OJG  Vol.3 No.3 , July 2013
Investigation of the Boundary between Abderaz and Kalat Formations Based on Calcareous Nannofossils in West Kopet-Dagh (NE IRAN)

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.

Cite this paper
M. Moheghy, F. Hadavi and B. Rahimi, "Investigation of the Boundary between Abderaz and Kalat Formations Based on Calcareous Nannofossils in West Kopet-Dagh (NE IRAN)," Open Journal of Geology, Vol. 3 No. 3, 2013, pp. 178-186. doi: 10.4236/ojg.2013.33021.
[1]   J. Stocklin, “Structural History and Tectonics of Iran: A Review,” AAPG Bulletin, Vol. 52, No. 7, 1968, pp. 1229-1258.

[2]   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.

[3]   J. Stocklin, “Stratigraphic Lexicon of Iran,” Ministry of Industry and Mines, Geological Survey of Iran, Teheran, 1971.

[4]   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)

[5]   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

[6]   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.

[7]   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

[8]   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

[9]   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.

[10]   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

[11]   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

[12]   J. A. Burnett, “Upper Cretaceous,” In: P. R. Bown, Ed., Calcareous Nannofossil Biostratigraphy, Chapman and Hall, London, 1998, pp. 132-199.

[13]   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

[14]   N. Thibault and S. Gardin, “Maastrichtian Calcareous Nannofossil Biostratigraphy and Paleoecology in the Equatorial Atlantic (Demerara Rise, ODP Leg 207 Hole 1258A),” Revue de Micropaléontologie, Vol. 49, No. 4, 2006, pp. 199-214. doi:10.1016/j.revmic.2006.08.002

[15]   A. Afshar-Harb, “The Stratigraphy, Tectonics and Petroleum Geology of the Kopet Dagh Region, Northern Iran,” Ph.D. Thesis, University of London, London, 1979.

[16]   F. Hadavi and M. A. Moheghy, “Biostratigraphic Study of the Calcareous Nannoplanktons of Kalat City and Chahchaha Village,” Geosciences, Vol. 12, No. 55, 2005, pp. 42-53. (Text in Persian, Abstract in English)

[17]   F. Hadavi and M. N. Moghaddam, “Calcareous Nannofossils from Chalky Limestone of Upper Abderaz Formation and Lower Part of Abtalkh Formationin the Kopet-Dogh Rang NE Iran,” Arabian Journal of Geoscience, Vol. 3, No. 7-8, 2010, pp. 52-61. doi:10.1007/s12517-009-0106-5

[18]   F. Hadavi and M. N. Moghaddam, “Nannostratigraphy, Nannofossil Events, and Paleoclimate Fluctuations in the Lower Boundary of Kalat Formation in East Kopet Dagh (NE Iran),” Arabian Journal of Geoscience, Vol. 5, No. 6, 2012, pp. 50-65. doi:10.1007/s12517-012-0802-4

[19]   M. A. Moheghy and F. Hadavi, “Nanostratigraphy and Sedimentology of the Abderaz Formation at Sheikh Section (Western Kopet-Dagh Basin),” Journal of Applied Geology, Vol. 8. No. 2, 2012, pp. 59-172. (Text in Persian, Abstract in English)

[20]   H. R. Thierstein, “Selective Dissolution of Late Cretaceous and Earliest Tertiary Calcareous Nannofossils: Experimental Evidence,” Cretaceous Research, Vol. 1, No. 2, 1980, pp. 165-176. doi:10.1016/0195-6671(80)90023-3

[21]   W. Sissingh, “Biostratigraphy of Cretaceous Calcareous Nannoplankton,” Geologie en Minjbouw, Vol. 56, No. 1, 1977, pp. 37-65.