Mineral chemistry and geothermobarometry of metabasites of the Majerad igneous-metamorphic complex (SE of Shahrood) (original) (raw)
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Journal of Economic Geology, 2019
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Petrography, alteration and genesis of iron mineralization in Roshtkhar
Journal of Economic Geology, 2017
Introduction Iron mineralization in Roshtkhar is located in 48 Km east of the city of Roshtkhar and south of the Khorasan Razavi province. It is geologically located in the north east of the Lut block and the Khaf-Bardeskan volcano-plutonic belt. The Khaf-Bardeskan belt is an important metallogenic province since it is a host of valuable ore deposits such as the Kuh-e-Zar Au-Spicularite, the Tanourcheh and the Khaf Iron ore deposits (Karimpour and Malekzadeh Shafaroudi, 2007). Iron and Copper mineralization in this belt are known as the hydrothermal, skarn and IOCG types (Karimpour and Malekzadeh Shafaroudi, 2007). IOCG deposits are a new type of magmatic to hydrothermal mineralization in the continental crust (Hitzman et al., 1992). Precambrian marble, Lower Paleozoic schist and metavolcanics are the oldest rocks of the area. The younger units are Oligocene conglomerate, shale and sandstone, Miocene marl and Quaternary deposits. Iron oxides and Cu sulfides are associated with igneo...
Journal of Economic Geology, 2019
Introduction The Chahfiruzeh porphyry copper deposit is located at 35 Km northwest of Shar-e-Babak in Dehaj–Sarduieh part of the Urumieh- Dokhtar magmatic arc (UDMA). The world class porphyry Cu deposits, such as Sarcheshmeh, Meiduk, Sungun and several other Cu-porphyry in the UDMA have been numerously studied, for example: Boomeri, et al., (2009, 2010), and Asadi et al., (2014). The Chahfiruzeh Cu porphyry is divided into two parts of the southern and northern deposits. The southern deposit was studied by Hezarkhani (2006), and Sheikhzadeh et al., (2011). This paper studies the northern part to distinguish mineralized rock units, alteration types, mineralization style, ore mineralogy and geochemical characteristics. Geology Geology of the northern part of the Chahfiruzeh area consists of upper Cretaceous-Eocene andesitic lava, pyroclastic and volcanoclastic rocks that have been intruded by Oligo-Miocene intermediate stocks and dikes (Dimitrijevic, 1973). Neogene rocks in the area a...
Journal of Economic Geology, 2017
Introduction The Qahr-abad fluorite deposit is located in the area of 36°10′ 3′′ N and 46°34′ 21′′E within the Sanandaj-Sirjan district east of the Kurdistan province , Iran and it is located ~57 km southeast of the city of Saqqez (Kholghi Khasraghi, 1999). This deposit is developed as scatter lenses, veins, and veinlets (stockwork structure) within carbonate rocks of Elika formation and controlled by the regional NW–SE trending Zagross thrust nappe system. Fault trends in this area are perpendicular to fault trends in the Zagros zone. The fault dips are nearly vertical and mineralization has occurred in the brecciation fault zone (Talaii, 2010). The rough geological instruction of the deposit has indicated that it is similar to worldwide Epithermal deposits. The mineralization occurs as replacement (type I)/ open-space (type II) vein fillings and bodies within Mesozoic lime stones (mostly Upper Triassic and Lower Jurassic members of the Elika Formation), where they crop out to form...
One of the best indicators of the geological and environmental events in the Quaternary is the alternation of loess-paleosol. In this study, for paleoenvironmental identification of buried paleosols in loess sequences, 14 sections located between 36˚ 49′ 6˝ to 36˚ 49′ 20˝ northern latitude and 54˚ 26′ 45˝ to 54˚ 26′ 52˝ eastern longitude in the southern part of Gorgan (Kharazmi town) were studied. The disturbed soil samples for physico-chemical analysis and clay mineralogy and undisturbed samples for prepration of thin sections were collected. The physicochemical results (calcium carbonate content, particle size distribution, cationexchangable capacity and Feo/Fed) indicated that the soils had experienced several pedogenic periods. The result of mineralogy showed that a high amount of smectite, vermiculite and mixed layer mica-smectite in paleosols compared to loess deposits probably indicates moister regims through interglacial compared to glacial periods. The micromorphological observations revealed many evidences on the occurance of pedogenic processes. One of the most important index of pedogenesis, clay coating and hypocoating around void are presented only in buried paleosols, which is the evidence for moist climate conditions, enough for leaching and translocation of clay. Formation of the studied loess and paleosols, probably took place in glacial and interglacial cycles with different climate condition, respectively.
2012
Recently, sewage sludge as a cheap organic fertilizer and rich in nutrients has received considerable attention in many countries. The aim of this study was to determine the effects of Tabriz petrochemical factory ' s biological sludge on some soil biochemical and chemical indices such as the number of microorganism s, substrate-ind uced respiration, electrical conductivity, hot water-soluble carbohydrates and total nitrogen as well as their temporal variations in a calcareous soil selected from Mohaghegh Ardabili University ' s Research Station. The greenhouse experiment was done as a factorial randomized complete block design with three replicates. The first factor was the rates of applied sludge as 0 (control), 25, 50, 75 and 100 ton/ha of air dry soil and the second factor was the incubation times as 30, 90 and 180 days. Incubation of the treatments was done at 22±4 ◦ C and 0.75 field capacity moisture for 6 months. The results indicated that the all rates of applied slu...
Molecular identification of basidiomycetous yeasts from soils in Iran
2015
چلا داژنراتخم ني : يوجشناد يرتكد يراميب يهايگ يسانش ، هايگ هورگ يكشزپ ، ربت هاگشناد زيربت ،زي (mokhtarnejad@ut.ac.ir) يدهم ولنزرا : رايشناد چراق و يسانش يراميب يهايگ يسانش ، هايگ هورگ يكشزپ ، ربت هاگشناد زيربت ،زي ادسا هل ب يابا يرها : داتسا يراميب يهايگ يسانش ، هايگ هورگ يكشزپ ، ربت هاگشناد زيربت ،زي اتدنب يتكروت : تسا ،يدربراك يژولويبوركيم هورگ رايدا جورپ هاگشناد ي ايلاتيا ،ا
Rostaniha, 2016
Diatoms of Gomishan wetland (Golestan province, N. Iran), one of the most significant habitats in the eastern shore of the Caspian Sea, has been isolated, purified and identified during 2013. Using serial dilution and streaking on F/2 medium, pure, monoalgal and axenic cultures of the isolates were prepared. The isolates were characterized and identified using micro-morphological studies on the prepared permanent slides followed by scanning electron-microscopy. To prove the identification results, the most reliable genomic sequence fragments were investigated using GenBank database. Thus, SSU was amplified and analyzed, phylogenetically. The morphology and sequence data of three isolates were assessed which indicated that, the results of phylogenetic analyses of SSU-based sequences can support the morphological studies data. Finally, the isolates were introduced as Fallacia pygmaea, Halamphora coffeiformis and Navicula veneta.