Lithostratigraphic and facies analyses of the Sarcheshmeh Formation (Lower Cretaceous) in the eastern Kopet Dagh Basin, NE Iran

The Kopet Dagh Basin is located in north-east Iran where sedimentation continued throughout the Jurassic–Tertiary. The area studied is in the easternmost part of the basin. Two stratigraphic sections representing mainly the Lower Aptian Sarcheshmeh Formation have been measured. The Sarcheshmeh Forma...

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Bibliographic Details
Published in:Cretaceous research 2000-08, Vol.21 (4), p.507-516
Main Authors: Raisossadat, Naser, Moussavi-Harami, Reza
Format: Article
Language:English
Subjects:
Aptian
Iran
Kopet Dagh Basin
lithostratigraphy
Lower Cretaceous
microfacies
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Summary:The Kopet Dagh Basin is located in north-east Iran where sedimentation continued throughout the Jurassic–Tertiary. The area studied is in the easternmost part of the basin. Two stratigraphic sections representing mainly the Lower Aptian Sarcheshmeh Formation have been measured. The Sarcheshmeh Formation in one of these sections (Mozduran) is about 200m thick. It thins towards the other section (Baghak) in easternmost part of the basin where it about 150m thick. It is conformably overlain by the Sanganeh Formation and underlain by the Tirgan Formation. Four different facies have been recognized; pelmicrite, mudstone–micritic limestone, biomicrite–bio-oomicrite and biosparite–oosparite. They reflect deposition on a carbonate ramp. Many small-scale shallowing-upward cycles (parasequences) have also been identified within transgressive and high stand system tracts. The cyclicity was probably related to subsidence, which in turn was related to both sediment loading and tectonics.
ISSN:0195-6671
1095-998X
DOI:10.1006/cres.2000.0216