Repository logo
 
Publication

The palynological response to the Toarcian Oceanic Anoxic Event (Early Jurassic) at Peniche, Lusitanian Basin, western Portugal

2017-12Journal article Restricted access
Simple item page
dc.contributor.authorCorreia, Mariana F.
dc.contributor.authorRiding, James B.
dc.contributor.authorDuarte, Luis V.
dc.contributor.authorFernandes, Paulo
dc.contributor.authorPereira, Zelia
dc.date.accessioned2019-11-20T15:07:09Z
dc.date.available2019-11-20T15:07:09Z
dc.date.issued2017-12
dc.description.abstractThe uppermost Pliensbachian and lower Toarcian (Lower Jurassic) succession exposed at Peniche in the central part of the Lusitanian Basin, western Portugal, was examined for palynomorphs. The 45 samples span the Emaciaticeras emaciatum, Dactylioceras polyrnorphum and Hildaites levisoni ammonite biozones (ABs), and the succession includes the Global boundary Stratotype Section and Point (GSSP) for the Toarcian Stage and the Toarcian Oceanic Anoxic Event (T-OAE). A low diversity dinoflagellate cyst flora, typical of the Sub-Boreal Realm, was recovered from the Emaciaticeras emaciatum and Dactylioceras polymotphum ABs. The dominant element is the cold water species Luehndea spinosa, which is an index for the Pliensbachian to earliest Toarcian, and is thought to have migrated from the more northerly Boreal Realm. Prior to the T-OAE, dinoflagellates thrived in the Lusitanian Basin, except during a brief warm period in the earliest Toarcian. Despite the latter, the recovery from this event was relatively rapid and was characterised by a return to relatively cool temperatures. The Hildaites levisoni AB at Peniche represents the T-OAE and the overlying strata, and is characterised by a profound reduction in dinoflagellate cyst relative abundances. This dinoflagellate cyst 'blackout', and the associated rise of prasinophytes, reflects significant environmental stress, such as marine anoxia, elevated temperatures and reduced salinity, with the former two probably being most important. The low proportions of dinoflagellate cysts following the T-OAE indicates a protracted recovery phase from the bottom and water column anoxia developed throughout the Lusitanian Basin.
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) [SFRH/BD/93950/2013]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.marmicro.2017.10.004
dc.identifier.issn0377-8398
dc.identifier.issn1872-6186
dc.identifier.urihttp://hdl.handle.net/10400.1/12908
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectPliensbachian-early toarcian
dc.subjectCarbon-isotope excursion
dc.subjectMiddle toarcian
dc.subjectCalcareous nannofossils
dc.subjectEnvironmental-changes
dc.subjectCyst paleoecology
dc.subjectSouthwest Germany
dc.subjectSection Portugal
dc.subjectCoimbra region
dc.subjectNeuquen basin
dc.titleThe palynological response to the Toarcian Oceanic Anoxic Event (Early Jurassic) at Peniche, Lusitanian Basin, western Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.endPage63
oaire.citation.startPage46
oaire.citation.titleMarine Micropaleontology
oaire.citation.volume137
oaire.fundingStream5876
person.familyNameCorreia
person.familyNameFernandes
person.givenNameMariana
person.givenNamePaulo
person.identifier422469
person.identifier.ciencia-id051D-A133-65D9
person.identifier.orcid0000-0001-8451-3468
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
relation.isAuthorOfPublication0d07499b-2be8-42ee-a1b6-dbcdf042f59c
relation.isAuthorOfPublicationa2d98df3-a9c2-4364-a737-25b4e89df80b
relation.isAuthorOfPublication.latestForDiscovery0d07499b-2be8-42ee-a1b6-dbcdf042f59c
relation.isProjectOfPublicationb84cb732-8d6b-43ff-974b-01c29a129290
relation.isProjectOfPublication.latestForDiscoveryb84cb732-8d6b-43ff-974b-01c29a129290

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
12908.pdf
Size:
2.33 MB
Format:
Adobe Portable Document Format
Download

Collections

CIM2-Artigos (em revistas ou actas indexadas)