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Heterogeneity of the mixed siliciclastic-carbonate deposits of the upper Cabo Carvoeiro formation (Lower-Middle Jurassic), Lusitanian Basin, Portugal

2025-04Journal article Open access
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorBarata, Joao
dc.contributor.authorDuarte, Luis
dc.contributor.authorAzerêdo, Ana Cristina
dc.contributor.authorGomes, J.
dc.date.accessioned2025-05-16T13:38:56Z
dc.date.available2025-05-16T13:38:56Z
dc.date.issued2025-04
dc.description.abstractABSTRACT: The upper CC5 member of the Cabo Carvoeiro Formation (Toarcian-Aalenian(?)) of the Lusitanian Basin is characterized by grainstone facies with quartz grains, ooids and intraclasts. These facies are observed exclusively at Peniche, contrasting with the hemipelagic marly sediments of coeval outcrop sections in the basin. A detailed facies scheme reveals the relative local heterogeneity of the succession on outcrops, while the analysed subsurface data helps to better understand its regional heterogeneity. Lateral facies variability on outcrop is observed to occur through gradation, interfingering or pinching-out geometries. Coeval sections in the analysed offshore wells are generally characterized by micritic mudstone facies, which might transition laterally into the Peniche grainstones through similar geometric relationships based on the existing conceptual model. The relative heterogeneity of this sedimentary system is defined in this study by integrating outcrop and subsurface data, allowing for its perception at different observation scales.eng
dc.description.abstractRESUMO: O topo do membro CC5 da Formação do Cabo Carvoeiro (Toarciano-Aaleniano(?)) na Bacia Lusitânica caracteriza-se por fácies grainstone com intraclastos, oóides e grãos de quartzo. Estas observam-se exclusivamente em Peniche, contrastando com os sedimentos margosos hemipelágicos das secções coevas da bacia e as fácies micríticas das sondagens offshore. Um esquema de fácies detalhado revela a heterogeneidade da sucessão em afloramento, sendo que os dados de sondagem ajudam a definir a heterogeneidade do sistema à escala regional. Em afloramento, a variabilidade lateral de fácies ocorre através de gradação, interdigitação ou bizelamento de corpos. As secções coevas das sondagens analisadas caracterizam-se na generalidade por fácies micríticas mudstone. Estas passam lateralmente às fácies grainstone de Peniche através de relações geométricas semelhantes, de acordo com o modelo concetual. A heterogeneidade do sistema descreve-se através da análise integrada de dados de afloramento e subsuperfície, permitindo a perceção dessa variabilidade a diferentes escalas.por
dc.identifier.citationBarata, J., Duarte, L. V., Azerêdo, A. C. & Gomes, J. (2025). Heterogeneity of the mixed siliciclastic-carbonate deposits of the upper Cabo Carvoeiro formation (Lower-Middle Jurassic), Lusitanian Basin, Portugal. In: Comunicações Geológicas, 2025, vol.112, Fascículo Especial I, pp. 51-55. https://doi.org/10.34637/2gqg-qy54
dc.identifier.doi10.34637/2gqg-qy54
dc.identifier.eissn1647-581X
dc.identifier.issn0873-948X
dc.identifier.urihttp://hdl.handle.net/10400.9/5687
dc.language.isoeng
dc.peerreviewedyes
dc.publisherLNEG - Laboratório Nacional de Energia e Geologia
dc.relationMarine and Environmental Sciences Centre
dc.relationAquatic Research Infrastructure Network
dc.relationInstituto Dom Luiz
dc.relation.hasversionhttps://www.lneg.pt/wp-content/uploads/2025/04/08_Barata-et-al.pdf
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectCarbonate heterogeneity
dc.subjectPetrographic analysis
dc.subjectJurassic
dc.subjectLusitanian Basin
dc.subjectPortugal
dc.subjectHeterogeneidade de depósitos carbonatados
dc.subjectAnálise petrográfica
dc.subjectJurássico
dc.titleHeterogeneity of the mixed siliciclastic-carbonate deposits of the upper Cabo Carvoeiro formation (Lower-Middle Jurassic), Lusitanian Basin, Portugaleng
dc.title.alternativeHeterogeneidade da sucessão siliciclástico-carbonatada do topo da formação de Cabo Carvoeiro (transição Jurássico Inferior-Médio), Bacia Lusitânica, Portugalpor
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMarine and Environmental Sciences Centre
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04292%2F2020/PT
oaire.awardURIhttp://hdl.handle.net/10400.9/5686
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.endPage55
oaire.citation.startPage51
oaire.citation.titleComunicações Geológicas
oaire.citation.volume112
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameBarata
person.familyNameDuarte
person.givenNameJoao
person.givenNameLuis
person.identifier.orcid0000-0001-6061-1557
person.identifier.orcid0000-0002-9025-5896
person.identifier.ridF-5282-2013
person.identifier.scopus-author-id7005630206
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
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Volume 112 (2025) Fascículo Especial I - XI Congresso Nacional de Geologia