87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal

Detalhes bibliográficos
Autor(a) principal: Ressurreição, R.
Data de Publicação: 2021
Outros Autores: Legoinha, P., Dias, R., Santos, J., Ribeiro, S., Patinha, C., Miranda, R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/34260
Resumo: The Lower Tagus Basin was subjected to several marine transgressions along the Neogene, related to positive eustatic oscillations and also controlled by the regional tectonic activity. In the Alcácer do SalSines region, previous studies identified an episode of marine sedimentation interpreted as having occurred during the late Serravalian to early Tortonian interval, based on biostratigraphic data. This episode is represented in the Alcácer do Sal Formation. The study of the SMS-12-01B borehole, drilled for mineral prospection purposes, located about 10 km NNE of Melides, allowed the identification of a 3 m thick layer of sediments containing marine fossils. 87Sr/86Sr determinations of oyster shells point to deposition about 11.5 Ma ago, validating previous proposals for the age of the formation. These data correspond to the first numerical ages obtained for the Alcácer do Sal Formation, allowing a solid correlation with other known marine units in the Lower Tagus and Algarve basins related to the same transgression episode.
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spelling 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of PortugalLower Tagus Basin, , Alcácer do Sal Formation, 87Sr/86Sr ages.Upper MioceneAlcácer do Sal Formation87Sr/86Sr agesThe Lower Tagus Basin was subjected to several marine transgressions along the Neogene, related to positive eustatic oscillations and also controlled by the regional tectonic activity. In the Alcácer do SalSines region, previous studies identified an episode of marine sedimentation interpreted as having occurred during the late Serravalian to early Tortonian interval, based on biostratigraphic data. This episode is represented in the Alcácer do Sal Formation. The study of the SMS-12-01B borehole, drilled for mineral prospection purposes, located about 10 km NNE of Melides, allowed the identification of a 3 m thick layer of sediments containing marine fossils. 87Sr/86Sr determinations of oyster shells point to deposition about 11.5 Ma ago, validating previous proposals for the age of the formation. These data correspond to the first numerical ages obtained for the Alcácer do Sal Formation, allowing a solid correlation with other known marine units in the Lower Tagus and Algarve basins related to the same transgression episode.Ao longo do Neogénico, a Bacia do Baixo Tejo foi afectada por várias transgressões marinhas, relacionadas com oscilações eustáticas positivas articuladas com a tectónica regional. Na região de Alcácer do SalSines, estudos anteriores identificaram um episódio de sedimentação marinha interpretado como tendo ocorrido durante o Serravaliano final a Tortoniano inicial, com base em dados biostratigráficos. Este episódio está representado pela Formação de Alcácer do Sal. No estudo da sondagem SMS-12-01B, efectuada para prospecção mineral e localizada a cerca de 10 km a NNE de Melides, foi identificado um nível de sedimentos com 3 m de espessura contendo fósseis marinhos. A determinação de razões isotópicas 87Sr/86Sr em conchas de ostras indica idade próxima de 11,5 Ma, validando interpretações anteriores sobre a provável idade da formação. Corresponde à primeira idade numérica obtida para esta unidade sedimentar, permitindo uma correlação sólida com outras unidades conhecidas nas bacias do Baixo Tejo e do Algarve associadas ao mesmo episódio transgressivo.LNEG2021-01-01T00:00:00Z2021-01-01T00:00:00Z2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/34260eng0873-948X10.34637/stdj-wn53Ressurreição, R.Legoinha, P.Dias, R.Santos, J.Ribeiro, S.Patinha, C.Miranda, R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:05:13Zoai:ria.ua.pt:10773/34260Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:05:13.639803Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
title 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
spellingShingle 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
Ressurreição, R.
Lower Tagus Basin, , Alcácer do Sal Formation, 87Sr/86Sr ages.
Upper Miocene
Alcácer do Sal Formation
87Sr/86Sr ages
title_short 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
title_full 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
title_fullStr 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
title_full_unstemmed 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
title_sort 87Sr/86Sr dating of the Alcácer do Sal Formation and its correlation with the upper Miocene of Portugal
author Ressurreição, R.
author_facet Ressurreição, R.
Legoinha, P.
Dias, R.
Santos, J.
Ribeiro, S.
Patinha, C.
Miranda, R.
author_role author
author2 Legoinha, P.
Dias, R.
Santos, J.
Ribeiro, S.
Patinha, C.
Miranda, R.
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Ressurreição, R.
Legoinha, P.
Dias, R.
Santos, J.
Ribeiro, S.
Patinha, C.
Miranda, R.
dc.subject.por.fl_str_mv Lower Tagus Basin, , Alcácer do Sal Formation, 87Sr/86Sr ages.
Upper Miocene
Alcácer do Sal Formation
87Sr/86Sr ages
topic Lower Tagus Basin, , Alcácer do Sal Formation, 87Sr/86Sr ages.
Upper Miocene
Alcácer do Sal Formation
87Sr/86Sr ages
description The Lower Tagus Basin was subjected to several marine transgressions along the Neogene, related to positive eustatic oscillations and also controlled by the regional tectonic activity. In the Alcácer do SalSines region, previous studies identified an episode of marine sedimentation interpreted as having occurred during the late Serravalian to early Tortonian interval, based on biostratigraphic data. This episode is represented in the Alcácer do Sal Formation. The study of the SMS-12-01B borehole, drilled for mineral prospection purposes, located about 10 km NNE of Melides, allowed the identification of a 3 m thick layer of sediments containing marine fossils. 87Sr/86Sr determinations of oyster shells point to deposition about 11.5 Ma ago, validating previous proposals for the age of the formation. These data correspond to the first numerical ages obtained for the Alcácer do Sal Formation, allowing a solid correlation with other known marine units in the Lower Tagus and Algarve basins related to the same transgression episode.
publishDate 2021
dc.date.none.fl_str_mv 2021-01-01T00:00:00Z
2021-01-01T00:00:00Z
2021
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/34260
url http://hdl.handle.net/10773/34260
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0873-948X
10.34637/stdj-wn53
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv LNEG
publisher.none.fl_str_mv LNEG
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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