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      • Open Access Article

        1 - Diagenesis, microfacies and determination of original carbonate mineralogy of the Asmari Formation in the southern flank of Rig anticline
         Kakemem hamid mirmohammadsadeghi
        The aim of this study is to recognize diagenetic processes, microfacies and geochemical evidence for original carbonate mineralogy of Oligocene- Miocene Asmari limestone deposited in the Rig anticline at Rig mountain oil field. In this area, the Asmari Formation with a More
        The aim of this study is to recognize diagenetic processes, microfacies and geochemical evidence for original carbonate mineralogy of Oligocene- Miocene Asmari limestone deposited in the Rig anticline at Rig mountain oil field. In this area, the Asmari Formation with a thickness of 364 m have been exposed as a sequence of thin, medium, thick, and massive carbonate rocks. Twelve microfacies types have been distinguished on the basis of depositional textures, petrographic analysis and fauna. These carbonate microfacies belong to four major sub-environments including tidal flat, lagoon, bar/ shoal, and open marine. Absence of turbidite deposits, reefal belt and gradual changes in facies indicated that the Asmari Formation was deposited in a homoclinal carbonate ramp environment. The main diagenetic processes includes: dolomitization, cementation, micritization, dissolution, and compaction. Petrographic evidence and variation of major and minor element and compare this information with modern aragonite warm water and calcitic cool to cold temperate carbonate and originally aragonite mineralogy of Ordovician sub-tropical carbonate, the calcite mineralogy of Permian sub-polar cold water of Tasmania, the Upper Jurassic aragonite Mozduran limestone, the Ilam carbonate formation, and the Fahliyan Formation indicate that original carbonate mineralogy was aragonite in the Asmari Formation. High Sr/Na ratio suggests original aragonite mineralogy. Variation of Sr and Na values versus Mn confirm replacement of aragonite by calcite during the two stages of diagenetic stabilization. The bivariate plot of Sr/Ca versus Mn shows that Asmari limestone have been influenced by meteoric diagenesis in a closed to semi-closed diagenetic system. Manuscript profile
      • Open Access Article

        2 - Lithostratigraphy and biostratigraphy of the Asmari Formation in southern flank of Mish anticline (Tang-e-Ganaveh)
        Farzad Moradi Abbas Sadeghi Hasan Amiri Bakhtiar
        The Asmari Formation in the southern flank of Mish anticline (in the north of Gachsaran) with a total thickness of 366 m is mainly composed of medium to thick limestone layers. Based on lithological studies, it is mainly composed of a periodic arrangement of marly lime More
        The Asmari Formation in the southern flank of Mish anticline (in the north of Gachsaran) with a total thickness of 366 m is mainly composed of medium to thick limestone layers. Based on lithological studies, it is mainly composed of a periodic arrangement of marly limestone with very thick, thick and medium bedded limestone layers and in some parts it consists of dolomitic layers. The lower contact of the Asmari Formation with Pabdeh Formation is gradual and its upper contact with the Gachsaran Formation is conformable with some sharp lithological changes. Based on change in thickness of layers, color and lithology, this carbonate sequence is subdivided into three lithological units. In Biostratigraphic studies, 28 species belonging to 41 genera of foraminifera were recognized. According to recognized biozone and foraminifera assemblages, 4 biozones and one undetermined zone were classified according to Laursen et al., 2009. The age of the Asmari Formation in this section is Oligocene (Rupelian-Chatian) to Early Miocene (Aquitanian-Bourdigalian). Manuscript profile
      • Open Access Article

        3 - The geometric analysis of Burkh Anticline, the southeastern of the Zagros fold-and-thrust belt
        Ramzan Ramzani Umali Naser Hafezi Moghaddas Ahmad Nohegar Abdolvahab Afroogh
        Burkh anticline with the WNW-ESE trending is located in southeastern part of the Zagros fold-and-thrust belt and 40 km to the north of Bastak in the Fars zone. In this paper, based on the field data, satellite images and construction of the seven structural cross sectio More
        Burkh anticline with the WNW-ESE trending is located in southeastern part of the Zagros fold-and-thrust belt and 40 km to the north of Bastak in the Fars zone. In this paper, based on the field data, satellite images and construction of the seven structural cross sections, structural geometry of the Burkh anticline is presented. Presence of the Precambrian- Cambrian of the Hormoz salt Formation as a basic detachment layer decouple the folded sedimentary cover from basement. Structural data show that the Burkh anticline is a detachment, buckle, asymmetrical and disharmonic fold. For describing tightness geometry of the fold, the term “open” is suggested. Field study and structural cross sections show that the Dashtak Formation as a middle detachment layer is the controlling factor for development of small-scale folding. Based on top of the Dehram Group underground contour map, vertical closure about 1000 m and horizontal closure of 200 km2 were calculated. Manuscript profile
      • Open Access Article

        4 - Geometric and kinetic analysis of Khaneh Sorkh folding in the Lorestan region, Zagros Folded– Thrust Belt
        Khatoon Pirdadi Aziz Rahimi Mohamad Mahdi Farahpour
        This research has been carried out in order to understand geometric and kinetic analysis of the khaneh Sorkh folding and its structural style. Khaneh Sorkh folding is a long and narrow anticline that is formed due to sleep in the Garau Formation which is located in the More
        This research has been carried out in order to understand geometric and kinetic analysis of the khaneh Sorkh folding and its structural style. Khaneh Sorkh folding is a long and narrow anticline that is formed due to sleep in the Garau Formation which is located in the Lorestan region. The Garau Fomation is the intermediate detachment layer in the Lorestan. In order to carry out geometric analysis, three structural cross sections were drawn perpendicular to the axial surface trace on this anticline. Thus, based on the analysis of the geometry of cross sections and comparing parameters with variety of models, it could be suggested that the Khaneh Sorkh Anticline is a detachment fold in the thrust fault-related folds. Finally,geometry of faulted detachment fold and analysed kinetic evolution is valid for Khaneh Sorkh Anticline based on the proposed model. Manuscript profile
      • Open Access Article

        5 - The effect of the Gachsaran mobile formation on folding style and tectonic evolution of the Rag-e- Sefid anticline in the southern Dezful Embayment
        Mehdi Yosefi Seyd Morteza Moussavi Mohammad Mahdi Khatib
        Plastic behavior and significant thickness of the Gachsaran incompetence formation on top of middle carbonate units in the sedimentary sequence of the southern Dezful Embayment led to the emergence of different styles of folding above and below of this formation. So tha More
        Plastic behavior and significant thickness of the Gachsaran incompetence formation on top of middle carbonate units in the sedimentary sequence of the southern Dezful Embayment led to the emergence of different styles of folding above and below of this formation. So that the structures in the upper and lower parts of this formation are completely separated and do not match each other. In the upper anticlines, above the Gachsaran horizon, the calculation of the limbs angle, the main thrust slope and the percentage of forelimb thickening indicate the fault detachment fold style. This style marks the geometry of fold at the early stage of the development of this anticline. Also the seismic profiles below the Gachsaran horizon also show the fault-propagation folding style. In the south Dezful Embayment, folding in the Gachsaran Formation occurs with shorter wavelengths in the form of disharmonic folds. This folding acts as the decoupling surface for the lower folds so that the synclines in this moving horizon directly cover the lower anticlines. The rounded folds in the carbonates in lower anticline are the imposed folds associated with steepened up reverse faults, detached on the basal decollement level and ultimately faulted by progressive deformation. The interpretation of seismic sections in the southern Dezful Embayment shows that lateral migration occurs in the salt units of the GS2 and GS4, and the upper and lower units of the Gachsaran Formation do not play a role in salt migration. Lateral migration in Miocene salts of the Gachsaran Formation is accomplished by the growth of sub-anticline during folding and loading of upper formation at the upper Gachsaran Formation. Manuscript profile
      • Open Access Article

        6 - Geometrical parameter, Anticline, Sarkan, Zagros, Lurestan
        Reza Alipoor امیرحسین‌  صدر farid shahmoradi عارف  شمس‌زاده
        The Sarkan anticline is located in the Lurestan sedimentary-structural zone and in the Zagros fold and thrust belt. Geometry and kinematic of the fold of this zone are controlled by thrust faults and detachment levels. The exposed formations in this anticline are the up More
        The Sarkan anticline is located in the Lurestan sedimentary-structural zone and in the Zagros fold and thrust belt. Geometry and kinematic of the fold of this zone are controlled by thrust faults and detachment levels. The exposed formations in this anticline are the upper Cretaceous and Cenozoic formations. In this research, geometry and deformational style analysis of the anticline and role of the detachment levels on folding style have been investigated using drawing four structural cross-sections, interpretation of the seismic profiles and calculation of geometric parameters. The structure of this anticline is affected by two detachment horizon, which is the flysch Amiran, and shaly Garu formations as the upper and middle detachment levels, respectively. The high thickness of the upper detachment level caused displacement of the surface anticline axis to the SW with respect to the deep anticline axis. The study of geometrical parameters and structural cross-sections of the Sarkan anticline exhibit that this structure is an asymmetric and noncylindrical anticline, and from tightness and aspect ratio view is ranked in the open to gentle and wide category, respectively. Manuscript profile
      • Open Access Article

        7 - Determining the timing of folding of Jarik anticline in the Dezful embayment, based on the geometry of growth strata
        Ahmad لشگری Mahmoud reza Hayhat Mohammad Mahdi Khatib Mahdi Najafi
        Determining the direction of deformation migration in the fold- thrust belts, is one of the basic aspects for understanding the structural evolution of the fold and thrust belts. By studying the timing and mechanism of deformation and compare it with different regions o More
        Determining the direction of deformation migration in the fold- thrust belts, is one of the basic aspects for understanding the structural evolution of the fold and thrust belts. By studying the timing and mechanism of deformation and compare it with different regions of a fold thrust belt, it is possible to gain a better understanding the history of the structural evolution. The timing and development of deformation in the Zagros folded belt is one of the widely studied topics and the general belief is that collision of two plates of central Iran and Arabian began in Miocene, and gradually developed from the northeast to the southwest. According to the present study, the timing of folding of the Jaril anticline in the northern of Dezful embayment is estimated to be end of Middle miocene (Serravalian). The results of the present study indicated that the onset folding of the Jarik anticline in this area coincides with the deposition of the lower Aghajari Formation. Manuscript profile
      • Open Access Article

        8 - Biostratigraphy of the Campanian-Maastrichtian deposits of the Gurpi Formation in Chenar anticline, Lorestan Zone and comparison with adjacent areas
        Iraj Maghfori-Moghaddam ندا  افروزه
        In this research, biostratigraphic studies of the Gurpi Formation were carried out at the Chenareh section (Lorestan Zone). The thickness of Gurpi Formation at the studied section is 140 m and consists of limestobe, marly limestone and marl. The Gurpi Formation conforma More
        In this research, biostratigraphic studies of the Gurpi Formation were carried out at the Chenareh section (Lorestan Zone). The thickness of Gurpi Formation at the studied section is 140 m and consists of limestobe, marly limestone and marl. The Gurpi Formation conformablely (with significant lithological changes) underlies the white limestones of the Ilam Formation and is covered by the sandstone of the Amiran Formation. On the basis of the recognized planktonic foraminifera, 7 biozone were reported as follows: Globotruncanita elevata Partial range Zone (Early Campanian), Globotruncana ventricosa Interval Zone (Middle to Late Campanian), Radotruncana calcarata Total Range Zone (Late Campanian), Globotruncanella havanensis Partial Range Zone (Late Campanian), Globotruncana aegyptiaca Interval Zone (Late Campanian), Gansserina gansseri Interval Zone (Late Campanian-Early Masstrichtian), Contusotruncana contusa Interval Zone (Late Masstrichtian). In the studied section, the Seymareh and Imam Hassan sections are not observed, unlike other sections in the Lorestan basin. The thickness of this formation in Chenareh anticline is much less than other sections in the adjacent areas. Manuscript profile
      • Open Access Article

        9 - Investigating the geometry and mechanism of folding in Sulabder anticline (SW Iran)
        Mehdi Yosefi F. Esfahani Seyd Morteza Moussavi
        Calculating the amount of shortening, the angle between ridges, the slope of the main thrust and the percentage of thinning of the front ridge compared to the back ridge in the middle and northwestern parts of Sulabder anticline shows the folding style related to fault More
        Calculating the amount of shortening, the angle between ridges, the slope of the main thrust and the percentage of thinning of the front ridge compared to the back ridge in the middle and northwestern parts of Sulabder anticline shows the folding style related to fault propagation in these parts. The calculation of these geometrical parameters in the south-eastern part of the Sulabder anticline also shows the faulted detachment folding style. The change of folding class from 1c to 2 and 3, as well as the change of fold style from detachment folds to fault propagation style, are a sign of increased shortening, deformation progress and evolution of folding from the south-eastern part. This represents that in the initial stage the thrust fault system belongs to the middle and north-western parts, which are in the developed stages of the thrust fault system. The interpretation of seismic sections perpendicular to the Sulabder anticline in different sections shows that the Sulabder anticline in a raised wedge form is higher than the adjacent structures due to the action of the thrust faults on the northern and southern edges. In the Solabdar anticline, the performance and mobile behavior of marl-shale units of Pabdeh and Gurpi formations, due to its high thickness and formable rheology as an intermediate separation horizon, create different folding styles at the top and bottom of this unit. It also caused displacement in the axis of the upper and deeper parts of anticlines. Manuscript profile