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New 87Sr/86Sr constraints on the marine Miocene of the Lower Tagus Basin and the Alentejo Coastal Plain (Portugal) [Resumo]

2026-06Documento de conferência Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
dc.contributor.authorRessurreição, Ricardo
dc.contributor.authorLegoinha, Paulo
dc.contributor.authorDias, Ruben
dc.contributor.authorHorta Pacheco dos Santos, José Francisco
dc.contributor.authorMonteiro Ribeiro, Sara
dc.contributor.authorPatinha, Carla
dc.date.accessioned2026-09-21T15:05:18Z
dc.date.available2026-09-21T15:05:18Z
dc.date.issued2026-06
dc.description.abstractABSTRACT: Sedimentation in the Lower Tagus Basin was strongly controlled by eustatic oscillations, with several marine incursions during the Miocene. Previous studies, based on biostratigraphic and isotopic data, identified ten depositional sequences in the southwestern sector of the basin that correlate with thirdorder eustatic cycles. Some of these transgressions reached considerable amplitudes, with marine influence extending up to ~80 km inland under the present-day configuration of the territory. Preliminary results of 87Sr/86Sr isotopic dating from oyster shells collected in the Lower Tagus Basin (LTB) and the Alentejo Coastal Plain (ACP) are presented (figure 1). At Vila Nova da Rainha, a 15.69 Ma age (correlating with Langhian, V-b unit at Lisbon) anchors the marine-influenced base of the local succession, exposing a ~5 Ma hiatus between these levels and the overlying sands with Hipparion (Vallesian, MN 9). This age corroborates previous bio-chronostratigraphic assignments. Marine and marginal-marine sediments crop out along the eastern margin of the LTB and in the ACP. In the Alcácer do Sal region and along the Melides–Sines coast, these deposits are assigned to the Alcácer do Sal Formation (upper Serravallian–lower Tortonian). However, further north, as far as Lavre (Montemor-o-Novo), geological mapping attributes them to a broader interval corresponding to the Vindobonian (Langhian–Tortonian). Oyster shells collected at two sites along the Marateca stream (Monte da Moinhola and Monte Novo) and at Melides yielded ages of 11.13 Ma, 11.03–7.32 Ma and 8.58 Ma. These values indicate Tortonian deposition and are consistent with the Alcácer do Sal Formation, suggesting that marine Miocene deposits cropping out as far north as Lavre may belong to this unit, representing one of the most landward-penetrating Miocene transgressions. At the base of the sea cliff at Galé beach (Melides), calcareous sandstones and sands with marine fauna have been mapped as part of the Alcácer do Sal Formation. However, 87Sr/86Sr dating of oyster shells yielded ages between 6.79 and 5.80 Ma, indicating Messinian deposition. These sediments can therefore be correlated with the Esbarrondadoiro Formation, a Messinian marine unit of the Alvalade Basin whose connection with the coastal area had not previously been unequivocally identified. This study contributes to the understanding of the marine Miocene of southwestern Portugal and has implications for paleogeographic reconstruction and geological mapping.eng
dc.identifier.citationRessurreição, R., Legoinha, P., Dias, R., Santos, J. F., Ribeiro, S., & Patinha, C. (2026). New 87Sr/86Sr constraints on the marine Miocene of the Lower Tagus Basin and the Alentejo Coastal Plain (Portugal). In: Livro de resumos, XII Congresso Nacional de Geologia, Évora, Portugal, 21-26 junho, 2026, pp. 195-196
dc.identifier.isbn978-972-778-551-3
dc.identifier.urihttp://hdl.handle.net/10400.9/6475
dc.language.isoeng
dc.peerreviewedno
dc.publisherUniversidade de Évora
dc.relationGeoBioSciences GeoTechnologies and GeoEngineering
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleNew 87Sr/86Sr constraints on the marine Miocene of the Lower Tagus Basin and the Alentejo Coastal Plain (Portugal) [Resumo]eng
dc.typeconference object
dspace.entity.typePublication
oaire.awardNumberUIDB/04035/2020
oaire.awardTitleGeoBioSciences GeoTechnologies and GeoEngineering
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04035%2F2020/PT
oaire.citation.conferenceDate2026-06-21
oaire.citation.conferencePlaceÉvora, Portugal
oaire.citation.endPage196
oaire.citation.startPage195
oaire.citation.titleXII Congresso Nacional de Geologia
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
person.familyNameRessurreição
person.familyNameLegoinha
person.familyNameDias
person.familyNameHorta Pacheco dos Santos
person.familyNameMonteiro Ribeiro
person.familyNamePatinha
person.givenNameRicardo
person.givenNamePaulo
person.givenNameRuben
person.givenNameJosé Francisco
person.givenNameSara
person.givenNameCarla
person.identifierC-8843-2012
person.identifierM-7553-2017
person.identifier.ciencia-id8C11-1508-A8A2
person.identifier.ciencia-id281A-8919-2033
person.identifier.ciencia-id0F10-032A-E243
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person.identifier.ciencia-idD411-D177-2616
person.identifier.orcid0000-0003-3201-3650
person.identifier.orcid0000-0002-7592-7949
person.identifier.orcid0000-0003-1654-809X
person.identifier.orcid0000-0003-4997-8264
person.identifier.orcid0000-0002-5074-5452
person.identifier.orcid0000-0001-6006-344X
person.identifier.scopus-author-id37045333900
person.identifier.scopus-author-id8759602200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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