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Composition of lower cretaceous mudstones of the Algarve basin and implications for Iberian palaeoclimates

2020-06Journal article Restricted access
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dc.contributor.authorDinis, Pedro A.
dc.contributor.authorCarvalho, Joel
dc.contributor.authorCallapez, Pedro M.
dc.contributor.authorMendes, Mario Miguel
dc.contributor.authorSantos, Vanda F.
dc.contributor.authorManuel Carvalho Fernandes, Paulo
dc.date.accessioned2021-06-24T11:35:32Z
dc.date.available2021-06-24T11:35:32Z
dc.date.issued2020-06
dc.description.abstractSeveral compositional features of mudstones are controlled by climate-driven weathering and have been used to approximate palaeoclimatic conditions. Mudstone composition, however, is also influenced by the geology of the source areas and diverse depositional and post-depositional processes. The present geochemical and mineralogical study of the Lower Cretaceous (upper Hauterivian to Aptian) of the Algarve Basin (Southern Portugal) was performed to investigate the main factors that control mudstone composition and extract possible climatic signals. Clay mineralogy partially reflects diverse contributions of felsic vs. mafic and recycled materials, and the geochemical weathering proxies applied to the detrital component of mudstones are differently affected by provenance and hydraulic fractionation. Despite these facts, a wide set of compositional data allows some robust climatic interpretations. Apart from the early Aptian (Burgau Formation), when climate was probably wetter, hot and dry conditions prevailed in south Iberia during the investigated interval, with minimum humidity during the late Hauterivianeearly Barremian (Salema Formation). Independent sedimentological and palaeontogical data support these interpretations. A comparison with compositional results for the Lusitanian Basin reveals substantially drier climates in southern than central and northern Iberia. Interpreted patterns of climatic evolution can be linked to shifts in air circulation from the sub-tropical high-pressure belt. (C) 2020 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipFCT (Portuguese National Board of Scientific Research) through the Strategic Program MARE-Marine and Environmental Sciences Centre [UID/MAR/04292/2013]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.cretres.2020.104404
dc.identifier.issn0195-6671
dc.identifier.urihttp://hdl.handle.net/10400.1/16470
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectEarly cretaceous
dc.subjectAlgarve basin
dc.subjectClay mineralogy
dc.subjectGeochemistry
dc.subjectPalaeoclimate
dc.subjectProvenance
dc.subject.otherGeology
dc.titleComposition of lower cretaceous mudstones of the Algarve basin and implications for Iberian palaeoclimates
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.startPage104404
oaire.citation.titleCretaceous Research
oaire.citation.volume110
oaire.fundingStream5876
person.familyNameFernandes
person.givenNamePaulo
person.identifier422469
person.identifier.ciencia-id051D-A133-65D9
person.identifier.orcid0000-0003-4888-0230
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id57197129025
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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