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Environmental conditions in the pre-Jenkyns event time (late Pliensbachian - early Toarcian) in the South Iberian Palaeomargin (Betic External Zones, Southern Spain)

dc.contributor.authorNieto-Albert, Luis Miguel
dc.contributor.authorAyadi, Chaima
dc.contributor.authorFraguas, Ángela
dc.contributor.authorMolina-Cámara, José Miguel
dc.contributor.authorReolid, Matías
dc.date.accessioned2024-10-22T07:15:55Z
dc.date.available2024-10-22T07:15:55Z
dc.date.issued2024-10-18
dc.description.abstractThree stratigraphic sections of the Betic External Zones were studied, two from the Median Subbetic (PEL and PR) and one from the External Subbetic (CE). The upper Pliensbachian materials and the transition to the lower Toarcian were dated with calcareous nannofossils in PEL and PR in this paper, while in the CE section, previous ammonite and nannofossil biostratigraphies were considered. The dominant facies are alternance of marly limestone—marl, although in the CE section, the Toarcian is represented by marls, where the Jenkyns Event has been recorded. In terms of ichnofossils, in the PEL section Macaronichnus predominates. In the PR and CE sections, the ichnoassemblages are dominated by Planolites, Thalassinoides and Chondrites. The facies and ichnofacies distinguished formed in pelagic or hemipelagic marine environments. Analysis of the correlation between δ13C and δ18O and of each of them with Sr and Fe/Ca and Sr/Ca, as well as the Z-factor, indicate that the geochemical signal has not been modified by diagenesis. In the PEL and PR sections, the δ13C and δ18O ratios do not allow to clearly identify isotopic events, except in CE where the Jenkyns Event was recorded. The proxies used to study detritism (Zr/Rb, Sr/Cu, Chemical Index Alteration, CIA, and C-value) show trends opposite to those detected in other Tethys sections and even between them. These peculiarities in the geochemical data are interpreted as the result of the opening of the Hispanic Corridor, the mixing of Panthalassa and Tethys seawaters and extensional tectonics, which favoured the development of half grabens with significant differential subsidence, especially during the NJT5b Subzone (latest Pliensbachian). These half grabens could be affected by contourite currents according to the Macaronichnus assemblage in some of these sections.es_ES
dc.identifier.citationNieto et al. 2024. Journal of Iberian Geologyes_ES
dc.identifier.issn1698-6180es_ES
dc.identifier.otherhttps://doi.org/10.1007/s41513-024-00254-wes_ES
dc.identifier.urihttps://hdl.handle.net/10953/3297
dc.language.isoenges_ES
dc.publisherSpringeres_ES
dc.relation.ispartofJournal of Iberian Geologyes_ES
dc.rightsCC0 1.0 Universal*
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectEarly Jurassices_ES
dc.subjectSouthern Iberian Palaeomargines_ES
dc.subjectIchnofossilses_ES
dc.subjectCalcareous nannofossil biostratigraphes_ES
dc.subjectGeochemical proxies of detritismes_ES
dc.subjectHispanic Corridores_ES
dc.subjectContourite currentses_ES
dc.titleEnvironmental conditions in the pre-Jenkyns event time (late Pliensbachian - early Toarcian) in the South Iberian Palaeomargin (Betic External Zones, Southern Spain)es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/acceptedVersiones_ES

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