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The palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal

2017-02Journal article Restricted access
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dc.contributor.authorCorreia, Vania F.
dc.contributor.authorRiding, James B.
dc.contributor.authorFernandes, Paulo
dc.contributor.authorDuarte, Luis V.
dc.contributor.authorPereira, Zelia
dc.date.accessioned2019-11-20T15:07:51Z
dc.date.available2019-11-20T15:07:51Z
dc.date.issued2017-02
dc.description.abstractThe lower and middle Toarcian (Lower Jurassic) successions of the northern Lusitanian Basin in western Portugal were examined for palynomorphs. Two localities, the Maria Pares and the Vale das Fontes sections, were sam-pled. The sections span the Dactylioceras polymorphum, Hildaites leyisoni and Hildoceras bifrons ammonite biozones. The samples produced relatively low diversity dinoflagellate cyst floras which are typical of those from coeval European successions; the most abundant species is Luehndea spinosa. The other forms encountered were Mancodinium semitabulatum, Mendicodinium microscabratum, M. spinosum subsp. spinosum, Mendicodinium sp., Nannoceratopsis ambonis, N. gracilis and N. senex. Dinoflagellate cysts typically dominate throughout the Dactylioceras polymorphum ammonite biozone; their abundance significantly decreased in the overlying Hildaites levisoni and Hildoceras bifrons ammonite biozones. The low diversity Luehndea-Nannoceratopsis dinoflagellate cyst flora of the northern Lusitanian Basin is characteristic of the Sub-Boreal region of Europe. This is a transitional region, intercalated between the Boreal and Tethyan realms. The Toarcian Oceanic Anoxic Event (T-OAE) in the northern Lusitanian Basin is characterised by a sudden decline in palynomorph abundance and diversity, including the virtual absence of acritarchs and dinoflagellate cysts. Following the T-OAE, Mancodinium semitabulatum and Mendicodinium spp. were the only dinoflagellate cysts recorded. This 'blackout' of dinoflagellate cysts during the T-OAE, and their partial recovery following the event, shows that dinoflagellate populations were responding to a major palaeoenvironmental change. (C) 2016 Elsevier B.V. All rights reserved.
dc.description.sponsorshipPortuguese Foundation for Science and Technology [SFRH/BD/93950/2013]
dc.description.sponsorshipFundacao para a Ciencia e Tecnologia (FCT), through the strategic project [UID/MAR/04292/2013]
dc.identifier.doi10.1016/j.revpalbo.2016.11.008
dc.identifier.issn0034-6667
dc.identifier.issn1879-0615
dc.identifier.urihttp://hdl.handle.net/10400.1/13250
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.subjectOceanic anoxic event
dc.subjectRegressive facies cycles
dc.subjectOrganic-matter
dc.subjectRecord
dc.subjectFrance
dc.subjectPhytoplankton
dc.subjectSuccession
dc.subjectNormandy
dc.subjectBuildups
dc.subjectEngland
dc.titleThe palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.endPage95
oaire.citation.startPage75
oaire.citation.titleReview of Palaeobotany and Palynology
oaire.citation.volume237
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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