The Frasnian-Famennian shelf deposits of the Bahram Formation in the Shams Abad section Kerman province, Central Iran: facies and sequence stratigraphy

The Frasnian-Famennian shelf deposits of the Bahram Formation in the Shams Abad section Kerman province, Central Iran: facies and sequence stratigraphy

Afshin hashmie1*, Fariba nikbakht1, Peiman rezaee1, Mansour ghorbanie1, Ali rostam nejad1 & Azam zare 2

1 Department of Geology, Faculty of Science, Hormozgan University of Bandar Abbs, Iran 

2 Department of Geology, Faculty of Science, Payam noor Shiraz University of Shiraz, Iran

e-mail: Hashmieafshin@gmail.com



Article info
Original: 23 Oct. 2014
Revised: 21 Dec. 2014
Accepted: 21 Jan. 2015
Published online:  
             20 March  2015

Key Words:
Bahram Formation
 Frasnian-Famennian
Central Iran
 Facies
 Sequence stratigraphy


Abstract

Bahram Formation is a carbonate-clastic sequence of Late Devonian (Frasnian–Famennian) age and is deposited at the Central Iran sedimentary basin, Iran. In this investigation, Bahram Formation has been studied at Shams Abad section. Facies analysis and petrographic studies led to the recognition of 9 microfacies that are deposited in five facies belts: shore, tidal flat, lagoon, shoal and shallow open marine. The observed facies patterns indicate a mix carbonate-clastic shelf depositional environment. The shelf margin is formed as a result of tectonic activity associated with Hercynian orogeny passive margin in northeast Gondwana. Based on field observations, microfacies analysis and sequence stratigraphic concepts three, third-order sequences in this section. Sequences 3 joint with Hutk Formation (Carboniferous) are identified, on the basis of shallowing upward patterns. The transgressive deposits display a predominance of deep subtidal facies, while highstand deposits show shallow subtidal facies.


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