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    • List of Articles آباد

      • Open Access Article

        1 - Petrography, geochemistry and petrogenesis of Abbas Abad volcanic rocks (East Shahroud) with emphasis on associated alteration and copper mineralization
         Rasa  Alirezaei Ahmad Kazemi Mehrnia لیلا  صالحی
        Abbas Abad ore district lies in a volcanic and volcanosedimentary belt in East Shahroud and hosts eight copper deposits. This belt is part of volcanic arc in north of central Iran. Copper mineralization is dominated by chalcocite with minor bornite, digenite and covelli More
        Abbas Abad ore district lies in a volcanic and volcanosedimentary belt in East Shahroud and hosts eight copper deposits. This belt is part of volcanic arc in north of central Iran. Copper mineralization is dominated by chalcocite with minor bornite, digenite and covellite. Mineralization occurs as disseminated, veinlet, and stock works. Four alterations (silicification, carbonatization, epidotization and chloritization) are detectable in the host rocks. Lithologies of the volcanic rocks are trachyandesite, trachyandesit basalt and trachybasalte and they have high potassium calc-alkaline to shoshonitic nature. Fractional crystallization and crustal contamination processes are involved in magma evolution. Plagioclase and pyroxene are main minerals and the most important texture (porphyric and glomeroporphyritic) has been observed in this rocks. Zoning, sieve textures and re-absorption in plagioclases, and sieve textures, the effects of corrosion on the margins of pyroxene, and roundness of mineral implies the existence of non-equilibrium conditions during solidification of magma. LREE and LILE enrichment and depletion of HFSE with negative anomalies of Nb, Ti and Ta elements in studied samples show the alkaline nature associated with arc (active continental margin). Ratio of Ba/La and Th/Ta in rocks confirm subducting continental arc for tectonic environment of this rocks. Manuscript profile
      • Open Access Article

        2 - Geochemical and Tectonomagmatic analysis of dibasic dikes and basaltic lavas in the Noorabad ophiolite (North-West Lorestan)
        Ahmad Ahmadi Khalaji mehrdad kiani Zahra Kamali Hadi Shafaei Moghadam asadollah kordnaeij
        The Noorabad ophiolite is a part of Eastern Mediterranean-Zagros-Oman Tethyan ophiolites, cropping out in south-southwest of the Main Zagros Thrust fault. In this sequence of the ophiolite rocks, diabase dikes and basaltic lavas are widespread. The chemical composition More
        The Noorabad ophiolite is a part of Eastern Mediterranean-Zagros-Oman Tethyan ophiolites, cropping out in south-southwest of the Main Zagros Thrust fault. In this sequence of the ophiolite rocks, diabase dikes and basaltic lavas are widespread. The chemical composition of these rocks comprise sub-alkaline basalts, andesitic basalt and andesite. According to normalized REE diagrams to the chondrite and trace elements normalized to the primitive mantle, these rocks show calc-alkaline series, the enrichment of LREE and LILE and depletion of HFSE elements. The characteristics of these ophiolites are similar to other exposed Tethyan ophiolites along Bitlis-Zagros suture zone, and their formation is associated with supra-subduction zones. Manuscript profile
      • Open Access Article

        3 - Mineralogy, geochemistry and genesis of the Shirinabad clay-bauxite deposit, south-east of Gorgan
          Zahra Moridi
        The Shirinabad clay-bauxite deposit with more than 1 km long and about 8 m in thickness is located in 60 km south-east of Gorgan. The Shirinabad deposit has been developed as a stratiform horizon along the contact zone of Triassic dolomitic limestones and Jurassic sh More
        The Shirinabad clay-bauxite deposit with more than 1 km long and about 8 m in thickness is located in 60 km south-east of Gorgan. The Shirinabad deposit has been developed as a stratiform horizon along the contact zone of Triassic dolomitic limestones and Jurassic shales and sandstones. The basal contact zone of the horizon is mainly undulatory, whereas the upper contact zone is concordant with the hanging-wall shales and sandstones. The rocks within the horizon show pelitomorphic, microgranular, oolitic and pisolitic textures. Textural analysis indicates both allochthonous and autochtonous origins for the Shirinabad deposit. Based on textural and mineralogical evidences the deposit can be divided into four distinct units. Kaolinite, anatase, routile, bohemite, hematite, goethite and berthierine are the principal constituents. From geochemical data, it is concluded that the Shirinabad deposit probably originated from basaltic volcanic rocks. Combination of mineralogical and geochemical data shows that the Shirinabad deposit formed in two stages. First, bauxite materials and clay minerals were developed as authigenic bauxitization processes of alkaline basaltic parent rock. Then, these materials were transported to karst depressions and formed the Shirinabad clay-bauxite deposit. Manuscript profile
      • Open Access Article

        4 - Analysis of structural relation between Hatamabad Syncline and Dasht-e-Bayaz active fault, North of Qayen - East of Iran.
        Morteza gholchin Morteza Elahpour Mahmoureza Heyhat Mohammahdi Khatib
        Hatamabad syncline is located 40 km north of Qayen and with an area of more than 190 km2. In this study, the geometric - kinematic analysis of this syncline was assessed to understand the genetic relation between this structure and Dasht-e-Bayaz active fault. Hatamabad More
        Hatamabad syncline is located 40 km north of Qayen and with an area of more than 190 km2. In this study, the geometric - kinematic analysis of this syncline was assessed to understand the genetic relation between this structure and Dasht-e-Bayaz active fault. Hatamabad syncline is situated in Dasht-e-Bayaz fault segmentations gap and its S shape is the result of a sinisteral strike slip movement, raised a lot of questions about the effect of Dasht-e-Bayaz sinisteral fault. Geometric analysis of structural cross sections, determine maximum strain trend 221 or 41 degrees for the Hatamabad syncline. This shows good correlation with stress trend of Dasht-e-Bayaz fault. In addition mechanism of Mohammad Abad -e- Alam fault along with its stress trend 217 or 37 degrees that is obtained by right dihedral method, proves S- shape of Hatamabad syncline. Finally the Hatamabad syncline was deformed due to its location in a sinisteral transpression zone between Dasht-e-Bayaz sinisteral fault with a reverse parameter and Mohammad Abad -e- Alam reverse fault with sinisteral strike slip component. Manuscript profile
      • Open Access Article

        5 - Finite strain analysis of deformed rocks from Ghasem Abad area, Northwest of Lut block
        Farid Rahimi Dehgolan Mohammad Reza Sheikholeslami Jafar Taheri Mohamad Reaz Ghasemi
        Deformed rocks of the Ghasem Abad area are situated in the north-eastern part of the Kashmar-Kerman structural zone in the north-western part of the Lut block. In this study, the finite strain analysis was considered based on microstructural analysis of the different ty More
        Deformed rocks of the Ghasem Abad area are situated in the north-eastern part of the Kashmar-Kerman structural zone in the north-western part of the Lut block. In this study, the finite strain analysis was considered based on microstructural analysis of the different types of deformed rocks. The Fry method was used to determine 2D analysis of strain ellipsoid and the results were subjected to 3D strain analysis using Flinn diagram. The mean value of ellipticity (K) is about 1.91 located in the constriction field of the Flinn diagram showing strain intensity (D) of about 0.54. The intensity of the strain is increased so that the maximum intensities are distributed along strike slip faults of the area. The constriction and flattening ellipticity of the strain are remarked respectively from the northeast-southwest parts and middle part of the study area. The major axis of the strain ellipsoids in xy plane are sub-parallel to the NE-SW strike slip faults and were stretched by approaching to the main faults. Manuscript profile
      • Open Access Article

        6 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
                 
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        7 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
          Afshin  Zohdi Hossein Kouhestani    
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        8 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
         
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        9 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
        Mahsa Noori
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        10 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
         
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        11 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
          Afshin  Zohdi Hossin Kohestani Ghsem Nabatian Mir Ali Asghar Mokhtari
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        12 - Study of original carbonate mineralogy of the Qom Formation using petrography and geochemical evidence in celestite ore section, Madabad, south of Zanjan
          Afshin  Zohdi Hossein Kohestani Ghasem Nabatian Mirali Mokhtari
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper More
        The Qom Formation is the only hydrocarbon reservoir in the central Iran sedimentary basin. In most parts of the central Iran, the Qom Formation conformably overlies the Lower Red Formation with an erosional discontinuity and is in turn conformably overlain by the Upper Red Formation. In the Madabad celestite deposit (south of Zanjan), the Qom Formation is composed of 190 m of medium to thick-bedded and massive limestone, marly limestone and marl. Five main microfacies are identified in the limestone units of the Qom Formation in the Madabad area. These microfacies probably were deposited on a shelf carbonate platform. Petrographic studies suggest original calcite mineralogy for limestone units of the Qom Formation in the Madabad area. Geochemical studies (Ca, Mg, Na, Sr, Mn and Fe) also represent the original calcite mineralogy in a closed diagenetic system with low dissolution rates. These evidence show significant role of fractures rather than diagenetic processes such as dissolution for increasing the reservoir quality of the Qom Formation for the oil and gas fields (such as Serajeh and Alborz) of central Iran. Manuscript profile
      • Open Access Article

        13 - Formation of calamine in Ahmadabad Zn (Pb) Non-sulfide deposit (Northeast of Bafq)
        Sara Amani Lari Iraj Rassa Ali Amiri
        Ahmadabad calamine deposit is located in Posht-e Badam block, 80 km of northeast of Bafgh. The dolomitic unit of Shotori Formation is Middle Triassic age and is ore deposit host rock. Primary non-sulfide mineralization belongs to the Upper Triassic to Jurassic and inclu More
        Ahmadabad calamine deposit is located in Posht-e Badam block, 80 km of northeast of Bafgh. The dolomitic unit of Shotori Formation is Middle Triassic age and is ore deposit host rock. Primary non-sulfide mineralization belongs to the Upper Triassic to Jurassic and includes galena, sphalerite and pyrite since being affected by subsequent tectonic phases- are crushed, uplifted, weathered and oxidized and produced non-sulfide minerals. Calamine, Cerussite, wulfenite, iron oxide and hydroxide are the most abundant non-sulfide minerals in the region. Mineralogical and field observations revealed that calamine is formed in two ways, i.e. direct replacement and wall- rock replacement. Direct replacement calamine is formed at the site of primary sulfide mineralization and has more mineralogical variability compared with the wall-rock replacement type. Mineralogical characteristics of the minerals revealed, metal-rich solutions perform non-sulfur mineralization in the unsaturated zone, within the porous host rock and the type of mineral is affected by changes in carbon dioxide pressure and ambient pH. The average values of the oxygen stable isotope data of hydrozincite is 25.5‰; therefore, the average temperature for the formation of this mineral is 29 ºC. Chemical analysis showed that the direct replacement calamine has more lead and the other type has more zinc, and due to the high concentration of arsenic and cadmium in the mineral composition of the area, more attention should be paid to the environmental issues. Manuscript profile
      • Open Access Article

        14 - Determinig the relationship between copper mineralization and structures in Ali abad- Darreh Zereshk area, using subsurface geotechnical and geochemical data
        Mehdi Ramazani Hojjat Ollah Safari Gholam Hossein  Shamanian Homayoun  Safaei
        20.1001.1.17357128.1399.14.55.6.7
        In order to find the relationship between porphyry copper depositions with faulting systems, the Aliabad porphyry and Darre Zereshk Porphyry- Skarn ores were selected as a case studies in Uramia- Dokhtar Magmatic Belt,. In this research, discovering this correlation pro More
        In order to find the relationship between porphyry copper depositions with faulting systems, the Aliabad porphyry and Darre Zereshk Porphyry- Skarn ores were selected as a case studies in Uramia- Dokhtar Magmatic Belt,. In this research, discovering this correlation procedure was performed by using surface and subsurface data (i.e. drilling data as geotechnical and Cu-percentage data) from Aliabad and Darre Zereshk mine districts. The results show that RQD criteria extracted from fault zones have a good correlation with surface faults which are identified by field investigations and Remote Sensing techniques. Also, the copper enriched was observed along fault zones and therefore, the relationship between porphyry copper deposits and fault zones is approved. Manuscript profile
      • Open Access Article

        15 - Sudden drowning of the Late Cretaceous carbonate platform in central Zagros basin: a case study from the shaley Laffan Member in one of the Oil Fields of Abadan Plain, SW Iran
        maryam kianifard علی حسین  جلیلیان nasser arzani
        20.1001.1.17357128.1399.14.56.1.4
        Rapid sea-level rise and drowning of carbonate platforms is one of the important geological events in the Late Cretaceous and after the Turonian global unconformity. This transgression in central and western Zagros Basin is represented as shaley sediments of the Laffan More
        Rapid sea-level rise and drowning of carbonate platforms is one of the important geological events in the Late Cretaceous and after the Turonian global unconformity. This transgression in central and western Zagros Basin is represented as shaley sediments of the Laffan Member, which were deposited over the Sarvak Formation. The stratigraphic position and the occurrence of the Charophytes-Ostracods biozone indicate the late Cretaceous, Coniacian age for the Laffan Member, which is stratigraphically equivalent to the Surgah Formation in Lurestan area in the west of Iran. The Laffan Member is mainly shaley in lithology with intercalations of thin-bedded argillaceous limestones and is the caprock over the reservoir of the Sarvak Formation in some oil fields in SW Zagros. Microfacies, sedimentary environments, biostratigraphy and sequence stratigraphy of the Laffan Member in two wells of Azadegan Oil Field located in Abadan Plain were investigated. Petrographic data revealed the presence of a shaley facies and two carbonate microfacies including charophitic mudstone-wackestone to bioclastic planktonic foraminiferal wackestone. These microfacies were deposited in transitional-brackish to deep marine environments. Marine transgression over the eroded palaeotopography of the Cenomanian-Toronian carbonates resulted in estuaries as channels and transitional environments. In these estuaries, mixture of the fresh and marine waters resulted in deposition of the lower parts of the Laffan Member and graded upward into the marine deposits of the upper parts of this Member.The sudden change of shallow-transitional facies to deep marine sediments in the Laffan Member indicates drowning of the carbonate platform of central Zagros Basin in Coniacian. The evidence like erosional base, deepening-upward sequences, frequency of mudstone facies (shale) and continuity with marine carbonates confirm this conclusion. Investigation of vertical changes of the microfacies with gama-ray well log data indicate the Laffan Member is part of a sequence as lowstand deposits (LST), transgressive deposits (TST) which grade upwards into maximum flooding surface (MFS) and high-stand deposits (HST) which comprise a third-order sequence. This sequence begins with an erosional unconformity and follows up with the formation of the estuary and deep sea sediments. The latter package is covered with the carbonate sediments of the lower part of the Ilam Formation (Santonian) which represents carbonate platform deposits of high-stand system track (HST). Manuscript profile
      • Open Access Article

        16 - Physiochemical characteristics of oOre-bearing fluids for celestite occurrence in the Zagros fold-thrust belt: using microthermometry studies
        رضوانه  حمیدی Hojjat Ollah Safari مهاسا  روستایی
        20.1001.1.17357128.1400.15.60.3.1
        Oilgocene-Miocene celestite occurrences are observed across the carbonate-evaporite formations of Asmari and Gachsaran in the Zagros fold - thrust belt. The aim of this research is the study of fluid inclusions in our celestite deposits (Tortab, Tarak, Likak and Babamoh More
        Oilgocene-Miocene celestite occurrences are observed across the carbonate-evaporite formations of Asmari and Gachsaran in the Zagros fold - thrust belt. The aim of this research is the study of fluid inclusions in our celestite deposits (Tortab, Tarak, Likak and Babamohamad) to reveal the nature of ore-forming fluids. Abundant structures including: geodic and vein-like structures as open-space filling along with replacement textures like mosaic and vein-like in a carbonate matrix are present. Moreover, celestite, calcite, gypsum and anhydrite are observed as the major minerals in this deposits. Based on petrographic studies, 5 groups of fluid inclusions were recognised, which are categorized as: Liquid mono phase (L), vapour mono phase (V), liquid-rich two phase (LV), vapor-rich two phase (VL) and multi-phase fluids (LVS). The results obtained from the study of microthermometry data show 134.3 to 291.8°C as homogenisation temperatures and salinities of 2.5-18.17 wt%, NaCl equ, all are involved in forming celestite. Based on the results of microthermometry data, it can be deduced that formation mechanism of celestite is resulted from reaction between fluid and rocks of the area. Moreover, tectonic activities such as uplift and diagenesis of beds along with dissolution of minerals have caused release of strontium in the fluids responsible for ore-forming. This has generally undertaken by two fluids of meteoric and brine origins over different stages of ore-formation, replacing anhydrite with strontium at high temperatures during late- diagenetic and epigenetic processes. Manuscript profile
      • Open Access Article

        17 - Geology, mineralization and genesis of the Madabad celestite deposit, south Zanjan
        مهسا  نوری Hossein Kouhestani قاسم  نباتیان میرعلی اصغر  مختاری افشین  زهدی
        20.1001.1.17357128.1400.15.60.4.2
        Rock units in the Madabad celestite deposit are composed of medium to thick-bedded and massive limestone interlayered with marly limestone and marl units of the Qom Formation (lower Miocene). Mineralization occurs as lens-shaped orebody, hosted by limestone units of mem More
        Rock units in the Madabad celestite deposit are composed of medium to thick-bedded and massive limestone interlayered with marly limestone and marl units of the Qom Formation (lower Miocene). Mineralization occurs as lens-shaped orebody, hosted by limestone units of member of the Qom Formation usually crosscutting bedding of the host rocks. Three stages of mineralization occurred in the Madabad deposit. The first stage is characterized by calcite formation during syn-depositional to syn-diagenesis processes. The second stage is related to hydrothermal processes that are distinguished by formation of fine-grained and sugary crystals of massive stage-1 celestite, vein-veinlets of coarse-grained stage-2 celestite along with minor strontianite and barite, coarse-grained euhedral crystals of stage-3 celestite with vug infilling texture, and finally late-stage quartz and calcite vein-veinlets. Stage three includes supergene processes. Hydrothermal alteration includes dolomitization, calcitization and silicification. Celestite along with minor strontianite and barite are ore minerals, and calcite, dolomite, quartz and iron oxides-hydroxides are gangue minerals at Madabad. The ore minerals show vein-veinlets, vug infilling, brecciated and cataclastic textures. Microthermometric measurements of two-phase liquid-rich fluid inclusions hosted in celestite II indicate that salinities values range from 6 to 18 wt.% NaCl equiv. (avg. 10.6 wt.% NaCl equiv.). These inclusions have homogenization temperatures range from 248 to 365 °C, with an average of 278 °C. These data indicate a minimum trapping depth of 510 m for the Madabad deposit. Sr was originated from evaporate units within the marly parts of the Qom Formation and volcanic units of the Karaj Formation. Characteristics of the Madabad deposit are similar to epigenetic replacement celestite deposits. Manuscript profile
      • Open Access Article

        18 - The application of Normalized Cumulative Gamma Deviation Log (NCGDL) in sequence stratigraphic analysis and correlation, a case study from the Sarvak Formation, Abadan Plain, SW, Iran
        A. Asaadi A. Imandoust J.  Honarmand ایرج عبدالهی فرد O.R. Salmian
        20.1001.1.17357128.1401.16.63.2.3
        Identification of key sequence stratigraphic surfaces is an essential task in geological evaluation of hydrocarbon reservoirs. The Sarvak Formation with Late Albian-Early Turonian age constitute the important reservoir unit in the Abadan Plain region, SW Iran. This stud More
        Identification of key sequence stratigraphic surfaces is an essential task in geological evaluation of hydrocarbon reservoirs. The Sarvak Formation with Late Albian-Early Turonian age constitute the important reservoir unit in the Abadan Plain region, SW Iran. This study investigates the application of Normalized Cumulative Gamma Deviation Log (NCGDC) to discriminate and correlate key sequence stratigraphic surfaces in six wells in a giant oil field in the Abadan Plain. To achieve this goal, identified key stratigraphic surfaces from core and thin sections were compared with interpretation of NCGDC method. From sequence stratigraphic point of view and based on the results from geological studies, the Sarvak Formation has been sub-divided into four third-order sequences which are described and interpreted. Two main disconformity surfaces, considered as sequence boundaries, are characterized by features of karstification, dissolution-collapse brecciation, and development of paleosol horizons. Generally, positive surfaces correspond to maximum flooding surfaces and negative surfaces occur at sequence boundary. Comparison of the results shows that, the identified sequence by NCGDC method can be effectively used for discrimination and correlation of sequences in different carbonate and siliciclastic reservoirs in the field scale. Manuscript profile
      • Open Access Article

        19 - Mineralogy geochemistry and genesis of Kehdolan copper deposit Bostanabad east Azarbaijan
        Alireza Yousefi Sh. Niroomand Abdorrahman Rajabi mohammad amini
        Study area is located in Eastern Azerbaijan province, 27 km far from east Bostanabad, and the north of Qarehchaman geological map. According to field tracking and surveys, host rock of mineralization is a Subvolcanic rocks of Oligocene period. Based on microscopic studi More
        Study area is located in Eastern Azerbaijan province, 27 km far from east Bostanabad, and the north of Qarehchaman geological map. According to field tracking and surveys, host rock of mineralization is a Subvolcanic rocks of Oligocene period. Based on microscopic studies, the most important of supergene part, containing primary oxide minerals (Magnetite), secondary oxide minerals (Malachite, Hematite and Goethite) and also sulphide minerals such as Chalcocite, Covellite, Pyrite and insignificance Chalcopyrite. Among the most important alterations, argillic, silicification, carbonization and propylithic can be noted. Geochemical studies shows that host rock of mineralization with Monzosyenitic composition, placed in high chalc-alkaline to shoshonitic and metaluminous range. Formation environment of host rock of mineralization is a volcanic arc of subduction zone that confirmed by normalized rare earth elements diagrams. Manuscript profile

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