نشریه زمین شناسی محیط زیست
پیاپی 16 (پاییز 1390)

The region of Khersan 1-5 dam is in Chaharmahal-Bakhtiari province. It is located 45 km west of Lordegan city. The reported earthquakes in this region are low depth type and have a focal depth less than 15 km. They also have no surface failure. The seismic hazard analysis illustrates the nature of seismicity of the site and is evaluated according to dispersion, fault type, morphology of faults, and past earthquakes data. Here, using tectonic maps of the site, arial and satellites photos, and the seismic data of the site, it have been tried that the seismicity of the site to be determined. Bazoft and Massan faults with 45 and 36 km length, are the nearest faults to the site. When they become active, they can provide an earth quake as big as M=7.0 and 6.9 richters, respectively. Bazoft and Massan faults have the ability to provide the MCLs as big as 0.269g, 0.222g, respectively.According to probabilistic seismic hazard analysis in the site, for return periods of 150, 475 and 2000 years, and according to Bender & Perkins (1987) method, and using)Seisrisk III (software, accelerations equal to 0.261g, 0.291g, and 0.310g, for the center of zone, are calculated respectively.

Most of Iran is mountainous and unachievable. In fact, by studying plains and heavy minerals in them, we can find mineralization, mineralogy and petrology of the regions surrounding it, easily. In order to the recognition river deposit that they were accounted as an important economical resources. The most important goals of these studies are discovering diamond from metamorphic sources, gold from igneous sources in placers and iron, copper and titan in placers and its surroundings altitudes. In addition to desert studies, geology and region maps, there are basic methods in this procedure which are including sampling in proper seasons, sample's preparation, heavy mineral tests with liquids with special gravity (bromoforum), hydro cyclone studies spectrography tests and XRD that matching them with altitudes giving us the best results. Sirjan placers are accounted as the models for this study, since the altitudes of Sirjan including Orumieh Dokhtar eocene volcanic and Sanandadj sirjan metamorphic rocks in which the coloured mélange with the width of 15 k.m. Since in most samples G, gold, as Pts (gram per 1000) was found. The possibility of gold sources in placers and its altitudes was large and by considering the existence of rutile and sphene in most samples for exploiting titan from placers, the formal explorations were essential since most samples contain titan having abundant iron. The existence of sources from titan – magnetic in altitudes, also the existence of copper minerals with high carat in samples, though does not consider the existence of placer sources from iron and copper as an economical, but consider the possibility of these sources in the altitudes. Uranium, gold and Hg, Ti,Zr deposits found at sirjan placers are economical and Fe,cu mines are existence in altitudes.

In order to determination of facies, depositional environment and sequence stratigraphy of carbonate and siliciclastic sedimentary sequences of upper devonian succession of Kuh-e-Zard (eastern profil) with 378m thickness, field and microscopic studies were performed. Facies analysis and petrographic studies led to the recognition of three silisiclastic facies (sandstone, shale and siltstone), two hybrid subfacies (sandstone micritic and allochemic sandstone) and seventeen carbonate facies were identified. The latter includes lime mudstone and intraclast packstone (representing peritidal environment), wackstone/packstone with molluscs and lime mudstone (representing lagoon environment), ooid grainstone with superfical ooid and intraclast and bioclastic packstone with a few dominant skeletal grains (representing shoal environment) wackstone/ packstone with brachiopods, echinoderm and ooids and wackstone with intraclast and oncolith and lime mudstone (representing restricted marine environment), peloidal wackstone/packstone, floatstone, grainstone/ rudestone with various bioclasts, boundstone, bioclastic packstone with abundant echinoderms and brachiopods and lime mudstone (representing open marine environment) and wackstone with bioclast and limestone conglomerate (representing mid ramp environment). Lateral and ramp subenvironment vertical variation of facies show that these deposits were formed on a homoclinal ramp. Sequence stratigraphical studies of the section revealed four 3rd order cycles. A deepening trend in an ascendig order, sparring frasnian to lower famennian was recorded.

The project study area, the city of Damavand in Tehran province, the villages of Zarrin Dasht and Hsarbn, this research for the first time in Iran and the unique changes in the structure of natural zeolite as a pilot for Damavand tested in the 3 years manager by minerals Ziolite Analsim was comprehensiv, the first model in the range of geological and topographical maps and identify the formation of eocene Zeolite zones and sampling intervals for systematic classification of network design and coding of samples and send it to the laboratory for chemical analysis and homogenized the (value of 500 g of the samples) and laboratory stages, which clinoptilolite type zeolite was detected, then the sample preparation process for the washing solution, the concentration of various such as 5 molar NaOH and 50 ml NH3 10% within the autoclave hydrothermal conditions in the furnace and poured into and After washing with distilled water, the samples we studied in two directions: the first path involves small samples for XRD analysis and the second sample was not crushed by the electron microscope, which combines the results of XRD studies and Zeolite with electronic microscope maximum 800X. so The results of this study can enhance the surface of the zeolite in the country of the world.

Soroosh (oil field) is in the north west of the Persian Gulf, 80 km WSW of Khark Island. Present research contains 6 Lab tests (PVT cell) which has been measured injection effect and gas solution of Burgan formation in Foruzan field in swelling criterion for saturated oil sample of one well related to Soroosh oil field at various pressures and reservoir temperature (180 Fº).Based on analysis results, by increasing swelling criterion the oil viscosity and oil formation volume factor will be decreased and increased respectively.Implementation of this process will be affected on production and recovery factor to increase.The maximum swelling criterion of oil for Sorosh field through gas injection on Burgan layer of Foruzan field in 4500 psig is equal to 28.56 % and the minimum swelling criterion of oil in 1000 psig is equal to 4.79 % at reservoir temperature.

In the present paper, fuzzy theory is used for the analysis of landslides and the state of Mohammad Abad landslide, located in Jiroft- Kerman road, is investigated using this method. Shear strength parameters, unit weight and piezometric level which have uncertainty are selected as variables and the statistic distribution of these parameters are obtained using best fit software. Also, using the limit equilibrium method, sensivity analysis is done the shear strength parameters with respect to the safety factor. Finally, the parameters are chosen as the fuzzy set and the stability analysis is done based on the limit equilibrium method. Results show that, since the fuzzy set considers a range of safety factors, stability analysis is done with more certainty and also, as the results show, the considered landslide is unstable.

Lak is a half mountainous area located about 40 km south of Boeenzahra and at about 140km south-west of Tehran. The area is mainly covered by igneous rocks. The geological study shows that mineral deposit includes andesite to basalt igneous rocks. The andesite units contains rich veins of lead and zinc. Various mining activities in the past such as surface extraction, transportation and weathering activities have increased the potential for distribution of heavy minerals in the soils around Lak area. Based on the completed studies heavy minerals in plant tissues and human were which identified which is shown in the result among certain various patients in the human population.

Sorhe basin with area of 36.43 km is located at northeastern of Karaj. Kahar With the age of Pre cambrian formation is also the oldest available stone in this basin and the newer stone units belong to Quaternary period. Stone units in Karaj formation cover more than 50% area of total range. This region is generally consisting of sediment stones. 6 main factors including geology, climate, tectonic, slope, plant cover and weathering influence the level of erosion of rock units. In this research the must important effective factor on erosion will be studied. using Arc GIS software, the level of sediment yield map and investigation of formation's erosion at Touchal basin was specified. Most important factors on erosion in this region are geology, tectonic and slope. based on MPSIAC related tables, maps get be prepared and finally the level of sediment at Sorhe basin will be achieved. Results of tests and studies by GIS certified that stone units of Sorhe basin are classified within 5 erosion groups in which Quaternary maps had very high erosion and Soltanieh formation had very low sediment. Surface geology was the must effective factor on Sorhe basin level of sediment including it was 889/27 at this basin.