Calcareous nannofossils biostratigraphy and Paleoclimatology of the Bekhme Formation, Bekhere anticline, Dhouk area, Kurdistan region, Northern Iraq
Article Sidebar
Main Article Content
Abstract
A Detailed Calcareous nannofossil study conducted on the Bekhme Formation that is cropped out at the Southern limb of the Bekhere anticline, eastern ward of the Dohuk city near Bajlur village, northern Iraq. The Bekhme Formation is composed of marly limestone, Organic limestone and fossiliferous limestone. The nannopaleontological classification of these calcareous nannofossils led us to determine thirty-four genus/species belonging to nine families. The nannobiostratigraphic analysis suggested three calcareous nannofossils biozones from oldest to youngest are: (1) Quadrum sissinghii Interval Zone; (2) Quadrum trifidum Interval Zone; (3) Tranolithus phacelosus Interval Zone. These biozones suggest that the studied section from the Bekhme Formation is the Middle to Late Campanian, and it refers to temperature fluctuations which considered as possible warm time period at subtropical areas.
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Tikrit Journal of Pure Science is licensed under the Creative Commons Attribution 4.0 International License, which allows users to copy, create extracts, abstracts, and new works from the article, alter and revise the article, and make commercial use of the article (including reuse and/or resale of the article by commercial entities), provided the user gives appropriate credit (with a link to the formal publication through the relevant DOI), provides a link to the license, indicates if changes were made, and the licensor is not represented as endorsing the use made of the work. The authors hold the copyright for their published work on the Tikrit J. Pure Sci. website, while Tikrit J. Pure Sci. is responsible for appreciate citation of their work, which is released under CC-BY-4.0, enabling the unrestricted use, distribution, and reproduction of an article in any medium, provided that the original work is properly cited.
References
[1] Bellen, R.C. van, Dunnington, H.V., Wetzel, R. and Morton, D., (1959). Lexique Stratigraphique International. Asie, Iraq, Fasc. 10a, Paris, 333pp.
[2] Jassim, S.Z. and Buday, T., (2006). Units of the Unstable Shelf and the Zagros Suture. In: Jassim, S. Z. and Goff, J.C. (eds.) Geology of Iraq, Published by Dolin Prague and Moravian Museum, Brno, pp. 71 – 83.
[3] Abdallah, F.T. and Al-Dulaimi,S.I., (2019). Biostratigraphy of the Upper Cretaceous for selected sections in northern Iraq. Iraqi Journal of Science, Vol.60, No. 3, pp: 545-553.
[4] Al-Sulivani, R. F. and Al-Badrani, O.A., (2021). Calcareous Nannofossils Biostratigraphy of Tanjero Formation at Azmer Anticline, Sulimaniya, Northern Iraq. Iraqi Journal of Science, Vol.62, No. 5, pp: 1605-1621.
[5] Al-Haidary, L.Y., (2009). Stratigraphy and Depositional Environment of Bekhme Formation and the Natural of its Contact with Shiranish Formation in Dohuk Area, North of Iraq. Unpublished. M.Sc. Thesis, Mosul University, Iraq.131p. (In Arabic with English abstract).
[6] Al-Mutwali, M. M., Al-Banna, N. Y. and Al-Ghrear, J. S., (2008). Microfacies and Sequence Stratigraphy of the Late Campanian Bekhme Formation in the Dohuk Area, N. Iraq. Journal of GeoArabia, Vol. 13, No.1, pp. 39 - 54.
[7] Armstrong, H. and Brasier, M. (2005). Microfossils Black well publishing, 296p.
[8] Bown, P.R. and Young, J.R., (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, vol. 19, no. 1, pp. 21-36.
[9] Perch-Nielsen, K., (1985). Mesozoic calcareous nannofossils. In: Bolli, H. M., Saunders, J. B. and Perch-Nielsen, K., (eds.), Plankton stratigraphy. Cambridge University Press,
Cambridge, pp. 329-426.
[10] Sissingh, W., (1977). Biostratigraphy of Cretaceous Calcareous Nannoplankton. In Bolli, H.M., Saunders, J.B., and Perch-Nielsen, K. (eds.), 1985. Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 329 – 426.
[11] Bown, P.R., (1998). Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman and Hall, London, pp.132-199.
[12] Ogg, J.G., Ogg, G., and Gradstein, F.M., (2016). A Concise Geologic Time Scale: Amsterdam, Elsevier, 240pp.
[13] Al-Badrani, O.A. and Al-Assaf, E.N., (2011). Nannobiostratigraphy of Shiranish Formation in Balad Well No. 8, Northern Baghdad, Iraq. Iraqi National Journal of Earth Sciences, Vol. 11, No. 2, pp. 65 – 80.
[14] Al-Badrani, O. A. (2012). Nannobiostratiraphy of the Lower part of Shiranish Formation, Sinjar Anticline, NW Iraq. Iraqi National Journal of Earth Sciences, Vol. 12, No. 1, pp. 1-16.
[15] Al-Maamari, A.M. and Al-Badrani, O.A., (2019). Calcareous Nannofossils Biostratigraphy of Shiranish Formation (K-306) well, Northern Iraq. Iraqi National Journal of Earth Sciences Vol.19, No. 2, pp. 1 – 10.