List of Articles سولفات

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  1 - Factors controlling different types of anhydrite textures and their relation to reservoir quality in the Asmari reservoir in Ahvaz oil field
  نسترن  آزادبخت
  Various diagenetic processes have affected reservoir quality of the Asmari Formation in Ahvaz Oil Field in wells No. 19 with a thickness of 357 meters. It is composed of limestone dolomite, dolomitic limestone, sandy dolomitic limestone, sandstone, siltstone and sha More

  Various diagenetic processes have affected reservoir quality of the Asmari Formation in Ahvaz Oil Field in wells No. 19 with a thickness of 357 meters. It is composed of limestone dolomite, dolomitic limestone, sandy dolomitic limestone, sandstone, siltstone and shale. Study of 1100 thin sections from available cores at this well as well as the well’s numeral data, porosity and permeability of cores, indicates that the most important diagenetic processes is anhydritic cement with different types of textures. It appears as poikilotopic, porefilling and pervasive, nodular, fracture filling, sparce crystals, and evaporite veins. During different steps of diagenesis, these texture show replacement and pore filling porosity that have affected different facies to some degrees. Results of this study show that anhydrite cement occurs mainly in dolomitic and sandstone facies and to some extent, affected the reservoir quality. This is due to the effect of sulphate rich brines during dolomitization. Where the presence of anhydrite cements in limestone facies is sparse and rare, it has little effect on reservoir quality. However, pore filling and pervasive anhydrite texture filling all pore-space in dolograinstone and dolopackstone grain-supported facies during shallow burial intensively reduced reservoir quality. Dissolution of cements at later stage of diagenetic processes (creating secondary porosity) improved reservoir quality. In addition, solution of texture poikilotopic anhydrite in sandstone facies and repercipitated as patchy anhydrite with poikilotopic texture, results in reduction of porosity but it doesn’t make any changes in throat pores. Hence patchy anhydrite with poikilotopic texture that reduces porosity converts the sample from Lucias class 2 to class 1. Manuscript profile
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  2 - Sulfur source tracing of sulfide and sulfate minerals in fluorite Mines of the Elika Formation (East of Mazandaran Province): Implications of sulfur isotope
   
  Sulfur source tracing based on of sulfide (galena and pyrite) and sulfate (barite) mineralization in fluorite deposits of Elika Formation (East of Mazandaran Province) is studied. In present research. δ34S values vary between -1.82 – +12.49 ‰, +13.22 – +25.83 ‰ and +22. More

  Sulfur source tracing based on of sulfide (galena and pyrite) and sulfate (barite) mineralization in fluorite deposits of Elika Formation (East of Mazandaran Province) is studied. In present research. δ34S values vary between -1.82 – +12.49 ‰, +13.22 – +25.83 ‰ and +22.69 – +32.91 ‰ for galena, pyrite and barite, respectively. Regionally, although wide range of δ34S in sulfides is interpreted as isotopic heterogeneity of source and/or processes of reduced sulfur supply for sulfide mineralization in the studied area, but each deposit has narrow range of δ34S. Compared to sulfides, barites show isotopic homogeneity in heavier δ34S which are corresponding to evaporates from coexisted sea water (Middle-Upper Triassic; Paland Formation). Based on stratigraphic and mineralogical data of host rocks, co-existing evaporates of Triassic sea water and also diagenetic primary sulfates in matrix of host rocks (anhydrite, gypsum, barite) are introduced as the most probable sources of sulfur for sulfide mineralization in Shesh Rodbar and Era deposits. In contrast, contribution of organic matter and/or diagenetic primary pyrites had main role in generation of light δ34S values in Pachi Miana and Kamarposht deposits. Thermo-chemical reduction of digenetic primary sulfates and thermal decomposition of diagenetic primary sulfides as well as sulfur bonds in organic matter-bearing laminaes in the host rock are introduced as main processes for reduced sulfur supply in sulfide mineralization. Manuscript profile
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  3 - Sulfur source tracing of sulfide and sulfate minerals in fluorite Mines of the Elika Formation (East of Mazandaran Province): Implications of sulfur isotope
   Zabihitabar bahman shafiei  Mirnejad
  Sulfur source tracing based on of sulfide (galena and pyrite) and sulfate (barite) mineralization in fluorite deposits of Elika Formation (East of Mazandaran Province) is studied. In present research. δ34S values vary between -1.82 – +12.49 ‰, +13.22 – +25.83 ‰ and +22. More

  Sulfur source tracing based on of sulfide (galena and pyrite) and sulfate (barite) mineralization in fluorite deposits of Elika Formation (East of Mazandaran Province) is studied. In present research. δ34S values vary between -1.82 – +12.49 ‰, +13.22 – +25.83 ‰ and +22.69 – +32.91 ‰ for galena, pyrite and barite, respectively. Regionally, although wide range of δ34S in sulfides is interpreted as isotopic heterogeneity of source and/or processes of reduced sulfur supply for sulfide mineralization in the studied area, but each deposit has narrow range of δ34S. Compared to sulfides, barites show isotopic homogeneity in heavier δ34S which are corresponding to evaporates from coexisted sea water (Middle-Upper Triassic; Paland Formation). Based on stratigraphic and mineralogical data of host rocks, co-existing evaporates of Triassic sea water and also diagenetic primary sulfates in matrix of host rocks (anhydrite, gypsum, barite) are introduced as the most probable sources of sulfur for sulfide mineralization in Shesh Rodbar and Era deposits. In contrast, contribution of organic matter and/or diagenetic primary pyrites had main role in generation of light δ34S values in Pachi Miana and Kamarposht deposits. Thermo-chemical reduction of digenetic primary sulfates and thermal decomposition of diagenetic primary sulfides as well as sulfur bonds in organic matter-bearing laminaes in the host rock are introduced as main processes for reduced sulfur supply in sulfide mineralization. Manuscript profile
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  4 - Local care of the hooves (Footbath application)
  Khosro Safari Nikroo mohammad ali sadeghi
  Foothbathes are one of the most efficient methods of control and prevention of foot lamenesses specially hoof infectious diseases in dairy herd facilities. In this article different types of foothbathes, design and structure, solutions and renewal rates have been review More

  Foothbathes are one of the most efficient methods of control and prevention of foot lamenesses specially hoof infectious diseases in dairy herd facilities. In this article different types of foothbathes, design and structure, solutions and renewal rates have been reviewed. Copper sulphate and formalin were the most frequently used solution and dimention of 81 cm of width, 3-3.7 m length and depth of 11 cm were introduced as standard dimentions. On the other hand due to environmental and human concerns these solution should be evacuated approperiatly. Also the most appropriate range of bath usage was between 1-4 times a day and 1-7 times a week and in each bath, between 100-300 cows can pass without significant reduction of chemical solution concentration. It should be noted that merely observing these instructions will not reduce digital diseases, and other health and disease control programs should be considered in the herd. Manuscript profile