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Physical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Morocco

2020-01-15Journal article Open access
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dc.contributor.authorEl Hachimi, Hind
dc.contributor.authorYoubi, Nasrrddine
dc.contributor.authorMadeira, José
dc.contributor.authorMarzoli, Andrea
dc.contributor.authorMata, João
dc.contributor.authorBertrand, Hervé
dc.contributor.authorBensalah, Mohamed Khalil
dc.contributor.authorBoumehdi, Moulay Ahmed
dc.contributor.authorDoblas, Miguel
dc.contributor.authorMedina, Fida
dc.contributor.authorBen Abbou, Mohamed
dc.contributor.authorMartins, Línia
dc.date.accessioned2022-02-28T14:10:20Z
dc.date.available2022-02-28T14:10:20Z
dc.date.issued2020-01-15
dc.description.abstractThe best preserved and most complete lava flow sequences of the Central Atlantic Magmatic Province (CAMP) in Morocco are exposed in the Central High Atlas and can reach up to 300 m in thickness. Four distinct formations, emplaced in subaerial environments, are classically recognized: the Lower, Intermediate, Upper and Recurrent formations. These formations are separated by paleosoils and sedimentary sequences (mudstones, siltstones, sandstones, limestones), that are in general less than two meter-thick and may exceptionally reach a thickness of 80 m, representing minor periods of volcanic quiescence. CAMP lava flows of the Central High Atlas can be grouped into two main categories: subaerial compound pahoehoe flows and simple flows. The former type is exclusively confined to the Lower and Intermediate Formations, while simple flows occur in the Upper and Recurrent Formations. The dominance of compound flows in the two lowermost units of the CAMP suggests a slow emplacement during successive sustained eruptive episodes. Instead the thick single flows characterizing the Upper and Recurrent units indicate higher effusive rates. Basaltic pillow lavas (always of short lateral extent: 10 to 100 m), showing radial jointing and vitreous rinds, identical to those found in the Western Meseta, are occasionally associated with hyaloclastites in the base of the Intermediate Formation, immediately above clastic sediments, or in the Upper Formation. The occurrence of pillow lavas does not imply a generalized subaqueous environment at the time of the lava emission. Instead, they represent subaerial flows that entered small lakes occupying depressions on the volcanic topography of the Lower and Intermediate Formations. The short lateral extent of the pillow lavas and their constant stratigraphic position, the existence of lava flows with unequivocal subaerial characteristics associated to sediments containing fossilized wood, clearly indicate onshore emplacement.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5802/crgeos.7pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/51538
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAcadémie des Sciences, Parispt_PT
dc.relationBilateral Cooperation project FCT (Portugal)-CNRST (Morocco) to José Madeira, João Mata, Línia Martins, and Nasrrddine Youbipt_PT
dc.relationFCT/UID/GEO/50019/2019 by FCTpt_PT
dc.relation.publisherversionhttps://comptes-rendus.academie-sciences.fr/geoscience/item/10.5802/crgeos.7.pdfpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectNATURAL SCIENCESpt_PT
dc.subjectEarth sciencespt_PT
dc.titlePhysical volcanology and emplacement mechanism of the Central Atlantic Magmatic Province (CAMP) lava flows from the Central High Atlas, Moroccopt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage473pt_PT
oaire.citation.issue6-7pt_PT
oaire.citation.startPage455pt_PT
oaire.citation.titleComptes Rendus. Géosciencept_PT
oaire.citation.volume352pt_PT
person.familyNameYoubi
person.familyNamede Oliveira Madeira
person.familyNameMata
person.familyNameBensalah
person.familyNameBoumehdi
person.familyNameMartins
person.givenNameNasrrddine
person.givenNameJosé Eduardo
person.givenNameJoão
person.givenNameMohamed Khalil
person.givenNameMoulay Ahmed
person.givenNameLínia
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person.identifier.scopus-author-id7102806167
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person.identifier.scopus-author-id7102109333
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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