Calcareous nannofossil biostratigraphy of Campanian strata (Abtalkh Formation) from the eastern Koppeh-Dagh Basin,NE Iran |
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| Institution: | 1. Exploration Directorate, National Iranian Oil Company, Seoul St., NE Sheikh Bahaei Sq., 1994814695, Tehran, Iran;2. Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, UMR CNRS 7072, Université Pierre et Marie Curie Paris 06, 4, Place Jussieu, 75252 Paris cedex 05, France;3. Geology Department, Earth Sciences Faculty, Shahid Beheshti University, 1983963113, Daneshjoo Blvd., Evin, Tehran, Iran;4. Faculty of Sciences, Ferdowsi University of Mashhad, 9177948974, Azadi sq., Mashhad, Iran;1. Paläontologisches Institut und Museum, Universität Zürich, Karl Schmid-Strasse 4, CH-8006 Zürich, Switzerland;2. Naturmuseum St. Gallen, Rorschacherstrasse 263, CH-9016 St. Gallen, Switzerland;3. Institute of Earth Sciences, Bâtiment Géopolis, CH-1015 Lausanne, Switzerland;4. Fachbereich Geowissenschaften, Universität Bremen, Klagenfurter Strasse, 28359 Bremen, Germany;5. Schneeglöggliweg 37, CH-8048 Zürich, Switzerland;1. University of Manchester, School of Earth and Environmental Sciences, North Africa Research Group, M13 9PL Manchester, UK;2. Aix Marseille Université, CNRS, IRD, Coll France, CEREGE, Aix-en-Provence, Site Saint-Charles – Case 67 – 3, Place Victor Hugo, 13331 Marseille Cedex 3, France;3. Groupement d''Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France;4. Université Ibn Zohr, Faculté des Sciences, Département de Géologie, Laboratoire de Géologie Appliquée et Géo-Environnement (LAGAGE), B.P 8106 Cité Dakhla, Agadir, Morocco;1. Geology Department, Faculty of Science, Zagazig University, Zagazig, Egypt;2. Botany Department, Faculty of Science, Zagazig University, Zagazig, Egypt;1. UMR CNRS 6118 Géosciences, Université Rennes 1, avenue du Général Leclerc, 35042 Rennes cedex, France;2. School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK;3. Department of Geography and Earth Sciences, Aberystwyth University, Penglais, Aberystwyth SY23 3DB, Wales, UK;4. UMR 7207 CR2P CNRS/MNHN/UPMC, Département Histoire de la Terre, Muséum National d''Histoire Naturelle, Paris, France;5. UMR CNRS 5554, Institut des Sciences de l''Evolution, Université Montpellier, Montpellier, France;6. Muséum National d''Histoire Naturelle, Département Histoire de la Terre, Paris, France;1. Faculty of Geography and Biology, Pedagogical University of Cracow, Podchorążych St. 2a, Kraków 30-084, Poland;2. Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Aleje Mickiewicza 30, Kraków 30-059, Poland;1. Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, 69120, Heidelberg, Germany;2. Departamento de Biologia, Universidade Federal de Sergipe, Avenida Marechal Rondon, Rosa Elze, São Cristovão-SE, Brazil;3. Área de Ciências Exatas e Tecnologias, Universidade Tiradentes, Avenida Murilo Dantas, Farolândia, 300, Aracaju-SE, Brazil |
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| Abstract: | The Campanian of the eastern Koppeh-Dagh Basin (NE Iran) is generally considered to be represented by the upper part of the Abderaz and the Abtalkh formations. The Abtalkh Formation, which is studied here, reaches thicknesses of up to 1750 m in the area. The formation is characterized by abundant, diverse, and poor to moderately well preserved calcareous nannofossil assemblages of Tethyan affinity. The assemblages were studied in detail in two sections in eastern Koppeh-Dagh, allowing construction of a precise biozonation for this stage. The Abtalkh Formation at sections in Abtalkh village and Padeha spans biozones CC20 to CC23a (UC15bTP to UC16). The results of this study indicate a late early to late Campanian age for the formation in the area. The most complete Campanian sequence is in the southeast, where the Padeha section is located. Nannofossil abundance and diversity decreases upwards, showing a trend from the base to top of the formation. Dominance of warm water taxa, and low abundance of high latitude taxa, confirm placement of the basin in low to mid palaeolatitudes during deposition of the formation. |
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| Keywords: | Abtalkh Formation Biostratigraphy Calcareous nannofossils Campanian Koppeh-Dagh Basin |
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