In the present study, selected the Kometan Formation (Late Turonian - Early Campanian) from the D... more In the present study, selected the Kometan Formation (Late Turonian - Early Campanian) from the Dokan area, NE-Iraq. In this formation studied Ostracoda and identified fifteen open Ostracoda species belonging to ten genera (Bairdia, Bairdiacypris, Bythocypris, Bairdoppilata, Cavellina, Cypridina, Cytherella, Haplocytheridea, Pterygocythereis, and Paracypris). The goal of the present study is to identify Ostracoda species under polarizing microscopes for the first time in the Kometan Formation in the Dokan area. The Ostracoda assemblage such as Bairdia, Bairdiacypris, Cytherella, Cypridina, and Paracypris with foraminifera species Globotruncana linneiana, Globotruncanita stuartiformis, Marginotruncana schneeansi, and Dicarinella asymetrica indicate the Kometan Formation deposited in the deep marine environment.
The sequence of the coastal siliciclastic facies of the Paleocene-Eocene Zagros Foreland Basin is... more The sequence of the coastal siliciclastic facies of the Paleocene-Eocene Zagros Foreland Basin is well exposed in the Chwarta-Mawat area, north of Sulaimani Governorate, northeastern Iraq. According to previous studies, this sequence is designated as Red Beds Series (RBS), consisting of more than 2000 m of fine and coarse red and grey clastics. The present study found recently recognized lithologies (RRLs) about 100 thick inside the series and encompassed green marlstone with subsidiary detrital limestone which has significant tectonic and paleogeographic results. The petrography, biostratigraphy, and boundary conditions studies are applied to uncover their origin. The new lithologies are deposited in the subsiding basin in the Imbricate Zone during the Middle Eocene. During this age, the Tertiary Foreland Basin was separated by a paleohigh into two basins, (northern and southern basins). In the northern basin, the RRLs have deposited as deep facies of the Naopurdan Formation while in the southern basin the Pila Spi Formation was deposited as lagoonal facies. The former formation was deposited as reefal facies in the shelf area of the northern basin to the northeast Chawrta and Mawat Towns. The RRLs, units one and two of the series (in the Thrust Zone) are correlated respectively with Pila Spi, Sinjar and Gercus formations in the High Folded Zone. These correlations are shown on the stratigraphic columns and paleogeographic models with the aid of nannofossil and benthonic foraminiferal studies. This study is the most important step for solving the tectonic and paleogeographic setting of northeastern Iraq and for a better understanding of the Zagros Collisional belt.
Thick succession of conglomeratic limestone (about 300 m thick) is exposed on right and left side... more Thick succession of conglomeratic limestone (about 300 m thick) is exposed on right and left sides of Dokan reservoir and covers more than 40 Km2 of surface area. It called "Dokan Conglomerate" in this study, which is not described and shown on any geological map, previously. The Dokan conglomerate is indurate and weathering resistant, which mostly consists of blocks, boulders and gravels of Qamchuqa Formation, with some clasts of Kometan Formation, and at the upper part rare clasts of Pila Spi Formation can be observed. The conglomerate is folded and in some place has more than 30 degrees, and angularly overlies the Kolosh, Shiranish, Kometan formations with more than 20 degrees difference in dip. In other areas, the conglomerate shows, more or less equal dip with aforementioned formations. The paleocurrent analysis revealed southwest, south, southeast direction for lower, middle and upper part of the conglomerate. From indicating the origin of the pebbles of the conglome...
Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) de... more Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) deep marine sediments of the Shiranish Formation of Dokan area. They were collected using a new technique for releasing ostracod shells from a bluish white marl and marly limeston (hemipelagite). Twenty-two ostracod species are identified, belonging to the genera Bythocypris, Cytherella, Cypridopsis, Eucypris, Krithe, Mongolianella, Paracypris, Paracypretta, Parakrithe and Xestoleberis. Only eight ostarcods species belonging to ten genera are systematically described as detail. The ostracod fauna supports a Late Cretaceous (Late Campanian-Early Maastrichtia) age for the Shiranish Formation of Dokan area.
New simplified tectonic models and depositional history of Late Cretaceous rocks are established ... more New simplified tectonic models and depositional history of Late Cretaceous rocks are established in a part of Zagros Orogenic Belt that is located in the Northeastern Iraq. These rocks constitute the most important Cretaceous oil reservoir in the Middle East. The dependent tools are petrography, field study and the concept of drowning phases. This concept is relatively new and accurate in explanation of development of growth of carbonate sequences and their termination by tectonic or environmental constrains. The columns of both carbonate and clastics rocks of the area are divided into three phases of drowning: 1-Pre-drowning phase of reefal limestone which is represented by Qamchuqa Formations (Mauddud and Shuaba fns in the south Iraq and in the Gulf). 2-Transitional phase of pelagic limestone and marl deposition which is transitional to post drowning phase during which Gulneri Shale and Dokan limestone Formations (Cenomanian-Turonian) are deposited. 3-Post drowning phase of deep carbonate sedimentation during which Kometan Formation (Santonian-Campanian) and 4-Burial Phase in which Shiranish and Tanjero Formations (Maasstrichtian) are deposited by which Arabian Platform was covered by siliciclastics sediments and main carbonate sedimentation was ended during Campanian in the studied area due to continental colliding of the Iranian and Arabian plates. These phases, as shown by suitable diagrams, are resulted from tectonics of Zagros and can replace the previously assigned complex tectonic and depositional history of the area during Later Cretaceous. The application of the phases revealed nearly a continuous history of deposition in foredeep during Early Cretaceous and foreland basin during later ages.
Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) de... more Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) deep marine sediments of the Shiranish Formation of Dokan area. They were collected using a new technique for releasing ostracod shells from a bluish white marl and marly limeston (hemipelagite). Twenty-two ostracod species are identified, belonging to the genera Bythocypris, Cytherella, Cypridopsis, Eucypris, Krithe, Mongolianella, Paracypris, Paracypretta, Parakrithe and Xestoleberis. Only eight ostarcods species belonging to ten genera are systematically described as detail. The ostracod fauna supports a Late Cretaceous (Late Campanian-Early Maastrichtia) age for the Shiranish Formation of Dokan area.
In the present study, selected the Kometan Formation (Late Turonian - Early Campanian) from the D... more In the present study, selected the Kometan Formation (Late Turonian - Early Campanian) from the Dokan area, NE-Iraq. In this formation studied Ostracoda and identified fifteen open Ostracoda species belonging to ten genera (Bairdia, Bairdiacypris, Bythocypris, Bairdoppilata, Cavellina, Cypridina, Cytherella, Haplocytheridea, Pterygocythereis, and Paracypris). The goal of the present study is to identify Ostracoda species under polarizing microscopes for the first time in the Kometan Formation in the Dokan area. The Ostracoda assemblage such as Bairdia, Bairdiacypris, Cytherella, Cypridina, and Paracypris with foraminifera species Globotruncana linneiana, Globotruncanita stuartiformis, Marginotruncana schneeansi, and Dicarinella asymetrica indicate the Kometan Formation deposited in the deep marine environment.
The sequence of the coastal siliciclastic facies of the Paleocene-Eocene Zagros Foreland Basin is... more The sequence of the coastal siliciclastic facies of the Paleocene-Eocene Zagros Foreland Basin is well exposed in the Chwarta-Mawat area, north of Sulaimani Governorate, northeastern Iraq. According to previous studies, this sequence is designated as Red Beds Series (RBS), consisting of more than 2000 m of fine and coarse red and grey clastics. The present study found recently recognized lithologies (RRLs) about 100 thick inside the series and encompassed green marlstone with subsidiary detrital limestone which has significant tectonic and paleogeographic results. The petrography, biostratigraphy, and boundary conditions studies are applied to uncover their origin. The new lithologies are deposited in the subsiding basin in the Imbricate Zone during the Middle Eocene. During this age, the Tertiary Foreland Basin was separated by a paleohigh into two basins, (northern and southern basins). In the northern basin, the RRLs have deposited as deep facies of the Naopurdan Formation while in the southern basin the Pila Spi Formation was deposited as lagoonal facies. The former formation was deposited as reefal facies in the shelf area of the northern basin to the northeast Chawrta and Mawat Towns. The RRLs, units one and two of the series (in the Thrust Zone) are correlated respectively with Pila Spi, Sinjar and Gercus formations in the High Folded Zone. These correlations are shown on the stratigraphic columns and paleogeographic models with the aid of nannofossil and benthonic foraminiferal studies. This study is the most important step for solving the tectonic and paleogeographic setting of northeastern Iraq and for a better understanding of the Zagros Collisional belt.
Thick succession of conglomeratic limestone (about 300 m thick) is exposed on right and left side... more Thick succession of conglomeratic limestone (about 300 m thick) is exposed on right and left sides of Dokan reservoir and covers more than 40 Km2 of surface area. It called "Dokan Conglomerate" in this study, which is not described and shown on any geological map, previously. The Dokan conglomerate is indurate and weathering resistant, which mostly consists of blocks, boulders and gravels of Qamchuqa Formation, with some clasts of Kometan Formation, and at the upper part rare clasts of Pila Spi Formation can be observed. The conglomerate is folded and in some place has more than 30 degrees, and angularly overlies the Kolosh, Shiranish, Kometan formations with more than 20 degrees difference in dip. In other areas, the conglomerate shows, more or less equal dip with aforementioned formations. The paleocurrent analysis revealed southwest, south, southeast direction for lower, middle and upper part of the conglomerate. From indicating the origin of the pebbles of the conglome...
Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) de... more Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) deep marine sediments of the Shiranish Formation of Dokan area. They were collected using a new technique for releasing ostracod shells from a bluish white marl and marly limeston (hemipelagite). Twenty-two ostracod species are identified, belonging to the genera Bythocypris, Cytherella, Cypridopsis, Eucypris, Krithe, Mongolianella, Paracypris, Paracypretta, Parakrithe and Xestoleberis. Only eight ostarcods species belonging to ten genera are systematically described as detail. The ostracod fauna supports a Late Cretaceous (Late Campanian-Early Maastrichtia) age for the Shiranish Formation of Dokan area.
New simplified tectonic models and depositional history of Late Cretaceous rocks are established ... more New simplified tectonic models and depositional history of Late Cretaceous rocks are established in a part of Zagros Orogenic Belt that is located in the Northeastern Iraq. These rocks constitute the most important Cretaceous oil reservoir in the Middle East. The dependent tools are petrography, field study and the concept of drowning phases. This concept is relatively new and accurate in explanation of development of growth of carbonate sequences and their termination by tectonic or environmental constrains. The columns of both carbonate and clastics rocks of the area are divided into three phases of drowning: 1-Pre-drowning phase of reefal limestone which is represented by Qamchuqa Formations (Mauddud and Shuaba fns in the south Iraq and in the Gulf). 2-Transitional phase of pelagic limestone and marl deposition which is transitional to post drowning phase during which Gulneri Shale and Dokan limestone Formations (Cenomanian-Turonian) are deposited. 3-Post drowning phase of deep carbonate sedimentation during which Kometan Formation (Santonian-Campanian) and 4-Burial Phase in which Shiranish and Tanjero Formations (Maasstrichtian) are deposited by which Arabian Platform was covered by siliciclastics sediments and main carbonate sedimentation was ended during Campanian in the studied area due to continental colliding of the Iranian and Arabian plates. These phases, as shown by suitable diagrams, are resulted from tectonics of Zagros and can replace the previously assigned complex tectonic and depositional history of the area during Later Cretaceous. The application of the phases revealed nearly a continuous history of deposition in foredeep during Early Cretaceous and foreland basin during later ages.
Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) de... more Ostracods are described for the first time from Late Cretaceous (Late Campanian-Maastrichtian) deep marine sediments of the Shiranish Formation of Dokan area. They were collected using a new technique for releasing ostracod shells from a bluish white marl and marly limeston (hemipelagite). Twenty-two ostracod species are identified, belonging to the genera Bythocypris, Cytherella, Cypridopsis, Eucypris, Krithe, Mongolianella, Paracypris, Paracypretta, Parakrithe and Xestoleberis. Only eight ostarcods species belonging to ten genera are systematically described as detail. The ostracod fauna supports a Late Cretaceous (Late Campanian-Early Maastrichtia) age for the Shiranish Formation of Dokan area.
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