Microfacies analysis, planktonic foraminifera, and calcareous nannofossil biostratigraphy in the Campanian sequences, Kurdistan region, NE Iraq

被引：2
作者：
Al-Hazaa S.H. [1 ]
Jaff R.B.N. [2 ]
Lawa F.A.A. [3 ]
Mahanipour A. [4 ]
Al-Kahtany K. [5 ]
机构：
[1] Department of Applied Geology, College of Science, University of Tikrit, Tikrit
[2] Department of General Sciences, College of Education and Languages, Charmo University, Chamchamal, Kurdistan region
[3] Department of Geology, University of Sulaimani, Sulaymaniyah, Kurdistan region
[4] Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman
[5] Seismic Studies Center, Geology and Geophysics Department, College of Science, King Saud University, Riyadh
来源：
Arabian Journal of Geosciences | 2021年 / 14卷 / 2期
关键词：
Calcareous nannofossil; Campanian; Iraq; Kurdistan region; Microfacies; Planktonic foraminifera;
D O I：
10.1007/s12517-020-06369-5
中图分类号：
学科分类号：
摘要：
Campanian planktonic foraminifera and calcareous nannofossil biostratigraphy in the Degala segment positioned in the Bina Bawi anticline in the Kurdistan region, NE Iraq, have been described in detail. The study is concentrated on the Kometan and Shiranish formational boundary which has not been defined formerly. The top of the Kometan Formation is pronounced by sharp variations in lithology from the replication of well-bedded hemipelagic limestone to glauconitic chalky limestone, blue-colored marlstone, and argillaceous limestone of the superimposing Shiranish Formation. The Tethyan standardization of biostratigraphy based on calcareous nannofossil and planktonic foraminifera can be applied to the scrutinized sequences and categorized it into three planktonic foraminiferal (Globotruncanita elevata, Globotruncana ventricosa, and Globotruncana falsostuarti) biozones which are utterly equivalent to two calcareous nannofossil (CC20 and upper part of CC22) biozones. The consecutive Radotruncana calcarata planktonic foraminiferal biozone which locally might be equal to the Uniplanarius sissinghii (CC21) and lower part of the Uniplanarius trifidus (CC22) calcareous nannofossil biozones are lacking. It refers to absences of early Late Campanian which signify the Arabian Plate distinct tectonics and obduction of ophiolite across the northeastern border of Iraq. Moreover, four different microfacies were recognized that include foraminiferal mudstone, foraminiferal wackestone, glauconitic foraminiferal wackestone, and ferruginous foraminiferal mudstone which represent the deposition in open marine environment to submarine disconformity or diastems. © 2021, Saudi Society for Geosciences.
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