Publicação
Exceptional Pliocene outer-shelf fossil association from the northern border of the Nazaré Canyon (Portugal)
| Resumo: | A block of rock rich in foraminifera and shells of Pecten, collected in the offshore area of Nazaré (Portugal) from the nets of a deep-sea fishing trawler, is studied. The study includes the identification of planktonic and benthic foraminifera, and the specific classification of Operculina and Pecten, which are abundant in the sample. Other objectives of the study were to determine the biostratigraphic and chronostratigraphic age of the rock, as well as to characterize the paleoenvironment based on paleoecological information provided by the different taxonomic groups. The likely age of the rock is the Early Pliocene, corresponding to the planktonic foraminiferal biozone N19 (Blow), between 3.6 and 5.3 Ma. The foraminiferal association indicates warm water temperature and normal salinity. The benthic foraminifera suggest a depth between 50 and 100 meters, being the Planktonic/Benthic ratio compatible with the circalittoral zone. It is also recognized the very abundant occurrence of the macro-foraminifer Operculina complanata and the presence of a species of Pecten determined as Pecten fraterculus. The rock sample from the marine unit could be stratigraphically correlated with the Carnide Formation, mapped on the continent, in the Mondego Basin. |
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| Autores principais: | Shafiq, Waqas |
| Assunto: | Foraminifera Pecten Biostratigraphy Paleoecology Nazaré Canyon |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | A block of rock rich in foraminifera and shells of Pecten, collected in the offshore area of Nazaré (Portugal) from the nets of a deep-sea fishing trawler, is studied. The study includes the identification of planktonic and benthic foraminifera, and the specific classification of Operculina and Pecten, which are abundant in the sample. Other objectives of the study were to determine the biostratigraphic and chronostratigraphic age of the rock, as well as to characterize the paleoenvironment based on paleoecological information provided by the different taxonomic groups. The likely age of the rock is the Early Pliocene, corresponding to the planktonic foraminiferal biozone N19 (Blow), between 3.6 and 5.3 Ma. The foraminiferal association indicates warm water temperature and normal salinity. The benthic foraminifera suggest a depth between 50 and 100 meters, being the Planktonic/Benthic ratio compatible with the circalittoral zone. It is also recognized the very abundant occurrence of the macro-foraminifer Operculina complanata and the presence of a species of Pecten determined as Pecten fraterculus. The rock sample from the marine unit could be stratigraphically correlated with the Carnide Formation, mapped on the continent, in the Mondego Basin. |
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