Lithostratigraphy and microfacies analysis of Avanah Formation (Middle Eocene) in Gomaspan section northeast Erbil City, Kurdistan region, Iraq

نویسندگان

چکیده

Lithostratigraphy and microfacies analysis of the Avanah Formation (Middle Eocene) were studied in Gomaspan section Bina Bawi anticline, northeast Erbil city, Kurdistan Region, Iraq. The field observations refer that formation attains 56 m medium to thick bedded yellow limestone, grey dolomitic limestone blue marly interbedded with thin beds marl dark shale an interval sandy middle part red mudstone. petrographic study 29 sections carbonates revealed majority matrix is carbonate mud (micrite) few microspar. skeletal grains include benthic foraminifera, dasycladacean green algae, ostracods, calcispheres, pelecypods, rare planktonic foraminifera bryozoa addition bioclasts. Non-skeletal encompass peloids, oncoids, intraclasts extraclasts common monocrystalline quartz. Based on observation analysis, three different lithostratigraphic units identified. They are ascending order: A-Thick shale. B- Bedded Depending detailed rocks, main 12 submicrofacies recognized. From sum all petrographic, facies, textural analyses, it concluded section, was deposited shallow marine environment, semi restricted lagoon, lower upper parts open lagoon environment interval.

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ژورنال

عنوان ژورنال: kuwait journal of science

سال: 2021

ISSN: ['2307-4108', '2307-4116']

DOI: https://doi.org/10.48129/kjs.11183