List of Articles

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  1 - Microfacies and sedimentary environment of the Maastrichtian deposits in Jorbat Stratigraphic section, west of Kopet Dagh
  Yadolah Ezampanah Mahmoud Jalali محمد حسين  آدابي امیرمحمد  جمالي
  To determine microfacies and depositional subenvironments of the Maastrichtian deposits in the western part of the Kopet-Dagh Basin, one stratigraphic section, has been selected and analysed. In this section which is located 9.5 kms N-NW of Jorbat, Maastrichtian deposit More

  To determine microfacies and depositional subenvironments of the Maastrichtian deposits in the western part of the Kopet-Dagh Basin, one stratigraphic section, has been selected and analysed. In this section which is located 9.5 kms N-NW of Jorbat, Maastrichtian deposits are composed of two formations including Kalat (282 m thickness) and Chakhmaghlo (77 m thickness). The Kalat Formation consists of bioclastic and sandy limestone and the Chakhmaghlo Formation is composed of shale, marl, limestone and argillaceous limestone. Based on field observations and also petrographic studies, the lower boundary of the Kalat Formation with the Abderaz Formation is disconformable. The lower boundary of the Chakhmaghlo Formation with the Kalat Formation is gradual and conformable, while its upper contact with the Paleocene Pesteligh Formation is disconformable. Petrographic studies in Maastrichtian deposits led to recognition of 16 microfacies. These microfacies deposited in 5 facies belts including tidal flat, lagoon, shoal, reef and fore reef subenvironments in a carbonate platform. Manuscript profile
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  2 - Effects of the inclination of parallel no flow boundaries on the time- drawdown curves around a pumping well in a confined bounded aquifer
  Arash Nadri ezatolah ghanavati Nasrolah Kalantari
  The image well theory was used in the study of no flow boundaries effects on the drawdown around pumping wells. Most studies are concentrated on the vertical no flow boundaries, while, in some cases these boundaries are not vertical and have inclinations. To the best of More

  The image well theory was used in the study of no flow boundaries effects on the drawdown around pumping wells. Most studies are concentrated on the vertical no flow boundaries, while, in some cases these boundaries are not vertical and have inclinations. To the best of the authors knowledge, the problem of the inclined no flow boundaries has not been studied yet. The effects of the parallel no flow boundaries inclination on the drawdown around pumping wells in bounded aquifers is studied here. The time-drawdown data for vertical boundaries have used the numerical simulation and also the image well theory. The effects of inclination of the boundaries were only considered using the numerical simulation. The results of numerical simulations and image well theory for vertical no flow boundaries were matched completely. The computed drawdown for observation well in the models with inclined and vertical no flow boundaries used to compute the difference between them. The difference between these cases depends on the distance between the boundaries (width of the aquifer) and the inclination value. The results showed that in large widths and low inclinations, the computed drawdown in aquifers with vertical boundaries are almost similar with the computed drawdown in aquifers with inclined boundaries and the differences can be neglected. In the other words, the difference between the vertical and inclined cases in smaller widths is so high that even in the low inclinations, the differences can't be neglected. It can be concluded that the image well theory as we know, cannot be used in inclined no flow boundaries. Manuscript profile
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  3 - Biostratigraphy and paleoecology of the e Member of the Qom Formation based on Ostracoda at Cheshmeh Boroun section, West of Qom
   Daneshian مسعود گودرزی
  The aim of this study is determining systematics and identification of ostracods genera and species of the e Member of the Qom Formation at the studied section (Cheshmeh Boroun) for biostratigraphy and age determination, and palaeoecological investigations considering t More

  The aim of this study is determining systematics and identification of ostracods genera and species of the e Member of the Qom Formation at the studied section (Cheshmeh Boroun) for biostratigraphy and age determination, and palaeoecological investigations considering the abundance and diversity changes of ostracods based on the collected data. The abundance and diversity of the ostracods taxa such as Paracypris، Aurila ،Ruggieria ،Loxochoncha ، Krithe، Xestoleberis, Cytherella mostly suggest a marine environment with normal salinity and warm climate from ecological point of view. However, the increase and decrease of these taxa in the studied section indicate the diversity and abundance changes is related to environmental changes. In fact, this shows the instability of the environmental conditions which seems to be affected by the changes of food and oxygen values, and water turbulence. Based on ostracods assemblages, an Early Miocene age ( Aquitanian- Burdigalian) is exclusively suggested for the e Member of the Qom Formation at Cheshmeh Boroun stratigraphic section. Manuscript profile
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  4 - 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
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  5 - Determination of relationship between sedimentological parameters and morphology of linear sand dunes in north of Ahangaran, east of Iran
  Benyamin Rezazadeh Arash Amini Gholamreza Mirabshabestari
  Field studies and satellite images confirmed the existence of linear sand dunes in the north of Ahangaran region, located in Zirkouh (southern Khorasan province), east of Iran. In evaluation of sand dunes, totally 21 sand dunes from 5 stations in different geographical More

  Field studies and satellite images confirmed the existence of linear sand dunes in the north of Ahangaran region, located in Zirkouh (southern Khorasan province), east of Iran. In evaluation of sand dunes, totally 21 sand dunes from 5 stations in different geographical locations were studied. The obtained sedimentological evidence revealed that Ahangaran sand dunes can be classified into two simple and composite groups morphologically. Results of sedimentological analysis also indicated a positive correlation between particle size and morphology of dunes; i.e. with changes in sedimentological parameters, the morphology of sand dunes grades from simple to composite forms in central and western part of the studied area. The fine-grained pattern of crest is another characteristic which were introduced for the studied linear sand dunes. The comparison of the sedimentological parameters of these sand dunes with the other places of the world such as Kalahari, Namibia, Australia and Egyptian Sinai indicate that the Ahangaran sand dunes with an average of 2.34φ in grain size is similar to the other regions, but have lower sorting in the range of 0.79 which is more outstanding than the other parts of the world. Manuscript profile
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  6 - Assessment of the activity in the gap zone of the Rudbar Fault, based on the morphotectonic indices of the Sefidrud River, Gilan Province
  Shoja Ansari
  In this study the morphotectonic indices for a specified length of the Sefidrud River, which is located in the meizoseismal area of the 1990 Rudbar earthquake, have been investigated to constrain the activity of a gap between the Rudbar Fault segments. The Digital Eleva More

  In this study the morphotectonic indices for a specified length of the Sefidrud River, which is located in the meizoseismal area of the 1990 Rudbar earthquake, have been investigated to constrain the activity of a gap between the Rudbar Fault segments. The Digital Elevation Model (DEM) with 30 m resolution was used to obtain the elevation data. Fifteen km of the Sefidrud River also was divided into 100 -meter segments to calculate the morphotectonic indices. The morphotectonic indices include the sinuosity (SI), stream-length gradient (SL) and river long profile. The sinuosity in this region, where the trend of the Rudbar fault cut across the river, is approximately 1-1.5 and has a lower value relative to the other segments of the river. This indicates that the uplift possibly affected this region and then indicates the high tectonic activity. The stream-length gradient in the target region is approximately >3000 and has a higher value in the region which may be related to the lithological and active tectonic effects. The high value of SL can be used for determining the regions with high potential for the landslides along the strike of the Sefidrud River. The Sefidrud long profile, in aforementioned area, has a bulge or convexity. Such convexity together with the high value of stream-length gradient can indicate that the tectonic activities are significant in this region. By comparing the morphotectonic analysis with the seismotectonic studies such as the Coulomb stress changes due to the 1990 Rudbar earthquake, in which the high stress zones were detected in this region, it can be cluded that the studied region has high tectonic activities and consequently its monitoring to prevent the seismic hazard is essential. Manuscript profile
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  7 - Investigation of Pollution of Water Resources and Pollution Zoning in the Saroq Watershed (West Azerbaijan Province)
     Shahsavari Gholam Abbas Fanaei Kheirabad فرهاد  اسدیان
  Arsenic is a toxic element with environmental and health risks. The aim of this study is to investigate and monitor arsenic concentration level of pollution and its concentration zoning in the water resources of Saroq watershed. In this study, 45 samples from wells, sp More

  Arsenic is a toxic element with environmental and health risks. The aim of this study is to investigate and monitor arsenic concentration level of pollution and its concentration zoning in the water resources of Saroq watershed. In this study, 45 samples from wells, springs and river were collected in two stages (filtered samples in the first step and bulk samples in the second step). The position of sampling points was determined based on expert judgment and random method. Anions were analyzed by gas chromatography and metals were analyzed by ICP-MS. The overall results indicated that water was polluted by arsenic in some areas. Evaluation of the origin and zoning maps of arsenic in water revealed that the source of pollution is both anthropogenic and geogenic resources. Most of the geogenic sources are located in the north-east and east of the area on the alteration zones and is resulted from Quaternary volcanic rocks forming source of the hot springs in the study area. Mining activities are the most important cause of pollution in the downstream area of the mines in the north of area, thus, it can be said that anthropogenic origin is a major cause of pollution. Transfering and re-deposition of arsenic in the study area is controlled by the solution- deposition and absorb- disposal reactions, which is controlled by Eh and pH. Transporting and re-deposition of arsenic is done by oxy-hydroxides of this element. In general, except for the northern and north-western parts, in most parts of the studied area, the level of pollution is not that much high so by considering appropriate management there will not be much pollution problem in the area. Manuscript profile