Microfacies, depositional condition and sequence stratigraphy of the Bahram Formation (Middle–Upper Devonian) in Kuh-e-Bande-Abdol-Hossein section, SE Anarak

رخساره‌های رسوبی

Article 7, Volume 12, Issue 1 - Serial Number 22, July 2019, Pages 109-132   

Document Type: مقالات پژوهشی

DOI: 10.22067/sed.facies.v12i1.71863

Authors

Bahareh Shakeri¹; Hossein Vaziri¹; Ali Bahrami^{* 1}; Peter Koenigshof²; Mohammad Ali Salehi¹

¹University of Isfahan

²Senckenberg Research Institute and Natural History Museum

Abstract

Introduction
During the Silurian and Devonian time, some parts of Iran, including Central Iran, Alborz and Sanandaj-Sirjan basins, along with the Turkey and Afghanistan plates had been connected to the Arabian and African plates; located on the northwestern margin of the Gondwana and southern Paleotethys (Berberian and King, 1981; Husseini, 1991; Sharland et al., 2001; Ruban et al., 2007; Al-Juboury and AL-Hadidy, 2009). The Devonian deposits represent a considerable distribution in Tabas Block and Central Iran. During the Devonian time, the Iranian platform was located in the southern hemisphere, near 30° latitudes. Outcrops of the Upper Paleozoic around Isfahan region mostly limited to the northern Isfahan (Soh and Natanz districts, Najhaf, Neqeleh, Varcamar, North Tar, east Kesheh sections; Bahrami et al., 2015), Northeast of Isfahan (Zefreh, Chahriseh, and Dizlu sections; Königshof et al., 2016) and south of Isfahan (Shahreza–Ramsheh area; Bahram et al., 2014). In order to investigate the microfacies and sedimentary environment of Bahram Formation in southeastern Anarak, Kuh-e-Bande- Abdol-Hossein section was selected and studied. Kuh-e-Bande-Abdol-Hossein section is located about 32 km southeastern Anarak and northeastern Isfahan in E: 53° 52' 55" and N: 33° 10' 90 " coordinates. The Anarak route toward Khur is the way to the section; after two kilometers, through a 25 km long unpaved road the study section could be accessed.
 
Materials and Methods
In order to study the sedimentary environment and identify the sedimentation process during the Middle and Upper Devonian Kuh-band-e-Abdolhossein section in Anarak region, 230 thin sections and a few polished slabs were prepared and process with laboratory techniques to study and identify the skeletal and non-skeletal components, texture and other microscopic characteristics. Microfacies textures were identified according to Dunham (1962), Embry and Klovan, 1971 schemes, and also the further standard models of Wilson (1975) and Flugel (2010) have been used. In order to distinguish calcite mineral from dolomite, all samples were stained by Alizarin red S solution (Dickson, 1965).
 
Discussion
The Bahram Formation in this section is 366 m thick and lithologically is composed of thin to thick-bedded limestone, an alternation of limestone and thin-bedded shale, sandy limestone and marly limestone. Based on facies changes and petrological properties, 16 microfacies were identified in this section. Investigation of the identified facies indicates the deposition of these microfacies has taken place in a carbonate ramp during the Middle and Late Devonian time in the study section in Anarak region. On the basis of vertical and lateral microfacies variations and their comparison with the sea level changes’ curve, sequence stratigraphic studies of the Bahram Formation led to the identification of seven fourth-order sequences in the study section. According to the obtained data, the first and the seventh sedimentary sequences are as parts of complete sedimentary sequences, while second to sixth sedimentary sequences are complete sequences including transgressive system tracts, high stand system tracts and maximum flooding surface as well as sequence boundaries.
 
Conclusion
The Bahram Formation in the Kuh-e-Bande-Abdol-Hossein section, SE Anarak with a thickness of 366 m is composed of thin to thick-bedded limestone, an alternation of limestone and thin-bedded shale, sandy limestone, and marl limestone. Microfacies analysis has led to the recognition of 16 microfacies and their lateral and vertical distribution show that carbonates were deposited on a ramp type carbonate platform. Storm deposit or very slight steepened slope resulted in the deposition of very rare redeposited fine-grained bioclasts in the deeper part of the platform. According to the sequence, stratigraphy analysis seventh fourth-order depositional sequences are recognized in the Bahram Formation. Microfacies analysis indicates that this section shows rather deeper paleoenvironments in comparison to the previously studied sections of the Bahram Formation in Central Iran.
 
Keywords: Bahram Formation; microfacies; sedimentary environment; sequence stratigraphy; Upper Givetian-Upper Famennian; Kuh-e-Bande-Abdol-Hossein.
 
Reference
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Keywords

microfacies; sedimentary environment; Sequence stratigraphy; Upper Givetian-Upper Famennian; Kuh-e-Bande-Abdol-Hossein

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