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The palynology of the Upper Triassic-Lower Jurassic in the Algarve and Lusitanian basins, Portugal

2026-07Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorVilas Boas, Margarida
dc.contributor.authorCirilli, Simonetta
dc.contributor.authorPereira, Zélia
dc.contributor.authorDuarte, Luis
dc.contributor.authorFernandes, Paulo
dc.date.accessioned2026-07-08T14:54:51Z
dc.date.available2026-07-08T14:54:51Z
dc.date.issued2026-07
dc.description.abstractABSTRACT: High-resolution palynological analyses from the Algarve and Lusitanian basins (Portugal) provide a refined biostratigraphical framework and palaeoenvironmental reconstruction for the Late Triassic-Early Jurassic transition. In the Algarve Basin, three new palynozones (AT, SC, and CP) characterise the Silves Group from the early Carnian to early Hettangian, documenting the first Iberian occurrence of Tulesporites briscoensis and precisely delineating the Triassic-Jurassic Boundary (TJB). In the Lusitanian Basin, three palynozones (CG, IK, and Pm) constrain the Conraria and Pereiros formations to the Norian-Hettangian, with the TJB located at the base of the Pereiros Formation. Palaeoenvironmental reconstructions reveal distinct basin-specific evolutions. The Algarve Basin records an early transition from fluvial (Silves Sandstones) to marginal-marine (lagoonal and pond) settings, evidenced by abundant upper Carnian algal elements and reworked Neoproterozoic algae. Conversely, the Lusitanian Basin reflects a Norian-Hettangian marginal-marine, river-dominated setting, with microforaminiferal linings at the base of the Pereiros Formation marking the earliest marine transgression in the Lusitanian Basin. Quantitatively, both basins show a persistent dominance of xerophytic taxa, indicating a shift toward warmer, seasonally dry conditions across the TJB. Malformed sporomorphs in both records suggest environmental stress potentially linked to Central Atlantic Magmatic Province (CAMP) activity. Comparative analysis reveals that sedimentation initiated earlier in the Algarve (early Carnian) than in the Lusitanian Basin (Norian), suggesting diachronous development during Pangaea breakup. The assemblages show strong affinities with the Onslow Microflora, highlighting the Portuguese margin as a key archive for western Tethyan floral and climatic evolution.eng
dc.identifier.citationVilas-Boas, M., Cirilli, S., Pereira, Z., Duarte, L., & Fernandes, P. (2026). The palynology of the Upper Triassic-Lower Jurassic in the Algarve and Lusitanian basins, Portugal. In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2026, vol. 694, article 113824. https://doi.org/10.1016/j.palaeo.2026.113824
dc.identifier.doi10.1016/j.palaeo.2026.113824
dc.identifier.issn0031-0182
dc.identifier.urihttp://hdl.handle.net/10400.9/6383
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationPalynology of the Triassic - Jurassic of the Silves Group in Portugal, its implications on a changing world
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0031018226002877?pes=vor&utm_source=clarivate&getft_integrator=clarivate
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectPalynostratigraphy
dc.subjectPalaeogeography
dc.subjectPalaeoclimate
dc.subjectPalaeoenvironment
dc.subjectTriassic-Jurassic boundary
dc.subjectAlgarve Basin
dc.titleThe palynology of the Upper Triassic-Lower Jurassic in the Algarve and Lusitanian basins, Portugaleng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberSFRH/BD/144125/2019
oaire.awardTitlePalynology of the Triassic - Jurassic of the Silves Group in Portugal, its implications on a changing world
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F144125%2F2019/PT
oaire.citation.titlePalaeogeography, Palaeoclimatology, Palaeoecology
oaire.citation.volume694
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameVilas Boas
person.familyNamePereira
person.familyNameDuarte
person.familyNameFernandes
person.givenNameMargarida
person.givenNameZélia
person.givenNameLuis
person.givenNamePaulo
person.identifier422469
person.identifier.ciencia-id6C1B-ED1C-8F5D
person.identifier.ciencia-id051D-A133-65D9
person.identifier.orcid0000-0001-8501-7052
person.identifier.orcid0000-0003-3056-6219
person.identifier.orcid0000-0002-9025-5896
person.identifier.orcid0000-0003-4888-0230
person.identifier.ridF-5282-2013
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id7005630206
person.identifier.scopus-author-id57197129025
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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