Datação87sr/86sr da formação de alcácer do sal (Miocénico superior, portugal continental)

Ricardo Ressurreição; Paulo Legoinha; Rúben Pereira Dias; José Francisco Santos; Sara Monteiro  Ribeiro; Carla Patinha; R. Miranda

doi:10.34637/stdj-wn53

Datação87sr/86sr da formação de alcácer do sal (Miocénico superior, portugal continental)

Translated title of the contribution: 87sr/86sr dating of the alcácer do sal formation (Upper miocene, mainland portugal)

Ricardo Ressurreição, Paulo Legoinha, Rúben Pereira Dias, José Francisco Santos, Sara Monteiro Ribeiro, Carla Patinha, R. Miranda

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Abstract

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 Sal-Sines 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.

Translated title of the contribution	87sr/86sr dating of the alcácer do sal formation (Upper miocene, mainland portugal)
Original language	Portuguese
Pages (from-to)	5-11
Number of pages	7
Journal	Comunicações Geológicas
Volume	108
Issue number	1
DOIs	https://doi.org/10.34637/stdj-wn53
Publication status	Published - 2021

Keywords

87Sr/86Sr ages
Alcácer do Sal Formation
Lower Tagus Basin
Upper Miocene

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10.34637/stdj-wn53

87Sr86Sr-dating-of-the-Alcácer-do-Sal-Formation-2020Final published version, 712 KB

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abstract = "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 Alc{\'a}cer do Sal-Sines 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 Alc{\'a}cer 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 Alc{\'a}cer 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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AU - Ressurreição, Ricardo

AU - Legoinha, Paulo

AU - Dias, Rúben Pereira

AU - Santos, José Francisco

AU - Ribeiro, Sara Monteiro

AU - Patinha, Carla

AU - Miranda, R.

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N2 - 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 Sal-Sines 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.

AB - 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 Sal-Sines 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.

KW - 87Sr/86Sr ages

KW - Alcácer do Sal Formation

KW - Lower Tagus Basin

KW - Upper Miocene

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Datação87sr/86sr da formação de alcácer do sal (Miocénico superior, portugal continental)

Abstract

Keywords

UN SDGs

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