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

• Autor(a) principal: Ressurreição, Ricardo
• Data de Publicação: 2021
• Outros Autores: Legoinha, Paulo, Dias, Rúben Pereira, Santos, José Francisco, Ribeiro, Sara Monteiro, Patinha, Carla, Miranda, R.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/127470
• topic: 87Sr/86Sr ages; Alcácer do Sal Formation; Lower Tagus Basin; Upper Miocene; Renewable Energy, Sustainability and the Environment; Environmental Science (miscellaneous); Earth and Planetary Sciences(all); SDG 7 - Affordable and Clean Energy; SDG 14 - Life Below Water

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.