Mohssen moazzen Department of Earth Sciences, University of Tabriz, 51664, Tabriz author Mahdi Ghaderi Department of Earth Sciences, University of Tabriz author William Downey Geoscience Department, University Brunei Darussalam, Tunkgu Link, Gadong BE 1410, Brunei Darussalam author Hadi Omrani Department of Geology, University of Gorgan author text article 2016 eng The protoliths of metamorphosed argillaceous rocks from the Garmichay area in the East Azerbaijan province of NW Iran were clay-rich sediments of reworked nature, originating most likely from an andesite to andesite-basalt source and deposited in an active continental margin tectonic setting. The protoliths of the Garmichay metapelites experienced low to moderate chemical weathering. Andalusite, cordierite, biotite, and muscovite are produced due to metamorphism under low-pressure and medium-temperature conditions. Cordierite throughout the whole assemblages is altered to the pseudomorphs pinite. Some rock samples contain both andalusite and altered cordierite as porphyroblasts, whereas others contain only andalusite or altered cordierite. Pressure and temperature estimates indicate that pressure for metamorphism was in the range 1-2.5 kbar with temperature between 500-600°C. Major oxides abundance show similar values in all analyzed samples, while concentration of some minor elements, especially zinc, show meaningful differences in rocks with different metamorphic mineral assemblages. The variations in the abundance of these minor elements may have played important role in the control of the mineral assemblages present. University of Tehran 2228-7817 6 v. 1 no. 2016 1 18 https://geopersia.ut.ac.ir/article_57817_7771313106c6477277ade4d0408a7344.pdf dx.doi.org/10.22059/jgeope.2016.57817 M.H. Ghobadi Bu_ Ali Sina university, Hamedan, Iran author Fateme Naseri Bu-Ali Sina university author text article 2016 eng The cold climate is a favorable parameter for the development of tension cracks and decrease of rock brittleness. Therefore, this paper attempts to investigate the Hamekasi porous limestone in order to predict the brittleness indices during freeze-thaw cycles. The freeze–thaw test was executed for one cycle including 16 h of freezing, and 8 h of thawing. The geo mechanical properties and brittleness indices (B1, B2, B3) of limestones were measured across freeze-thaw cycles from cycle 0 (fresh rock) to cycle 40. Statistical analyses, including simple and multiple regressions, were applied to identify those geomechanical parameters that are most influenced by the progression of freeze-thaw cycles and more appropriate for the brittleness prediction. Based on simple regression, all geomechanical properties including tensile strength (), uniaxial compressive strength (), P-wave velocity (Vp), porosity (n), and quick absorption index (QAI) (except dry density ()) demonstrated good correlations with brittleness index (B3). The integrated prediction of brittleness is put forward to develop some models by multiple regression (MR) and artificial neural network (ANN) with some statistic parameters (R, RMSE, VAF and ME), based on all geomechanical properties examined in this research. It is concluded that models based on n, Vp and  exhibited high performance according to the obtained statistic parameters. In spite of the fact that Vp has good correlation coefficient (R) with freeze-thaw cycles, and B3 (R2= 0.74, and 0.55, respectively) in simple regression, it does not have a prominent effect on B3 in MR models. Also, parameters with low correlation coefficient in simple regression (=0.15) cannot improve the model performance in ANNmethods University of Tehran 2228-7817 6 v. 1 no. 2016 19 33 https://geopersia.ut.ac.ir/article_57819_f0662191e5ee648bda73fe5969f982be.pdf dx.doi.org/10.22059/jgeope.2016.57819 Vahid Rastegarian Postgraduate student in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan author Mojtaba Heidari Assisstant Prof. in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan author Behrouz Rafiei Associate Prof. in Sedimentary Petrology, Bu-Ali Sina University, Geology Department, Hamadan author Yazdan Mohebi PhD student in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan author text article 2016 eng A research program was conducted on different clay-bearing rocks selected from the Ilam, Sarpol-e Zahab and Tajarak regions (Iran) to predict their slaking characteristics. The new durability apparatus (nested mesh drums) separates disintegrated particles varying from > 25.4 to < 2 mm as the drums were rotated. On the basis of the particle size distribution, the disintegration ratio (DR) was used to evaluate the rock durability. A concept was proposed to describe the rock slaking characteristics under the slake durability test cycles, by using the difference in the DR values between the adjacent (ΔDR) and backward (N*) cycles. This allows the estimation of the rock durability as it is subjected to a larger number of test cycles, and hence the prediction of the effects of weathering processes. This prediction provides an effective approach when data are limited or inaccessible. Therefore, a new classification system is introduced for rock durability assessment. The test results show that the Gurpi-limey marls (G-2, G-3) and the Pabdeh-marly limestone (P-3) are classified as moderate to high durability rocks University of Tehran 2228-7817 6 v. 1 no. 2016 35 43 https://geopersia.ut.ac.ir/article_57820_9ee63eeb8ffca9b2f03c7d8c5a1de463.pdf dx.doi.org/10.22059/jgeope.2016.57820 Feridon Ghadimi Department of Mining Engineering,Arak University of Technology author Mohammad Ghomi PhD student Candidate, Amirkabir University of Technology, Department of Mining and Metallurgical Engineering, Tehran, Iran author ٍEhsan Malaki Department of Mining Engineering, Arak University of Technology, Arak, author text article 2016 eng Iranian Cenozoic magmatic belt, known as Urumieh-Dokhtar, is recognized as an important polymetallic mineralization which hosts porphyry, epithermal, and polymetallic skarn deposits. In this regard, multivariate analyses are generally used to extract significant anomalous geochemical signature of the mineral deposits. In this study, stepwise factor analysis, cluster analysis, and concentration–area fractal model have been used to delineate geochemical anomalies associated with skarn mineralization, based on Au, Cu, Pb, Zn, Ag, Mo, W, Sn, and As stream sediment data. These results indicate that the Urumieh-Dokhtar belt potentially hosts Au skarn deposits. The hybrid method combining the statistical analysis and C-A fractal model is an effective tool to identify geochemical anomalies University of Tehran 2228-7817 6 v. 1 no. 2016 45 61 https://geopersia.ut.ac.ir/article_57821_7cc259c5db67234eb3b098cabbcad921.pdf dx.doi.org/10.22059/jgeope.2016.57821 kobra Sheikh leiveci univercity author Gholam Abas Kazemi Faculty of Earth Sciences,University of Shahrood, Shahrood, Iran author NoorAli ِDamough Khuzestan Water and Power Authority, Ahvaz, Iran author text article 2016 eng IInfiltration rate and hydraulic conductivity are immensely important parameters for evaluating the hydrology of subsurface environments. Specifically, in disposal wells schemes and in artificial recharge plans both properties must be correctly assessed to better analyze the performance of these installations. In a new research, tanker water and rainfall runoff were injected into a 22.5 m deep well dug in a 15 m thick dry overburden and the underlying impermeable marl bedrock (7.5 m) to evaluate the feasibility of using the well to store winter runoff in the overburden for recovery in the summer. Rates of rise and fall in the hydraulic head were measured, and infiltration rate in various depths were calculated. Also, hydraulic conductivity of the overburden was calculated using particle distribution curves of the overburden samples. Infiltration rate showed close correlation with the hydraulic conductivity. Maximum infiltration rate occurs at depths of 10-11 m; depth of 10 m is the most conductive interval. New findings have come out of this experience including 1. negative correlation between maximum head generated in a specific injection event and the rate of infiltration and 2. the important role of the contact zone between bedrock and the overburden in draining the injected water University of Tehran 2228-7817 6 v. 1 no. 2016 63 73 https://geopersia.ut.ac.ir/article_57822_1d7ae40c1658a686b6c17f365a9efc56.pdf dx.doi.org/10.22059/jgeope.2016.57822 Amir Hatefi Ardakani Semnan University author Mohamad Ekhtesasi Yazd university author text article 2016 eng Nowadays the use of remote sensing and Geographic Information System (GIS) is one of the most powerful cost effective tools to identify and discover the available groundwater resources. In this paper, Lithological Units, Lineaments, Slope, Topography, Drainage density, Vegetation and Isohyets lines have been achieved by stations and through remote sensing and GIS techniques. All layers of different classes were initialized through hierarchical analysis to potential areas of groundwater and after modeling in GIS Environment, Mahdishahr zone was classified according to the potential groundwater basins. The results show that in the 7 reviewed criteria by the expertise and Analytical Hierarchy Process, geological criterion and lineaments with the relative importance of 0.33 and 0.22, respectively, have greatest importance and priority for potentiality of groundwater in the region. Also in the studied area, Quaternary Alluvium consisted of old and new terrace and river sediments have the highest relative importance and desirability and terrace resources and the elevated old and low height new Foothill Alluvial fans are considered as good potential areas of groundwater. Shemshak Sandstone formations and Barut with a high density lineaments and Tizkouh formation with the thick layers of limestone and Barut are also good areas for groundwater University of Tehran 2228-7817 6 v. 1 no. 2016 75 88 https://geopersia.ut.ac.ir/article_57823_c30089d1ca5d750e2faa4fb74dc5d8f3.pdf dx.doi.org/10.22059/jgeope.2016.57823 Gholam Hossein Karami Faculty of Earth Sciences, Shahrood University of Technology, Shahrood author Rahim Bagheri Faculty of Earth Sciences, University of Shahrood, Shahrood, Iran author Farzaneh Gharehzaeh Faculty of Earth Sciences, Shahrood University of Technology author text article 2016 eng Important karstic aquifers exist in west and southwest of Iran. Mansour-Abad Karstic region is located in Shiraz, southwest of Iran. It supplies the drinking water for the whole area by 4 pumping water wells, some of which have water turbidity problem. The present research aims to assess the hydrogeochemistry and turbidity problem in the karstic water production wells. The EC varies between 703 (in well No.1) and 1096 µmohs/cm (in well No.4). All water wells have similar ion concentration trend, indicating the same origin. The dissolution of gypsum during dedolomitization process induces the transformation of dolomite to calcite in the study area, especially in well No.4. The concentrations of most trace elements in the study area are lower than the standard value. Bacteriological water parameters are outside the accepted limits recommended by WHO for drinking water. Wells No. 1, 2 and 3 have turbidity values greater than limited values for drinking water which is about 5 TU; therefore, only well No.4 is used as drinking water resource in the study area. Most probably, interference of clay mineral layers with groundwater flow is one of the main causes of turbidity in some wells. University of Tehran 2228-7817 6 v. 1 no. 2016 89 103 https://geopersia.ut.ac.ir/article_57824_c9937ec2a85631f9b833a33dd07f09c7.pdf dx.doi.org/10.22059/jgeope.2016.57824 Peyman Afzal بخش مهندسی معدن دانشگاه آزاد واحد تهران جنوب author Mehdi Rezaie Department of Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran author text article 2016 eng This study aims to recognize effect of Ordinary Kriging (OK) and Inverse Distance Weighted (IDW) estimation methods for separation of geochemical anomalies based on soil samples using Concentration-Area (C-A) fractal model in Irankuh area, central Iran. Variograms and anisotropic ellipsoid were generated for the Pb and Zn distribution. Thresholds values from the C-A log-log plots based on the estimation methods revealed the presence of various geochemical anomalies within estimation variances which were compared in both methods. The comparison among the estimation variances for different geochemical anomalies based on the C-A fractal model indicated that the estimation variance is less in the OK method especially for extremely and highly Zn-Pb anomalies. The estimated variances for different Zn anomalies via OK and C-A fractal method are lower than fractal modeling obtained by IDW estimation. However, extremely and highly Pb anomalies due to OK method have estimation variances lower than IDW method. Based on the results, main Zn and Pb anomalies are situated in the NW part of the area. University of Tehran 2228-7817 6 v. 1 no. 2016 105 116 https://geopersia.ut.ac.ir/article_57825_1df95282b8f1705e47f059849d8617d0.pdf dx.doi.org/10.22059/jgeope.2016.57825 Atusa Honarmand ferdowsi university of Mashhad author Mohammad Vahidinia ferdowsi University of Mashhad author Abbas Ghaderi ferdowsi University of Mashhad author text article 2016 eng Study of a late Late Santonian to Late Campanian hemipelagic succession from Abtalkh Formation at the Bahadorkhan section (Central Kopet-Dagh) enabled us to verify paleoecology changes based on planktonic and benthic foraminifera assemblage. Bahadorkhan section is consisted of calcareous shale, lime marl, marl, and a few dispersed chalky limestone beds. Upper and lower boundaries of Abtalkh Formation are conformable with Abderaz and Neyzar formations. Since foraminifera are proper tools for paleoecological investigations, we used them in three methods to analyze the changes of paleobathymetry: 1) Van der Zwaan’s equations of determining depth and method (the ratio of planktonic foraminifera to benthic), 2) Leckie's morphotype model, and 3) investigating the changes of benthic foraminifera and the ratio of agglutinated benthic foraminifera to the utilized calcareous benthic foraminifera. Trox model (the ratio of epifaunal to infaunal (Ep/In)) was also used with the goal of identifying oxygen level and nutrients. According to the statistical counting, four stages of changes in depth and environmental conditions in this section with age range of late Late Santonian- Late Campanian were observed. According to the analysis, in the Early Campanian, P/B ratio and infaunal benthic are high which indicates the high level of water and eutrophic environment. In such an environment, nutrient and oxygen levels are respectively high and low. Then, at end of the Early Campanian and the beginning of Middle Campanian, water level decreases, and the environment moves toward oligotrophic conditions. During Middle Campanian and the early Late Campanian, water level increases again. Finally, during Late Campanian and along with the change of lithology to Neyzar Formation sandstones, we will witness the decrease of P/B ratio, water level drop, oxygen level increase, and nutrient decrease. University of Tehran 2228-7817 6 v. 1 no. 2016 117 128 https://geopersia.ut.ac.ir/article_57826_2a9359e5d45bda5897e2f8f220ec8d69.pdf dx.doi.org/10.22059/jgeope.2016.57826 Azam Mahanipour Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran author Amineh Najafpour Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran author text article 2016 eng A succession of Late Campanian- Early Maastrichtian is analyzed from Gurpi Formation with regard to the calcareous nannofossils. Correlation Matrix was applied for the first time to the entire nannofossil assemblage to reconstruct environmental conditions. A detailed quantitative calcareous nannofossil analyses is performed on samples in order to further investigate the climate events, and interpret changes of surface water temperature. The calcareous nannofossil assemblage is divided into 3 groups as cold, cool and warm water taxa. Although cold water taxa (Ahmuellerella octoradiata and Gartnerago segmentatum) are rare (less than 1%), cool (Eiffellithus turriseiffelii, Prediscosphaera cretacea, Micula staurophora, Zeugrhabdotus spp., Arkhangelskiella cymbiformis, Biscutum constans, Tranolithus orionatus and Lucianorhabdus cayeuxii) and warm (Watznaueria barnesae, Uniplanarius trifidus, Uniplanarius sissinghii, Ceratolithoides spp. and Broinsonia spp.) water taxa are more frequent. The number of warm water taxa is higher than the number of cool water taxa and a reverse trend can be observed between them. Concerning the temperature index (TI), four important trends of climate variability from warmer to cooler phases (two cooling phases and two warming phases) have been documented at the studied interval. According to the recorded data, two pronounced cooling event are observed at Late Campanian and Early Maastrichtian, respectively. University of Tehran 2228-7817 6 v. 1 no. 2016 129 148 https://geopersia.ut.ac.ir/article_57827_4f5852b2a67eab406c8628dd0e9e5587.pdf dx.doi.org/10.22059/jgeope.2016.57827 text article 2016 eng University of Tehran 2228-7817 6 v. 1 no. 2016 149 167 https://geopersia.ut.ac.ir/article_57828_b16bff773e8b143b894c64639b2264a9.pdf dx.doi.org/10.22059/jgeope.2016.57828