نشریه زمین شناسی محیط زیست
پیاپی 34 (بهار 1395)

The study area, located in north Torbat Heydarieh, contains ophiolitic units comprised by chromium-bearing minerals such as Spinel. The results obtained from water samples analysis using XRF indicate high chromium concentrations in ophiolite complex as major source. Serpentinite, the dominant lithology in the area, comprises excess chromium concentration, being responsible for chromium-polluted water resources. As well as average chromium concentration severely decreases from serpentinite to other lithological units. Hydrogeochemical investigation of water resources that major cations and anions are in the order of Na>Mg2>Ca2>K and Cl->HCO3->HSO42-, respectively. Regarding piper diagrams, water samples indicate a variety of facies (water type) including Na-HCO3 (3 samples), Na-Cl (3 samples), Ca-HCO3 (3 samples), Mg-Cl (3 samples) and Mg-HCO3 (2 samples). Comparing with WHO (2011) permissible chromium limit, water resources of the study area indicate excess chromium concentration. Due to limited chromite mining in the area, the anthropogenic activity
could not be responsible for the elevated chromium level in the water resources, suggesting the dominant geogenic source of chromium. The abundance of Fe-Mn oxy-hydroxides in most sites of the area leads to chromium oxidation from Cr3 to Cr6. Average values of pH> 7.6 and DO> 7.67 mg/l of the water resources also reflect that Cr chiefly occurs as Cr6 and Cr2O72- and CrO4- deposits.

Binalud watershed is located, South-East of Mashhad, that geologically, is a part of Binalud zone. Binalud watershed contanis three subbasins, which among them, Bazeh-Hour subbasin has been studied. Climatology, Bazeh-Hour area is arid and semi-arid, and, so, due to the various geological units, the chemical composition and the quality of the water has been changed, so, the type of water is sulfuate and chloride. Additionally, in terms of agriculture and human drinking is also acceptable. Thus sedimentology studies, along Bazeh-Hour river shows that three main factors, sudden changes of slope, entrance of minor channels and seasonal flood events, caused the sediments fabric variation, and parameters changing, such as sorting, skewness and kurtis. So, sedimentology and petrology studies show that the most sediments are very poor sorted, platykurtic and fine skewed, and basic and ultrabasic rocks are the main source of Bazeh-Hour deposits. Although, based on field studies, three facies associations are recognized, that consist four gravely facies, Gmm, Gmg, Gcm and Gci, two sandy facies, Sh and Sl, and three mud facies, Fm, Fr and Fl, and four structural elements, SG, HO, LS and FF are identified. In according to Bazeh-Hour river facies associations and structural elements, three depositional models, gravely bradied rivers with gravity flows, sandy meandering river and fining grain meandering river are suggested.

Hydrologic problems are important in urban management. Hydrograph is an efficient tool in this management. In this paper behavior of synthetic and real watershed is studied. In first equations of Kinematic Wave Theory have coded in MATLAB and finally by achieved model in MATLAB and use of GIS, reaction of watershed have assessment. In real watershed state, computed results have compared with a set of laboratory data (Observed Results). Comparison showed accuracy in regression. In second step, Islamshahr Watershed as a real watershed has assessment and by making isochrones, Time-Area curve was result by variety in rainfall intensity

The studied area is located in South West of Firozabad city in Fars province, south west of Iran, and structurally situated in Zagros zone. Tectonically, the area is active and has numerous salt domes. Existence of thick layers of salt in Hormuz complex and consequently appearance of salt domes in this area, effected on the ancient deposition and sedimentary basin. Salt rising on one side and subsidence of sedimentary basin on another side, caused of drastic changes in sedimentary basin near the salt dome. Range of changes is related to the depth of sedimentary basin and tectonic movements, during Permian period to present. During of sea regression and transgression periods in the wide Zagros basin, these changes effected significantly in salt dome rising areas. To achieve this goal, Mangarak salt dome in the southwest of Firozabad was chosen and researched data. The result of these studies indicate that salt dome has been rising at late Cretaceous - Paleocene and found great changes in thickness of sediments which around it.Absolutely, this salt dome existed before deformation of Zagros basin and probably it has been exposed such as island in late paleogene and Neogene (such as the Persian Gulf Island’s salt domes).

The Correct management watersheds is one of the most important methods is the optimal use of soil and water resources. To do this, it s need for comprehensive information of different methods administrative management. Recent decades, correct and timely assessment of quantitative and qualitative runoff is considered one of the concerns of the country's macro management.This project is modeling and evaluation and efficiency of the SWAT model to simulate the monthly runoff, sensitivity analysis, optimization of critical parameters, to evaluate the effect land use during the past four decades on Quantity of Maroon River watershed at the departure station (Idanak) in Kohgiloyeh and Boyerahmad. For this purpose, were used from semi-distributed SWAT model and SUFI2 program in the form of bundles SWAT CUP for sensitivity analysis, calibration, validation and uncertainty analysis.In this research first were prepared changes in land use map available as well as soil and vegetation in the watershed Maroon map within four ten-year period from 1980 to 2010 by using TM and ETM sensor of Landsat satellite .Observations Data of hydrometric Idenak station as base station was used during 1970 to 2010 in four ten-year period to observe changes in runoff during the calibration and validation. Compare the effect of land use management options on the different components of the hydrological cycle shows different amounts of runoff. Shows a the pessimistic scenario occurred in four decades. With continuing damage to the state in land use regression various amounts of runoff increases and decreases permeability and gullies on the surface and deep aquifers.

Nowadays geophysical airborne data have high importance for radioactive mineral exploration. In fact these data is major base for radioactive elements exploration. In this study by airborne radiometric data interpretation collected from Hashtrod 1:100000 sheet no. 5464 situated in north Iran expectation areas for uranium, thorium and potassium were recognized. Firstly, statistical parameters were calculated and radiometric element's histograms of the area were drawn using conventional statistics. Moreover, promising maps were drawn based on the dispersion around the mean. Then, concentration- area full logarithm plots were drawn by using fractal method and digit data collected in the area. Next, plots associated uranium, thorium and potassium anomalous areas were prepared after step separation of different environments (background, threshold, anomaly) had been done based on C-A angular coefficient curve. The correlation coefficients between These elements were determined after some tables of data scattering were drawn. The image Ternary radioelement map color space GRB earns in the region and finally to process the images and extract the most important forms of uranium anomalies identified hot area and the introduction of promising deposits of radioactive minerals indexes were examined for discovery proceedings.

Determination of the hydraulic interaction between the rivers and groundwater, as the most significant water resources in arid and semi-arid regions, attracted a great attention recently. In recent years, several methods have been used for the study of these water exchanges such as seepage meters, minipiezometers, temperature data loggers and the study of the physicochemical parameters. The Dez River that is the third largest river in Iran also is one of the important surface water resources in the northern part of Khuzestan province. In this research, the water physicochemical parameters were used to assessment of the interaction between the Dez River and aquifer in the north part of Dezful-Andimeshk district. To this purpose, the temporal and spatial variations of river and groundwater quality parameters have been studied. The physicochemical analysis results of the river and quality monitoring wells have been used for the temporal assessments of river-aquifer interaction. For spatial assessment of the river-aquifer interaction, 69 groundwater samples were collected from the abstraction wells. Hydrochemical diagrams such Piper and composition diagrams along with some statistical methods such as Cluster Analysis were applied to the interpretation of the results of the water samples analysis. Also, the PRO-GRADE computer code was used for evaluation of the achieved results. The results of this study show that the Dez River has a losing nature and its recharge water in to the underlying groundwater body can enhance the quality of the groundwater in the study area. The measured nitrate concentration of river and groundwater also shows the positive role of river infiltrated water on the groundwater quality