Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Paleoecology of the Qom Formation ostracods in eastern Sirjan and southwestern Kashan (Sanandaj-Sirjan Fore-Arc Basin)

Document Type : Original Research Paper

Authors
Ebrahim Mohammadi 1
Mohammad Javad Hassani 2
1 Assistant professor, Department of Ecology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
2 Assistant professor, Department of Ecology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology,, Kerman, Iran
10.22071/gsj.2020.223762.1772
Abstract
Paleoecology of the Qom Formation ostracods in the Bojan and Varkan sections have been studied. The age of the sections has determined base on foraminifera and is Rupelian-chattian for the Bujan and Chattian for the Varkan Section. Ostracoda content of the Bujan and Varkan sections include 44 and 33 species respectively. The pecies of genus Cytheridea are the most abundant and the most dominant ostracods of the Bujan section. In the lower part of the Bujan section, different species of Cytherella and Cytheridea constitute the dominant ostracods, but upward the abundance of Cytherella is declined and Cytheridea, Neonesidea, and Bairdia are dominant. Podocopids constitute 76% and 86% of the Bujan section ostracods during Rupelin and Chattian, respectively. Neonesidea elegans, Bythocypris pseudoreniformis, Paracypris pandyai, Paracypris sapperi and Paracypris naalunensis constitute the dominant ostracods of the Varkan Section. Podocopid ostracods are dominant in the Varkan marls and constitute 77% of the ostracods. The high percentage of podocopid ostracods indicates that the environment was oxygen-rich and without the ecological stresses in both section; while in the Varkan Section, the ecological conditions are stable but in the Bujan section, the oxygen enriches upward and ecological conditions become closer to normal marin basins.
Keywords
Qom Formation
Sanandaj-Sirjan
ostracod
paleoecology
podocopid

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 31, Issue 2 - Serial Number 120
Volume 31, Issue 2, Serial Number 120, Summer 2021
Summer 2021
Pages 65-78