Investigation of the Boundary between Abderaz and Kalat Formations Based on Calcareous Nannofossils in West Kopet-Dagh (NE IRAN)
- 1 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
- 2
- 3
Abstract
The biostratigraphy of calcareous nannofossils of the Cretaceous is investigated in the boundary between Abderaz and Kalat Formations through the record of species richness, diversity and distribution patterns in the west Kopet-Dagh region. The Kalat Formation comprising of coarse-grained detritus limestone with subordinate sandstone intercalations and the Abderaz Formation mainly consists of limestone, Shale and Limy marl. Nannofossils of this boundary in each of studied sections are listed and figured . 21 species in Ghalehzoo section , 29 species in Sheikh section and 19 species in Jozak section have been determined . Boistratigraphy based on calcareous nannofossil allow the identification of nannofossil standard zones CC21 and CC26 in all of sections, According to these zones in all of sections, the age of the studied thickness is Early Late Campanian - Late Late Maastrichtian in these sections.
- J. Stocklin, “Structural History and Tectonics of Iran: A Review,” AAPG Bulletin, Vol. 52, No. 7, 1968, pp. 1229-1258.
- A. Afshar-Harb, “A Brief History of Geological Exploration and Geology of the Sarakhs Area and the Khangiran Gas Field,” Bulletin of the Iranian Petroleum Institute, Vol. 37, 1969, pp. 86-96.
- J. Stocklin, “Stratigraphic Lexicon of Iran,” Ministry of Industry and Mines, Geological Survey of Iran, Teheran, 1971.
- A. Afshar-Harb, “Geology of Kopet Dagh,” In: A. Hush-Mandzadeh, Ed., Treatise on the Geology of Iran, Geological Survey of Iran, Tehran, 1994. (In Persian)
- P. R. Bown and J. R. Young, “Techniques,” In: P. R. Bown, Ed., Calcareous Nannofossil Biostratigraphy, Chapman & Hall, London, 1998, pp. 16-28. doi:10.1007/978-94-011-4902-0_2
- P. Cepek and W. W. Hay, “Calcareous Nannoplankton and Biostratigraphic Subdivision of the Upper Cretaceous,” Gulf Coast Association of Geological Societies Transactions, Vol. 19, No. 2, 1969, pp. 323-336.
- H. R. Thierstein, “Mesozoic Calcareous Nannoplankton Biostratigraphy of Marine Sediments,” Marine Micropaleontology, Vol. 1, No. 2, 1976, pp. 325-362. doi:10.1016/0377-8398(76)90015-3
- K. Perch-Nielsen, “Recognition of Cretaceous Stage Boundaries by Means of Calcareous Nannofossils,” In: T. Birkelund, R. Bromley, W. K. Christensen, E. Hakansson and F. Surlyk, Eds., Symposium on Cretaceous Stage Boundaries, Copenhagen, 1983, pp. 152-156
- K. Perch-Nielsen, “Mesozoic Calcareous Nannofossils,” In: H. M. Bolli, J. B. Saunders and K. Perch-Nielsen, Eds., Plankton Stratigraphy, Cambridge University Press, Cambridge, 1985, pp. 329-426.
- J. R. Williams and T. J. Bralower, “Nannofossil Assemblages, Fine Fraction Stable Isotopes, and the Paleoceanography of the Valanginian-Barremian (Early Cretaceous) North Sea Basin,” Paleoceanography, Vol. 10, No. 4, 1995, pp. 815-839. doi:10.1029/95PA00977
- S. Gardin, “Late Maastrichtian to Early Danian Calcareous Nannofossilsat Elles (Northwest Tunisia). A Tale of One Million Years across the K-T Boundary,” Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 178, No. 3-4, 2002, pp. 211-231. doi:10.1016/S0031-0182(01)00397-2
- J. A. Burnett, “Upper Cretaceous,” In: P. R. Bown, Ed., Calcareous Nannofossil Biostratigraphy, Chapman and Hall, London, 1998, pp. 132-199.
- J. L. Shamrock and D. K. Watkins, “Evolution of the Cretaceous Calcareous Nannofossil genus Eiffellithus and Its Biostratigraphic Significance,” Cretaceous Research, Vol. 30, No. 5, 2009, pp. 1083-1102. doi:10.1016/j.cretres.2009.03.009