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The age of the first pulse of continental rifting associated with the breakup of Pangea in Southwest Iberia: new palynological evidence

2022-03Journal article Open access
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dc.contributor.authorVilas Boas, Margarida
dc.contributor.authorPaterson, Niall W.
dc.contributor.authorPereira, Zélia
dc.contributor.authorFernandes, Paulo
dc.contributor.authorCirilli, Simonetta
dc.date.accessioned2022-04-11T14:45:01Z
dc.date.available2022-04-11T14:45:01Z
dc.date.issued2022-03
dc.description.abstractABSTRACT: In this work, we report the first palynological age for the base strata of the Silves Sandstones of the Silves Group in the Algarve Basin, located in Southern Portugal. The group is the oldest sedimentary unit of the Algarve Basin and was deposited unconformably over late Pennsylvanian turbidites of the Mira Formation, which were folded and faulted during the Variscan Orogeny. The Silves Group comprises a detrital red bed succession, representing the earliest phase of sedimentation associated with the initial rifting of Pangaea. Macrofossils are rare, occurring predominantly in the top layers of this group, and do not accurately constrain the age of the entire group's deposition. From an outcrop exposed in the central Algarve, a grey mudstone bed positioned 2.5 m above the Variscan unconformity plane yielded palynomorphs that date the beginning of sedimentation in this basin to the early Carnian age (Late Triassic). The moderately well preserved and low-diversity palynological association comprises Aulisporites astigmosus, Enzonalasporites densus, Ovalipollis pseudoalatus, Samaropollenites speciosus, Tulesporites briscoensis and Vallasporites ignacii, among others, and is indicative of an early Carnian age.pt_PT
dc.description.abstractRESUMEN: Mediante datos de asociaciones palinológicas, describimos por primera vez la edad de los niveles de la base de la Formación Areniscas de Silves, del Grupo Silves, en la cuenca del Algarve, sur de Portugal. Este grupo representa la unidad sedimen taria más antigua del Mesozoico de la Cuenca del Algarve, y fue depositada discordantemente sobre las areniscas de edad Pensilvaniense superior de la Formación Mira, un registro sedimentario que fue plegado y fallado durante la Orogenia Varisca. El Grupo Silves muestra unos sedimentos detríticos rojos que representan la fase más temprana de la sedimentación y que está asociada a las primeras fases de la ruptura de Pangea. Los macrofósiles son escasos, se encuentran en los niveles superiores del grupo y no proporcionan una edad determinada. Una asociación palinológica ha sido encontrada y descrita en un nivel de lutitas grises situado a 2,5 cm por encima de la discordancia varisca, y que proporcionan una edad Carniense (Triásico Superior) para el comienzo de la sedimentación de esta unidad. Se trata de una asociación moderadamente bien conservada y con baja diversidad de elementos, que contiene Aulisporites astigmosus, Enzonalasporites densus, Ovalipollis pseudoalatus, Samaropollenites speciosus, Tulesporites briscoensis y Vallaspollites ignacii entre otros, y es indicativa de un Carniense inferior.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationVilas-Boas, Margarida... [et.al.] - The age of the first pulse of continental rifting associated with the breakup of Pangea in Southwest Iberia: new palynological evidence. In: Journal of Iberian Geology, 2022, vol.48, p. 181–190pt_PT
dc.identifier.doi10.1007/s41513-022-00189-0pt_PT
dc.identifier.eissn1886-7995
dc.identifier.issn1698-6180
dc.identifier.urihttp://hdl.handle.net/10400.9/3821
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationPalynology of the Triassic - Jurassic of the Silves Group in Portugal, its implications on a changing world
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.relation.publisherversionhttps://doi.org/10.1007/s41513-022-00189-0pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPalynologypt_PT
dc.subjectPalynostratigraphypt_PT
dc.subjectUpper Triassicpt_PT
dc.subjectVariscan orogenypt_PT
dc.subjectAlgarve Basinpt_PT
dc.subjectPortugalpt_PT
dc.titleThe age of the first pulse of continental rifting associated with the breakup of Pangea in Southwest Iberia: new palynological evidencept_PT
dc.title.alternativeLa edad del primer pulso de rifting continental asociado a la ruptura de Pangea en el suroeste ibérico: nueva evidencia palinológicapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitlePalynology of the Triassic - Jurassic of the Silves Group in Portugal, its implications on a changing world
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F144125%2F2019/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00350%2F2020/PT
oaire.citation.titleJournal of Iberian Geologypt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameVilas Boas
person.familyNamePereira
person.familyNameFernandes
person.givenNameMargarida
person.givenNameZélia
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.orcid0000-0003-4888-0230
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id57197129025
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
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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