نشریه نمک
سال یکم شماره 3 (زمستان 1390)

One of the most important problems in geology is determination of geological boundaries. The Alborz – Central Iran border zone is one of them and in this paper، geological concept of the Alborz – Central Iran border zone from the east of Tehran to the east of Semnan has investigated. In order to this، investigation area has divided to the northern and southern parts by consideration of geomorphologic characteristics. Then، sedimentary deposits of above parts have investigated and compared along the geologic time. On the other hand، there are two tectono-sedimentary zones، according to deformational style differences in the northern and southern parts. Finally، Attary، north Semnan، north Sorkheh، Garmsar and Parchin fault systems have considered as a geological boundary between two tectono-sedimentary zones. Also، Gharavol Kuh، Garmsar and Parchin faults have considered as a main factor of the surficial appearance of salt deposits in the Alborz – Central Iran border zone from the east of Tehran to the east of Semnan. These deposits are related to the Kond and the Lower Red formations

The Dashtak Formation (Middle Triassic) is one of the most important cap rocks of the Dehram group (Permo-Triassic) gas reservoirs in southwest of Iran. This formation has 625 m thickness in Kuh-e-Surmeh surface section and more than 2100 m thickness in Sartal-1 well and mainly consists of anhydrite/gypsum، dolomite، limestone and shale. The Dashtak Formation in these sections consists of various facies which related to sabkha، tidal flats، lagoon and barrier environments. Evaporite minerals mainly composed layerd and nodular structures and crystalline، needle، fibrous، lath/bladed، combination and pore-filling cement textures. Investigation of these structures and textures shows that the most of them were formed syndepotional (sabkha/tidal flats) and early diagenetic processes.

NasrAbad-eKashansaltstructure locates in Central Iran Basin، which is important fromitsstrategic and geographic situation. As it isa buriedsaltstructuresogeophysical and structural studiesarean integrated part ofexploration activities. Geodatabaseis a combination of seismic، wellandgravity data together with geological information/data. Seismic interpretation along with gravity and well data analyses suggest that the salt structure origin is related to Lower Red Formationevaporites. 3D-modelingof salt structure was created by geostatisticalmethodsandPetrel software. In order to gasstorageprojects، estimation of saltvolume and the origin of salt is necessary، which were presented by calculation of salt volume،surface geology evidence and deeper information data along withtheir relationship.

In this research the effect of sodium thiosulfate salt was considered for gold extraction from concentrate floatation of high copper grade sulfide ore in leaching process. Gold obtaining in the presences of pyrite and chalcopyrite minerals in leaching process is difficult. In thiosulfate ammonia and thiosulfate system، gold complex formation is considered in pH=10. 5-11 and room temperature. The experiments design of leaching bases، The results show that the maximum gold recovery for 1:3 of thiosulate is obtained، in 24 hrs and decreases to 12 percent after 72 hrs.

A new method of dispersive liquid-liquid microextraction (DLLME) combined with Spectrophotometry UV-Vis was proposed for the dopamin determination using (6 [monoboromo-panta-N-acotil-L-phenil alanino] -α-cyclodextrin) (3a-e-CD) as chelating agent from human blood plasma samples. This is a very simple and rapid method for the extraction and preconcentration of dopamin from human blood plasma sample. In this method، theappropriate mixture of extraction solvent (including 3a-e-CD) and disperser solvent (acton) was injected rapidly into the aqueous sample by syringe. Then، cloudy solution was formed. The mixture was centrifuged and the sediment on the bottom of the conical test tube removedthen injected to the cell sphectrophotometry and diluted with organic solvent. Some important parameters، such as kind and volume of extraction and disperser solvent، concentration of the chelating agent، extraction time، centrifuge time، pH and ionic strength of the aqueous solution were optimized. Under the optimal conditions، the enrichment factor and extraction recoveries were 295، %98-102% respectively. The linear range 10-400ppm and limit detection 0. 265 ppm were determined. The relative standard detection (R. S. D%) for 50 ppm of dopamine was 4/49% (n=5). The performance of the proposed technique was evaluated for determination of dopamine in blood plasma.

This experiment was conducted to investigate the effect of salinity on nitrogen fixation in Rhizobia and soybean symbiosis system. Soil and water salinity are the most important factors to decrease of agricultural productions in arid and semi-arid regions. Also nitrogen is one of the macro elements that plants need to growth. Biological fertilizers can use instead of chemical fertilizers for nitrogen fixation. In order to study of salinity effect on the dry matter production for both above ground portions and the roots and also percentage of the plant uptake Nitrogen، a greenhouse experiment was conducted. Greenhouse experiment was done in a completely randomized factorial block design. 4 treatments (blank، Nitrogen، granular inoculant using and powder inoculant using) 3 levels of salinity (EC=0، 4، 8 ds/m) with 4 replications were used. After 90 days، in order to dry matter measurement، above ground portions and roots were cut and put in 110ͦc oven for 48 hours. The data were analyzed by SAS software for statistical evaluations. Results showed that the amounts of dry matter production for both above ground portions and the roots and also the plant nitrogen uptake percentage were shown significant difference between salinity treatments. In EC=0 ds/m، the powder form treatment was shown the highest nitrogen uptake percentage، then granular inoculant، nitrogen treatment and blank respectively. However in EC=4، 8 ds/m the granular form treatment was shown the highest nitrogen uptake percentage، then powder form inoculant، nitrogen treatment and blank respectively.

Many micro organism need to nutrients for interplay nutrification. In this research، five kinds of micro organisms in different salts، HP،D2،D1 and 9k media were considered in bioleaching process. The specimens were performed in individual flasks that put in incubator for one week at 2 pH، the low grade sulfide ores were added to the micro organisms. The results showed the recovery rate copper extraction is 90% obtained in 9k media for low grade sulfide ore in Sarcheshmeh copper mine.