Lithostratigraphy and Microbiostratigraphy of Gadvan and Darian Formations in South Semirom, East of Zagros Basin, South-Central IranReportar como inadecuado




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This research focuses on the lithostratigraphy and microbiostratigraphy implicationsof the Gadvan and Darian Formations in a part of Zagros sedimentary basin. TheGadvan and Darian Formations in the study area with a thick-ness of 520 meters consistof gray to green marls and shales, dark-grey limestones and Orbitolina limestone with Late Barremian-Aptianage. According to the lithostratigraphic investigations, the Gadvan and Darian Formationsin the study area are subdivided into eleven units. The upper boundary of theDarian Formation with the Kazhdomi Formation and the lower boundary of GadvanFormation with the Fahliyan Formation are in the form of disconformity.Micropaleontological study of the Gadvan and Dariyan Formations has led to therecognition 20 families, 45 genera, 35 species of benthic foraminifera, 2genera of pelagic foraminifera and 8 genera and species of the calcareousalgae. In this research, three biozones have been recognized by distribution ofthe larger benthic foraminifera in the Gadvan and Dariyan Formations of theSouth Semirom, including: 1 Palorbitolinalenticularis-Choffatella decipiens Concurrent Range Zone middle Late Barremian toearly Early Aptian; 2 Praeorbitolinacormyi-Orbitolina Mesorbitolina lotzei Assemblage Zone late Early Aptian; 3: Orbitolina Mesorbitolina texanae-Orbitolina Mesorbitolina parva Assemblage Zone Middle to Late Aptian.Based on the identified foraminifera, the age of the Gadvan and Darian Formationsin the study area is assigned to Late Barremian to Aptian.

KEYWORDS

Lower Cretaceous, Foraminifera, Gadvan, Darian, Biozone, Zagros, Semirom

Cite this paper

Hamedanian, M. , Vaziri, S. , Shakarami, M. , Arian, M. and Arzani, N. 2017 Lithostratigraphy and Microbiostratigraphy of Gadvan and Darian Formations in South Semirom, East of Zagros Basin, South-Central Iran. Open Journal of Geology, 7, 119-131. doi: 10.4236-ojg.2017.72008.





Autor: Mohammad Kazem Hamedanian1, Seyed Hamid Vaziri2*, Mahnaz Amir Shakarami3, Mehran Arian1, Naser Arzani3

Fuente: http://www.scirp.org/



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