نشریه زمین شناسی محیط زیست
پیاپی 19 (تابستان 1391)

Dalaki sulfur springs (Oba, Garuw and Rahdar), are hot sulfur springs in Bushehr province. The use of these hot water and sulfur springs for agricultural and some diseases treatment by area residents has a long history. Origin of these springs likely is mixing oil saline water of Asmari reservoir rock of Dalaki oil field with water sulphate Gachsaran formation place ran out are springs. This saline water has mixed with spring's water by fault system Qatar-Kazeroun that strongly influence on region. For evaluate these springs Hydrochemical state (determine type of water and identify the major elements and some trace elements) and its therapeutic potential in the 1389 sampling of spring water were performed. Type of these springs water is Na-Cl. According to study conducted Balneology of these spring water can be effective in the treatment of gastrointestinal diseases, skin and hair rickets, and the nerves. These springs despite many health benefits, due to downstream water quality degradation and their pollution and their hydrogen sulfide have devastating environmental impacts also.

The Dehno granite massive is located in the East Dehno village and southern Khomein city and within the metamorphic Sanandaj–sirjan Zone. The composition of these rocks include: granodiorite, quartzdiorite (tonalite), monzogranite and leucogranite. Quartz, alkali feldspar, plagioclase, biotite, andalusite, hornblende muscovite, tourmaline, zircon and apatite are examples of the existing major and minor minerals in these intrusive rocks. This body is host the tourmaline bearing silica veins and dykes and mafic enclave microgranolar aplitic (several) and doleritic (seldom). Mineralogy and geochemical studies this rocks indicated mantle Peraluminium and calc alkaline and mixing origin(melting of the oceanic crust of the Neo-Tethyan below Central Iranian Microplate) and anatexi melting (the melting of continental crust sediments) and rocks enrichment LILE elements such as granite(Rb, K, Cs) and the concentration of depleted elements, particularly HFSE Ti, Nb and P is consistent with the pattern of granites associated with the subduction setting and from the tectonic environment aspect, they are considered as the volcanic arc granitoids (VAG).

The pollution of the environment with toxic heavy metals is spreading throughout the world along with industrial progress. Removal of heavy metals needs advance chemical technology and is more expensive too. The cheaper alternative for this is the bioremediation using heavy metals resistant microorganisms. In this study, 5 heavy metal resistant bacteria were isolated from electroplating effluents collected from Islamshahr. The isolates grew well on nutrient agar containing 1 mM of chromium (Cr). The resistant isolates were identified on the basis of morphological, biochemical and physiological properties. Finally its molecular identity was revealed through 16S rRNA analysis. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolates belong to the following genera: Comamonas, Acinetobacter and Acicovorax. The minimum inhibitory concentrations (MICs) of the isolates were determined. All the isolates showed high resistance to chromium with MICs ranging from 4-6mM. The results suggest that the isolated strains obtained from effluent owing to its high resistance to chromium have a great potential to be employed for bioremediation of chromium contaminated effluents.

This is 165 m thick Mozduran formation, as a carbonate and siliciclastic strata, in Saleh-Abad section, consists of carbonate, sandy lime and siliciclastic rocks. Mozduran Formation relates to (Oxfordian-Kimmeridgian) age,locates conformably on Kashafrud and beneath Shourijeh Formation. The purposes of this study are: 1.The study of vertical and lateral changes in litho strata units, 2. identification, detachment and naming microscopic facies based on thin section, 3.The explain ton of digenetic events based on petrography events, 4.The explanation sedimentation history with using lithofacies properties and presentation the sedimentation model. Based on petrographic studies of 50 thin sections and two facies collection have been recognized. The Limestone facies collection consists of bioclastic grainstone pessessy Milliolidae (facies A, a lagoonal environment), sandy ooid grainstone, Bioclactic ooid grainstone, ooid grainstone with bioclast (facies B, a barrier environment), and Terrigeneous facies collection which is mainly composed of chert arenite and sublitarenite (facies C, a tidal flat nvironment). According to lithofacies, Mozduran Formation depositional environment could be interpreted as a carbonate plat form.

Base-metals sulfide mineralization in Galena and sphalerite forms with little amount of pyrite, in Mobarak and Elika formation have been occurred in the studied region. Chemically, all deposit phases have compositing hemogen region. Mineralization has been followed the fault general process in the region, and the main textures in the ore are vein texture and open space filing. Genetically, studied deposits are epigenetic. Field features essentially have resulted mineralogical investigations and geochemical surveys on trace elements and rare earth elements (REE), they have included ore metals source in sulfide Pb-Zn mineralization in Kelardasht region showed carbonate - hosted mineralized rocks (upper Paleozoic, lower Triassic) in deposit. In genetic relation between Pb-Zn mineralization in this deposit with Akapol monzonit quartz - monzodiorite intrusion (aged to upper Eocene - lower Paleocene), Were located near to studied Pb-Zn deposits, Akapol intrusion have played as required heating source that heated ore fluids. According to Eu negative anomalies in ore and host rock samples,and were seemed The source of hydrothermal fluids in the studied region have been the surface and atmospheric full - oxygen water (meteoric) have been warm through closing Akapol intrusion and have been solved the elements and then have been deposited them in the host rock fault crushes, cracks and joints, and then circulation in base-metals have enriched carbonate hosted units.

The studied region with 3750 km² is located in 65 kilometers in south-east of Tehran and 140 kilometers in west of Semnan. In this study, physical and chemical characteristics and engineering marl which are sensitive to erosion with various forms of Surface, Rill, Gully, and Channel Erosion have been investigated. It was taken 14 samples of marl surface with mostly Gully Erosion. The results of chemical analysis showed that the soil of this region is salin,alkali soils, from the viewpoint of engineering, soil samples within the SM, SW, SP, and SCM are considered. The granulometrie of soils showed that they are loamy to fine loamy. So they are susceptible to erosion. According to analysis to detect physical properties, chemical and mechanical engineering marl marked between amounts of salt, gypsum and lime are significant differences and these three factors can be an important factor in distinguishing erosion problems considered.

Koh-e- Siah anticline is located at 20 km NE of Dehdasht city. The studied area is very important from aspect of water resources in Kohgilooye & Boerahmad province. So the karstic resources as a strategic resource is noticed the government’s s province. Structural elements such as, faults, joints, folds and bedding patterns play an important role in the karstification and development of Karst water resource. In this research emphasis is given to investigating whether structural elements and topographic factors, mapped using remote sensing, aerial photo interpretation and derived from the geologic map can be correlated with hydrologic phenomena. With this assumption, various types of thematic layers have been prepared and integrated in a GIS environment due to the good correlation between above mentioned factors and hydrologic phenomena it was concluded that tectonic elements have a positive influence on the groundwater occurrence and they act as transmission routs in the limestone bodies.

The Pirtaqi dam will be constructed in 50 km eastern of Miyaneh and 45 km south-western of Khalkhal, on Qezel-Oezan River in Ardebil province. For the Pirtaqi site were purposed two dam site, named 15 and 15A. In this paper by using multi-criteria evaluation of AHP (Analytic Hierarchy Process), the preferred dam site for dam construction had presented. For selection of best dam site have been descript 8 criteria and 26 sub criteria,then had evaluated by using Super Decision software. On the base of preferred evaluations for sub criteria that had depended to Q, RMR, and DMR classifications, quantitative values of RQD, SPI and GSI, permeability of banks and bed rock, uniaxial compressive strength, deformation moduluss, stability and conditions of power plant tunnel, major joints and faults in dam axis, excavation volume, depth of weak pyroclastic rocks and alluvium texture, the 15A dam site has higher scores of pair wise comparison matrix and has been presented for preferred dam site.