JOURNAL OF EARTH AND RESOURCES
Year:2010 | Volume:3 | Issue:3 (8)|Papers Count:9

The surficial spreading of evaporitic deposits has destructive effects on the quality of water and soil resources. In this paper, the reasons of the surficial spreading of evaporitic deposits in the Varamin-Semnan area have investigated. Therefore, faults have considered as a main factor of the surficial appearance of salt deposits. This deposits are related to the Kond and the Lower Red formations and they are spreading under the warm and dry climatically conditions now.

Geochemical anomalies separation from background is an important stage in mineral exploration. Nowadays, methods basis fractal geometry are very applicable according to their advantages such attention to as surface and spatial data distributions and anomalies geometric shapes. Concentration-area (C-A) method is very applicable and one of its important advantages is multifractal nature of elements distribution in any region. These natures could help for determination of elements enrichments stages. It is multifractal modeling. Main goal of this study is Pb, Zn and Cu anomalies separations from background in poly metallic Ipak deposit in Tehran province. There is an old lead mine. First, 75 lithogeochemical samples were collected and analyzed. Next, the area is gridded and evaluated grades. Then, C-A log-log plots for these elements were drawn and anomalies separated from background. Basis multifractal modeling results, elements distribution maps drew and anomalous populations were separated by high accuracy. Multifractal natures of these elements show that there are 2 or higher enrichment stages for the elements. Finally, these maps composed by economic geology data and faults that it shows high level of accuracy multifractal modeling. Best anomalous area situated in centre of deposit and low intensive anomaly situated in western part of this deposit.

In this paper, joints mapping in the Sungun porphyry copper mine by the Scanline common method, with the aim of field rock mass engineering classification, and the study of the geomechanical and slope stability conditions, accompanied by the result of these data statistical processing, was performed. So with the analysis of the results about the hydro mechanical numerical modelling of the different 2-D blocks in the mine limit, it is observed that in the southern parts of the mine walls, unstability is more than the western and northern areas, and the quality and strength conditions of the field rock mass toward the north, increases, that this matter is related to the presence and ground water flow from southwest to northeast of the mine and the high pressure of this water at the behind of the mine walls especially in its southern parts. Indeed, unsuitable and unstable conditions of the rock mass, from the south to north of the mine, from surface parts of the rock mass to deep parts of the blocks as more expanded and towards the left and right pillars of the blocks different more concentratedly, that can be referenced to the stress distributions condition in different parts of the mine rock mass. In the Sungun copper mine, two main joints sets in the each kind of main rock materials, included Sungun porphyry (SP), Dyke A (DK1-A) and Dyke B (DK1-B), with 6mm aperture and infilling materials of clay and iron oxide. joints were recognized with rough and slightly weathered surfaces, damp, with 10-20m persistence and 1m mean spacing.

Rock fill material which is called "Gravel and Sand" is the most usable material for building. The resources for gravel and sand are as below: alluvial sediments, alluvial fan sediments, coastal sediments, tillites and spoil. The new alluvial sediments are the most important resources for gravel and sand because this sediments can easily used because of there distribution on surface and weakness of bonding between particles. In these paper characteristic of engineering geology of rock fill which often is the resent alluvial (fan alluvial) which seen beside of river from Rood ball dam has been assessed.4 resources have been recognized and 23 boreholes drilled (0-4m). Samples has been tests to determined grain distributaries, physical properties, flat and elongated particles, soundness, AIV, CIV and Loss Angeles abrasion. Whit review of test result the rock fills based on unified system. According to this classification system these materials varies form GW to SM. Attention to other engineering geological properties of these material can be used for various region of dam such as shell, filters, drains and concrete.

From the viewpoint of Rare Earth Elements (REE) and U-Th radiation the Saghand fifth anomaly is considerable to be study. For understanding the agents controlling above mineralization are the main purpose of this study. In relation to this purpose, the different group of rocks descriptively determined, and two main types of rock including: 1- Intrusive rocks (Peridotite, Pyroxinite, Gabbro, Granitoeed and Diorite porphyry) 2- Volcanic and pyroclastics (Diabase, Dacite porphyry, Spilite, Andesite amphibole) were identified, but most of them under the mineralogical-structural changes, and the effect of hydrothermal solution were strongly deformed and metamorphosed, produced different metasomatite facies such as (Albite Amphibole Metasomatite, albite Metasomatite, Amphibol Metasomatite, Carbonate Metasomatite) the rare earth element enrichment and U-Th radiation controlled by this process.

The mineral zone of Misse Choli as a part of Khotbe Sara heights is located in the north of Talesh. Igneous rocks including latit andesit and latit andesi basalt with a porphyritic texture, along with alittle tuff, have exposure in the region. In dyke region (about 2-4 metes width and 1.3 km length) of andesi basalt sort exists whish has cut the Igneous rocks and has laid inside them.Same of the Mineralzed vens and veinlest near this dyke are locate. Mineralzation occurs in a stratification layer which is from lava and volcanoclastic which often brecciated.Mineralization is controlled by zone faults, and the mineral veins in the side and along the faults, in the andesitic breccias lava can be seen. The most important minerals in the regiou are: native copper, malachite, chalcocite, covellite, and Cuprite which in the form of veins, veinlest, and amygdule-filling blebs in andesitic lava con be seen. The average assay of copper in mineral veins is about 4 percent. The most important paragenetic copper is: silver, arsenic. iron oxsids and occasionally lead and zince. Considering the sort of home rock which is andesiti, form and the kind of mineralization in the form of which veins, veinlest, and amygdule filling blebs in andesitic lava can be observed, anomaly geochemical copper, silver and arsenic element, and finally the results of fluid inclusion which show that, inclusion in quarts and calcite are filled at 112 to1980 c. It is likely that mineralization in the related field accords with the preseuted model of andesitic kind.

The Sefid roud Dam is located in the South of Manjil on approx.200 km north west of Tehran and 100 km South of Caspian Sea in the contact Point of Ghezel Ozan and Shahroud rivers. The Studied area is Situa ted in the Shahroud branch and in Manjil regian.The main Soientific aims Of this study area: Surveery of Mineralogy, chemical preparation and physic mechanical properties of clay deposits bhind of the sefid roud Dam in Shahroud branch. Applied aims of this study are: The industrial Utilizations of the mentioned clay deposit, also kind and using method of them which have been compared with the standards for producing the bricks. Then for realization of these aims, after Preliminary studies and reconnaissance of 9 different sites, sampling by digging small shafts with 60–80 cm depth without pollutant in the Shahroud branch and from the locations with more deposits has been done and also the standard distance between sampling locations observed. Thenceforth, clay particles of samples separated and sent for analyzing. Also, the chemical analysis o samples by wet chemistry methods have been done in the Geological Survey of Iran. Afterwards, for Surveying the mineralogical, XRD test has been done on two series of samples contain of bulk samples and clay particle compositions separated samples. For determining of phy sicomchanical proper ties such as Grain size green and dry strength, firing color, shrinkage, absorption and etc. between 3 samples from, samples (z2, z8, and one mixture of all of the samples) have been. These 3 samples have been selected for physico mechaincal tests selected after determining the firing color. and notice that thay had the monotonous chyemical admix ture in Taba restan Tile factorys Laboratoy. Finanly in mentioned to the results of all tests and comparing uith national standard No.1162 from Institute of standard and industrial research of Iran, we understood that the clay deposits from the selected site can be used for producing the bricks which are one of the most important needs of Gilan province.

The Mehr Aran mine is located in North of Haji Abad, Hormozgan, and South of Iran. The aim of the research was to find the geological, geochemical and mineralogical features of the mine. To achieve the aim we analyzed 8 samples from stones by XRF. Also we studied 10 thin sections from these samples. The petro graphical, geochemical and mineralogical results show that the main type rocks are limestone and dolomite which have been originated from Carboniferous and Permian formations. The samples are mainly composed of calcite and dolomite and rarely clays. The geochemical results show that the rocks have low content of SiO2, Al2O3, Fe2O3, S and high in MgO (19%) and CaO (55%) relative to crushed stone standard. The evaluation of reserve show that the dolomite+limestone reserve is 56.5 Mt and the limestone reserve reserve is 39.5 Mt.