The Chehel Kaman Formation of the upper Paleocene age formed from carbonate and siliciclastic sediments is located, in the Kapeh Dagh Sedimentary Basin. Two sections where considered for the purpose of research into the effective diagenetic processes of this formation. More
The Chehel Kaman Formation of the upper Paleocene age formed from carbonate and siliciclastic sediments is located, in the Kapeh Dagh Sedimentary Basin. Two sections where considered for the purpose of research into the effective diagenetic processes of this formation. The Cheshmeh Qorban section with a thickness of 270.8m located 140km down the Mashhad – Sarakhs Highway while the Shourlog Section with a thickness of 288.3m is situated 130km down the Mashhad – Mozduran – Sarakhs Highway. 120 samples were taken from these sections and 100 thin cross sections produced from these samples. The carbonate rocks of this formation have been affected by diagenetic processes such as cementation, micritization, neomorphism, dissolution stress and porosity. These processes have taken place at the four marine diagenetic stages of the underground and surface sweet water. All cross sections were investigated using a gypsum bladein order to identify any extant porosity. All changes including type and percentage were plotted for each section. The results of the investigations indicated that in the Cheshmeh Qorban section of the Chehel Kaman Formation the lowest porosity content with a 3% rate of recurrence was related to microporosities while the greatest accumulation of porosity with a 7% recurrence rate in porosity was due to fracture porosity. In the Shourlog section meanwhile the lowest porosity content with a 2% recurrence rate was related to microporosities and the greatest accumulation with a recurrence rate of 6% was due to vuggy porosity.
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Paleocene and Lower Eocene deposits in SW Iran are known as Pabdeh formation.Pabdeh formation is one of the most important lithostratigraphy unit as source rock has been deposited in Zagros basin over an extremely long period in time. The area under research is th More
Paleocene and Lower Eocene deposits in SW Iran are known as Pabdeh formation.Pabdeh formation is one of the most important lithostratigraphy unit as source rock has been deposited in Zagros basin over an extremely long period in time. The area under research is the Ghachsaran 55 subsurface Section located from the Ghachsaran oil field in Dezful embeyment in zagros fold zone. The Lower boundry of this formation around Ghachsaran basin is identified by Gurpi formation. Study on lithostratigraphy of Paleocene and lower Eocene deposits have been led to the separation following units: clay limestone section in gray colour,11m in thickness, clay limestone section 18m in thickness containing chert inter layers, silt clay limestone section 3m in thickness, The clay limestone section 3m in thickness containing chert interlayers, clay limestone section 4m in thickness . biostratigraphy investigation of Pabdeh formation have been led to the identification of 39 species and 9 genera of foraminifers.In addition , basis of Paleocene- Early Eocene planktonicforamimnifers bioevent in Wade biozonation such as Morozovella velascoensis, Globanomalina pseudomenardii, Psudohastigerina wilcoxensis, Acarinina soldadoensis , Morozovella subbotinae , Morozovella formosa , 9 biozones and 4 subzones are recogenized and these correlated with oldest biozones of (Wynd 1965) Beside,the bio-boundary of Paleocene and early Eocene is identified based on (Wade et al. 2011).
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The Razei region in the northwest of Ardabil is considered a part of West Alborz-Azerbaijan. Rocks in this area were created by Eocene volcanic activities. These rocks range from andesite to olivine basalt. The common texture of these rocks is Porphyritic with microlith More
The Razei region in the northwest of Ardabil is considered a part of West Alborz-Azerbaijan. Rocks in this area were created by Eocene volcanic activities. These rocks range from andesite to olivine basalt. The common texture of these rocks is Porphyritic with microlithic matrix. The phenocrysts of these rocks are often clinopyroxene, plagioclase, and olivine. The texture is made of microlithic plagioclase and fine crystals of pyroxene. The studied rocks have clear desire to alkali basalts in terms of chemical nomenclature. Disequilibrium factors between liquid and crystal show the processes of magmatic evolution in an open thermodynamic system. The mixed climate in this region has probably contributed the most to changing the chemical composition of these rocks. In the spider diagrams, enrichments often include some LIL elements and depletions usually include some HFS elements. Enrichment of LILE is probably accompanied with the contamination of the basic magma with materials from continental lithosphere. The volcanic rocks in Razei have mainly geochemical characteristics of back arc basin, and the magmas that created the rocks in this region have an origin of lithospheric mantle.
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In this research, biostratigraphy related to the carbonate succession of the Shahbazan Formation at the southeastern flank of Chenar anticline, Lurestan Basin, is discussed. A study of large benthic foraminifera from the 294 mthick Shahbazan Formation led to the identif More
In this research, biostratigraphy related to the carbonate succession of the Shahbazan Formation at the southeastern flank of Chenar anticline, Lurestan Basin, is discussed. A study of large benthic foraminifera from the 294 mthick Shahbazan Formation led to the identification of two Middle Eocene biozones: Somalina sp. Zone, Nummulites-Alveolina Assemblage Zone. The age of the Shahbazan Formation in the study area is determined as Middle Eocene. The Shahbazn Formation overlies the Pabdeh Formation and underlies Asmari Formation in the studied stratigraphic section. The lower part of Asmari Formation is characterized by thick – bedded of limestone, with Nerpherolepidina sp., which reflects deposition during Chattian age. In this study, we introduced a paraconformity between Shabazan and Asmari Formations which is attributed to the PriabonianChattian.
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Kopet-Dagh basin is located in north and northeast of Iran. Khangiran Formation is one of the most importantformations of Paleogene deposits. For study of Khangiran Formation, Chehelkaman Syncline section wasselected. This section located in southwest of Sarakhs city, e More
Kopet-Dagh basin is located in north and northeast of Iran. Khangiran Formation is one of the most importantformations of Paleogene deposits. For study of Khangiran Formation, Chehelkaman Syncline section wasselected. This section located in southwest of Sarakhs city, east of Kopet-Dagh basin. Thickness of this section is136 meters and lithology of this section composed alternation of olive green Marl and limy yellow Marl. In thisresearch foraminifera fauna of Khangiran Formation was studied. The age of this section is Early-MiddleEocene, and planktonic foraminifera fauna of this section shows anomaly. Based on this anomaly, lack ofMorozovellids, that are index fossils of Eocene, was observed. Eutrophic condition of this Formation as for theplanktonic and benthonic foraminifera study is the reason of this subject that it's the result of changes in thepaleoceanographic conditions such as situation of stratification of water column and nutrient changes. As far theMorozovellids can't accordance with eutrophic condition, lack of the species mans of this genus observed forKhangiran Formation. Khangiran Formation condition is comparable with Caucasus basin and this subject can beindicating of same condition of this two basin at least during the Eocene time.
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