Arkan Osman | Soran University (original) (raw)

Papers by Arkan Osman

The lithological study of the Naokelekan Formation shows that this formation is mainly composed o... more The lithological study of the Naokelekan Formation shows that this formation is mainly composed of organic carbonaceous calcareous mudrocks with some carbonates including limestone and dolomite. The exact describtion of the lithological composition of Naokelekan Formation in two selected studied sections from bottom to top is (a) black, soft, sheety, fetid, highly bituminous, calcareous shale, dark brown, fetid, thin-medium bedded bituminous limestone and dolomitic limestone, (b) dark grey, hard, fine-grained, fossiliferous, highly mottled and stylolitic, medium-thick bedded limestone and dolomitic limestone, (c) black, calcareous, sheety, soft, fetid shale and dark grey, medium-grained, hard, dolomitic and argillaceous limestone. Depending on the lithology and microfacies analysis, its indicated that the formation was deposited in two different sedimentary environments including lagoon (subtidal) environment for both lower and upper units of the formation and shallow open marine environment for middle unit of the formation. It was inferred that in all sections, the upper contact with the Barsarin Formation and lower contact with Sargelu Formation is somewhat controversial but mainly agreed by many researchers to be conformable and gradational.

The lithological study of the Naokelekan Formation shows that this formation is mainly composed o... more The lithological study of the Naokelekan Formation shows that this formation is mainly composed of organic carbonaceous calcareous mudrocks with some carbonates including limestone and dolomite. The exact describtion of the lithological composition of Naokelekan Formation in two selected studied sections from bottom to top is (a) black, soft, sheety, fetid, highly bituminous, calcareous shale, dark brown, fetid, thin-medium bedded bituminous limestone and dolomitic limestone, (b) dark grey, hard, fine-grained, fossiliferous, highly mottled and stylolitic, medium-thick bedded limestone and dolomitic limestone, (c) black, calcareous, sheety, soft, fetid shale and dark grey, medium-grained, hard, dolomitic and argillaceous limestone. Depending on the lithology and microfacies analysis, its indicated that the formation was deposited in two different sedimentary environments including lagoon (subtidal) environment for both lower and upper units of the formation and shallow open marine environment for middle unit of the formation. It was inferred that in all sections, the upper contact with the Barsarin Formation and lower contact with Sargelu Formation is somewhat controversial but mainly agreed by many researchers to be conformable and gradational.