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Paleobiodiversity of Permian (Yakhtashian-Dzhulfian) small foraminifera in Abe-Garm, Gazvin section,

Document Type : Original Research Paper

Authors

1 Ph.D. Student, Department of Geology, Islamic Azad University Science and Research Branch, Tehran, Iran

2 Associate Professor, Department of Geology, Faculty of Earth Sciences, Kharazmi University of Tehran, Tehran, Iran

3 Assistant Professor, Department of Geology, Islamic Azad University Science and Research Branch, Tehran, Iran

4 Associate Professor, Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran

Abstract

Some  paleobiodiversity  indices such as total diversity, stand diversity, origination and extinction rates of Permian (Yakhtashian- Dzhulfian) small foraminifera were analyzed based from an outcrop in Abe-Garm area, Gazvin. Some important bizones that recognized by Taraz (1969), Taraz et al. (1981), Kobayashi (1997), Shabanian (2010), Stiger (1966), Davydov et al. (1996) were used for separation of stages, and biodiversity indices were calculated based on Foote (2000). The investigations are resulted in recognition of Two trends:1: Origination rate decrease  rapidly from Yakhtashian to Murgabian and,2: two rapid increase in the extinction rate are recorded in Midian and Dzhulfian, the  first comparable with End-Guadalopian mass extinction and the latter probably related to environmental condition.

Keywords

References
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Scientific Quarterly Journal of Geosciences
Volume 26, Issue 101 - Serial Number 101
VOL.26, NO101
December 2017
Pages 127-138
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