| Foraminiferal Biostratigraphy of the Mobarak Formation (Lower Carboniferous) in Kiyasar Area, SE Sari, Northern Iran |
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| 作者姓名： | Mostafa FALAHATGAR Hossein MOSADDEGH and Mahnaz Parvanehnejad SHIRAZI |
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| 作者单位： | 1 Department of Geology, Payame Noor University, PO BOX 19395-3697 Tehran, IRAN. 2 Department of Earth Science, Damghan University, PO Box 36715-364, Damghan, IRAN |
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| 基金项目： | This paper is the result of MSc dissertation of Stratigraphy and Paleontology at the Payame Noor University of Shiraz, Iran. |
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| 摘 要： | The Mobarak Formation is near the town of Kiyasar in the south-east of Sari city, northern Iran. This formation conformably overlies the Geirud Formation (Upper Devonian). The lower part of the Mobarak Formation consisting of shales and thin- to medium-bedded limestone toward the top of these sequences changes into alternations of dark limestone and interbedded gray to black shales. Weathered yellow thick-bedded shales are observed at the top of the section. This formation is covered unconformably by sandstones attributed to the Dorud Formation (Lower Permian). The thickness of the formation in this region is 250 m. Four rock units have been recognized in this section. Foraminiferal biostratigraphy shows that the age of the Mobarak Formation in the Kiaysar region ranges from Lower Tournaisian to Early Middle Visean. The foraminifer Zones FAZ1 and FAZ2 are correlated with the Lower Tournaisian and Upper Tournaisian, whereas Zones FAZ3 and FAZ4 correlate with the Visean. Affinities exist between specimens recorded in the Kiyasar section with species known from other regions in eastern and Central Alborz, but there are important differences in their appearance.
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| 关 键 词： | Foraminifera Kiyasar Lower Carboniferous Mobarak Formation |
| 收稿时间： | 2011/10/10 0:00:00 |
| 修稿时间： | 2012/5/16 0:00:00 |
Foraminiferal Biostratigraphy of the Mobarak Formation (Lower Carboniferous) in Kiyasar Area,SE Sari,Northern Iran |
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| Authors: | Mostafa FALAHATGAR Hossein MOSADDEGH Mahnaz Parvanehnejad SHIRAZI |
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| Abstract: | The Mobarak Formation is near the town of Kiyasar in the south‐east of Sari city, northern Iran. This formation conformably overlies the Geirud Formation (Upper Devonian). The lower part of the Mobarak Formation consisting of shales and thin‐ to medium‐bedded limestone toward the top of these sequences changes into alternations of dark limestone and interbedded gray to black shales. Weathered yellow thick‐bedded shales are observed at the top of the section. This formation is covered unconformably by sandstones attributed to the Dorud Formation (Lower Permian). The thickness of the formation in this region is 250 m. Four rock units have been recognized in this section. Foraminiferal biostratigraphy shows that the age of the Mobarak Formation in the Kiaysar region ranges from Lower Tournaisian to Early Middle Visean. The foraminifer Zones FAZ1 and FAZ2 are correlated with the Lower Tournaisian and Upper Tournaisian, whereas Zones FAZ3 and FAZ4 correlate with the Visean. Affinities exist between specimens recorded in the Kiyasar section with species known from other regions in eastern and Central Alborz, but there are important differences in their appearance. |
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| Keywords: | Foraminifera Kiyasar Lower Carboniferous Mobarak Formation |
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