author-id7102806167
person.identifier.scopus-author-id6602513225
person.identifier.scopus-author-id56437635400
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscovery54c96e27-8c3a-42d9-b751-ebc637c2f478

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