Benthic Foraminiferal and Calcareous Algae Assemblages in the Tirgan Formation (Urgonien Facies Type) in South Flank of Ghorogh Syncline (North of Chenaran), NE Iran

Hoda Yavarmanesh,Mohsen Pourkermani,Ebrahim Khademi Bouriabadi,Seyed Hamid Vaziri,Ali Asghar Aryaei,Davood Jahani

doi:10.4236/ojg.2017.76054

Hoda Yavarmanesh, Mohsen Pourkermani + Show 4 more

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https://doi.org/10.4236/ojg.2017.76054

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Abstract

In this research, the Tirgan Formation in the south flank of Ghorogh Syncline (north of Chenaran), northeastern Iran with the thickness of 251 was studied. This section consists of limestone, marly limestone and shale with impressions of echinoderms toxasteridae family, many of foraminifera from orbitolinidae family and also lots of calcareous algae that create facies variation along with other non-skeletal allochems. Micropaleontological investigation has been carried out on 90 thin-sections. These criteria reveal that an equivalent of the Urgonian facies type (in France-Swiss area) and open marine, low depth sedimentary basin are extended in the Kopet-Dagh basin. In this article, we tried to introduce some of the important foraminiferal and calcareous algal assemblages of this area.

Highlights

IntroductionThe Tirgan Formation is a Lower Cretaceous succession in the Kopet Dagh basin in northeast of Iran which mainly consists of micritic limestones, thick-bedded bio-micritic limestones, shaly limestones, marly limestones and bio-sparite limestones [1]
This section consists of limestone, marly limestone and shale with impressions of echinoderms toxasteridae family, many of foraminifera from orbitolinidae family and lots of calcareous algae that create facies variation along with other non-skeletal allochems
The Tirgan Formation is a Lower Cretaceous succession in the Kopet Dagh basin in northeast of Iran which mainly consists of micritic limestones, thick-bedded bio-micritic limestones, shaly limestones, marly limestones and bio-sparite limestones [1]

Summary

Introduction

The Tirgan Formation is a Lower Cretaceous succession in the Kopet Dagh basin in northeast of Iran which mainly consists of micritic limestones, thick-bedded bio-micritic limestones, shaly limestones, marly limestones and bio-sparite limestones [1]. The study area is located in south flank of Ghorogh Syncline (north of Chenaran) in the Kopet-Dagh basin with coordinates: 36 ̊50'38"N and 59 ̊02'38"E (Figure 1). The Tirgan Formation in study area with a thickness of 251 m, consists

Geological Setting

Discussion

Conclusions