Constraining the age of the last marine sediments in the late Cretaceous of central south Pyrenees (NE Spain): Insights from larger benthic foraminifera and strontium isotope stratigraphy |
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| Institution: | 1. Departament de Geologia (Paleontologia), Universitat Autònoma de Barcelona, Campus Bellaterra, 08193 Barcelona, Spain;2. Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Germany;3. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università degli Studi di Napoli Federico II, Napoli, Italy;4. Departament d''Estratigrafia, Paleontologia i Geociències Marines, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain;1. Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, C/ Escola Industrial 23, E-08201, Sabadell, Catalonia, Spain;2. Departament de Geologia (Estratigrafia), Facultat de Ciències, Universitat Autònoma de Barcelona, Carrer de l''Eix central, E-08193, Cerdanyola del Vallès, Barcelona, Catalonia, Spain;3. Departament d''Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona-UB, c/Martí i Franquès s/n, E-08028, Barcelona, Catalonia, Spain;1. Arabako Natur Zientzien Museoa/Museo de Ciencias Naturales de Álava, Siervas de Jesús 24, E–01001 Vitoria–Gasteiz, Spain;2. Universidad del País Vasco/Euskal Herriko Unibertsitatea, Facultad de Ciencia y Tecnología, Departamento de Estratigrafía y Paleontología, Apartado 644, 48080 Bilbao, Spain;3. ISEM, CNRS UMR 5554, Université de Montpellier, Place Eugène Bataillon, F–34095 Montpellier Cedex 5, France;1. Department of Mathematics and Geosciences. University of Trieste, Italy;2. Department of Geological Engineering, Faculty of Engineering and Graduate School of Natural and Applied Sciences, Ankara University, Ankara, Turkey;1. Departament d''Estratigrafia, Paleontologia i Geociències marines, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain;2. Departamento de Ciencias de la Tierra (Paleontología), Instituto Universitario de Investigación en Ciencias Ambientales de Aragón, Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009 Zaragoza, Spain;3. Departament de Geologia (Estratigrafia), Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona E-08193, Catalonia, Spain;1. Shandong Institute of Geological Sciences, Jinan 250013, China;2. Key Laboratory of Gold Mineralization Processes and Resource Utilization Subordinated to the Ministry of Land and Resources, Jinan 250013, China;3. Key Laboratory of Metallogenic Geological Process and Resources Utilization in Shandong Province, Jinan 250013, China;4. Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China;5. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;6. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The uppermost Cretaceous (upper Campanian–Maastrichtian) marine deposits of the central south Pyrenees host a rich larger benthic foraminiferal fauna and several rudist-rich levels. These marine deposits are directly overlain by the continental facies of the Arén and Tremp Formations, which are famous for their fossil dinosaur remains. Larger benthic foraminiferal distribution documents an important faunal turnover in all the carbonate platform environments within the photic zone, from open marine to littoral areas. Biostratigraphy indicates that this turnover occurred close to the Campanian-Maastrichtian boundary. This is also confirmed by strontium isotope stratigraphy which indicates an earliest Maastrichtian age for the appearance of the larger benthic foraminiferal assemblage constituted by Lepidorbitoides socialis, Clypeorbis mammillata, Wannierina cataluniensis, Orbitoides gruenbachensis, Siderolites aff. calcitrapoides, Fascispira colomi, Omphalocyclus macroporus and Laffiteina mengaudi. In particular, a numerical age of 71 Ma is obtained for the Hippurites radiosus level, just a few meters below the first continental deposits of the Arén sensu stricto Formation. The youngest marine sediments of the central south Pyrenees are early Maastrichtian in age. This is also an important constraint for the age of the end-Cretaceous dinosaur fossil localities of the Tremp basin. |
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| Keywords: | Larger benthic foraminifera Strontium isotope stratigraphy Late Cretaceous Campanian-Maastrichtian boundary Tremp basin Pyrenees NE Spain |
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