List of Articles
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Open Access Article
1 - Paleostress analysis in Bozqush Mountains, northwest Iran
احد نوری Parisa Amini Sharifi MoayyedKnowledge of the local stress field in a region is important in the structural and affecting factors on structural kinematics studies. Therefore, in this paper after describing the basic theoretical principles of stress inversion method from slickensides, it was used MoreKnowledge of the local stress field in a region is important in the structural and affecting factors on structural kinematics studies. Therefore, in this paper after describing the basic theoretical principles of stress inversion method from slickensides, it was used field measured heterogeneous fault –slips as raw data to determine the average state of the principal stress axes in order to analyze the regional geodynamic situation of this area. The results of the reduced stress tensor from fault-slip measured data, show 21/156، 64/012 and 14/251 states for σ1، σ2 and σ3 axes respectively. The results of analysis of these data show substantial agreement between the determined principal stress axes and recent tectonic research in this region. Manuscript profile -
Open Access Article
2 - The Evidence of multiple origin for calcareous springs in the Abe Ask region (Southeast of Damavand volcano) using isotopic data, water geochemistry and Remote Sensing studies.
Somayeh Rahmani Safyeh Omidian nasibeh zareiThere are several calcareous springs and travertine deposits on Southeast flanks of Damavand volcano in Abe Ask area (85 km northeast of Tehran, Central Alborz zone). In this study, based on carbon and oxygen isotopic signatures on travertine deposits, the source of s MoreThere are several calcareous springs and travertine deposits on Southeast flanks of Damavand volcano in Abe Ask area (85 km northeast of Tehran, Central Alborz zone). In this study, based on carbon and oxygen isotopic signatures on travertine deposits, the source of spring water was evaluated. Isotopic signatures show that δ13C and δ18O values enrichment in travertines gradually away from the springs. According to the primitive value of δ13C(CO2), travertine was deposited from a hydrothermal metasomatic fluids. Concerning to the linear trend between the δ13C– δ18O of travertine, the main hydrothermal metasomatic fluid (that was responsible for travertine deposition) was probably mixed with fluids of different origins. According to the isotopic analysis, the mantle-sea origin is suggested for the dissolved CO2 of water springs, in addition, the results of water geochemical data also confirmed a deep source for the Abe Ask water springs. According to the remote sensing investigation on satellite images, the distribution of travertine and faults lineation and drainage pattern, suggest the strong effect of surface and tectonic processes, in controlling the placing and distribution of the travertine. Finally, geochemical data on water springs and isotope investigations on travertine reveal both surface and deep-water source contribution in formation of the Abe Ask water springs. Manuscript profile -
Open Access Article
3 - Microfacies, Sedimentary Environment and Sequence Stratigraphy of the Qom Formation, Deh Namak, Northwest of Garmsar
Jahanbakhsh Daneshian Asadi Mehmandosti yousef ramezaniDeh Namak section is exposed along the most northern point of the Qom Formation, where the Central Iran zone and Alborz zone come together. The study of microfacies, sedimentary environments and sequence stratigraphic features of the Qom Formation in this area can h MoreDeh Namak section is exposed along the most northern point of the Qom Formation, where the Central Iran zone and Alborz zone come together. The study of microfacies, sedimentary environments and sequence stratigraphic features of the Qom Formation in this area can help to understand the situation of the Qom sedimentary basin in the northern part, bordering the Alborz zone. 166 samples of the Qom Formation in Deh Namak section in the northwest of Garmsar are investigated. Microfacies analysis of these sedimentary rocks indicates that according to sedimentary environment they consist of nine microfacies belonging to four facies belts including tidal flat, agoon, shoal/reef sediments and slope of platform. Due to the absence of the gravitational and turbidity sediments and abundance of reef/shoal sediments, a rimmed carbonate shelf depositional environment is suggested in which more sediments were precipitated in shallow water. In this model, deep facies of the basin did not spread and the deepest facies belong to the slope. Also, sequence stratigraphic studies show that the Deh Namak section is composed of four sedimentary sequences of third- order, two types II and one type I sequence boundaries were recognized in this formation. Manuscript profile -
Open Access Article
4 - Geochemistry of pegmatitic and vein tourmalines and their formation mechanism in the Mashhad leucogranites
Farhad Zal Zahra Tahmasbi Ahmadi NoubariThe studied area is located in the Binalud Zone and comprises Mashhad leucogranites (g2) that include pegmatites and tourmaline veins. According to studies of the Mashhad leucogranites, these granites are peraluminous, highly differentiated and resulted from meltin MoreThe studied area is located in the Binalud Zone and comprises Mashhad leucogranites (g2) that include pegmatites and tourmaline veins. According to studies of the Mashhad leucogranites, these granites are peraluminous, highly differentiated and resulted from melting metapelites. In these granites, tourmaline can be seen in various forms of dendritic, nodules, vein and pegmatitic forms. For geochemical studies of vein and pegmatitic tourmalines, it was used microprobe analysis (EPMA), XRF and ICP- MS. Based on these analyses, pegmatitic tourmalines include schorl and vein tourmalines which are magnesium-rich- schorl and both are classified in the range of alkaline tourmalines. They have oscillatory chemical zoning and bluish green to brown pleochroism that is probably due to changes in concentration of Ti, Ca, and Fe. In the studied tourmalines, major substitutions took place including Na+(Fe+Mg)= X-Vacancy+Al and Na+(Fe+Mg)OH=Na+Al(O). Both types of tourmalines are resulted from magma differentiation with this difference that pegmatitic tourmalines show magmatic system characteristics but vein tourmalines have magmatic-hydrothermal system characteristics. These properties are related to the pegmatitic development stages and fluids obtained during their evolution. Manuscript profile -
Open Access Article
5 - Microfacies and sedimentary environment of the Shahbazan Formation in well no. 3 of the Qhaleh Nar oil field
Hossein Ghanbarlo RabieiVaziri هوشنگ خیری maryam ahmaditaheri ali shahdadiIn this study, microfacies and depositional environment of the Shahbazan Fromation are investigated in well no. 3 of the Qhaleh Nar oil field (SW Lurestan). The thickness of the Shahbazan Formation in the studied well is 228 meters. This formation consists mainly of lim MoreIn this study, microfacies and depositional environment of the Shahbazan Fromation are investigated in well no. 3 of the Qhaleh Nar oil field (SW Lurestan). The thickness of the Shahbazan Formation in the studied well is 228 meters. This formation consists mainly of limestone and dolomite. The lower boundary of the Shahbazan Formation with the Pabdeh Formation is conformable and its upper boundary with Asmari Formation is marked by an unconformity. The Shahbazan Formation in the studied well is considered middle Eocene (early Lutetian) to late Eocene (Priabonian) in age. Fourteen microfacies types were distinguished based on their depositional texture, petrographic analysis and fauna in the studied well. The sediments were deposited in open marine, bar and lagoon subenvironments. Based on distribution of microfacies, it seems that the lower and upper parts of the Shahbazan Formation were deposited in two types of carbonate settings. The lower part was deposited in an open shelf setting, while, a homoclinal ramp were recognized for the upper part. The lower and upper parts of the Shahbazan Formation can be divided into two subenvironments, middle and outer shelves and middle and inner ramps, respectively. The production rate and diffusion coefficient and the tectonic conditions are the effective factors on the evolution of the platform from an open shelf setting to a homoclinal carbonate ramp . Manuscript profile -
Open Access Article
6 - Sedimentology and sedimentary geochemistry of aerosol over Ahvaz metropolis
Ali Hossein JalilanDust storms are dispersion of very fine solid particles in the air that lead to serious socio-environmental and economic problems. They have been widely observed in recent years in the sky of western and southern parts of Iran. The concentrations of dusts have sometim MoreDust storms are dispersion of very fine solid particles in the air that lead to serious socio-environmental and economic problems. They have been widely observed in recent years in the sky of western and southern parts of Iran. The concentrations of dusts have sometimes reached up to a level estimated 66 times more than the acceptable and normal limits. In order to evaluate textural properties, mineralogical and chemical composition of dust samples were collected during dust storms that blew over Ahvaz metropolis in July and August 2014. The results indicated that statistical parameters of the samples were +6.10 phi, 2.17, +0.14 and 0.71 for mean grain size, standard deviation, skewness and kurtosis respectively. The main mineralogical constituents were quartz, feldspar, calcite and gypsum with a minor proportion of pyroxene, goethite, hornblende and biotite. The results also revealed that the shape of sand grains is well-rounded as a result of transportation and abrasion of these grains over a long distance. Moreover, XRD analyses of samples reflected the clay minerals fraction of dusts mainly comprised of kaolinite, polygorskite and chlorite. These types of clay minerals show a dry climate and an alkaline source area. Atomic absorption and X-ray fluorescence analysis showed major elements as Si, Al and Fe with minor elements such as Mg, Na and Ca. These dusts also contained minor and toxic elements such as heavy metals, and estimated enrichment factors showed that Ni, Co, Cd and Zn had high enrichment suggesting anthropogenic origin. Manuscript profile -
Open Access Article
7 - Petrography, depositional environment and Cu mineralization in redbeds, North of Torbat- Heydarieh (Kadkan sedimentary basin)
Copper mineralization in the Kadkan sedimentary basin occurs as stratiform and lenticular shape and it seems to be redbed type sediment-hosted copper deposits. Mineralization is mainly dispersed and confined to the red sandstone- marl units with thick interbeds of Eoc MoreCopper mineralization in the Kadkan sedimentary basin occurs as stratiform and lenticular shape and it seems to be redbed type sediment-hosted copper deposits. Mineralization is mainly dispersed and confined to the red sandstone- marl units with thick interbeds of Eocene-Oligocene conglomerate and includes primary ore minerals: chalcopyrite, pyrite and chalcocite and secondary ore minerals: covellite, malachite and azurite. By considering the obtained results, control of mineralization in these sandstones is in relation with alteration of feldspars, concentration of clays and organic matter. Sandstones are medium to thick in thickness, bright red to dark gray in color and are classified as arkose, lithic arkose and iron bearing fine-grained submature feldspatic litharenite that were deposited in a river-dominated deltaic environment and active margin. The potential of sediment-hosted copper mineralization decreases in the redbeds from east to west (Kadkan) of the region. The results indicate that the copper mineralization in the study area is redbed type sediment-hosted copper. Manuscript profile