فهرست مطالب mohamadreza hosseinzadeh

Investigation of Contamination Potential in the area of Ahar Mazareh Copper Mine and Determination of their Origin.IntroductionInvestigating the quality of water resources in an area is one of the most fundamental issues in the study of contamination. The term “trace elements” generally refers to elements that are present in the environment in small concentrations and can be hazardous at concentrations above the permitted standard of drinking. The origin of these elements can be geogenic or anthropogenic. The geogenic origin of these elements is the earth's crust, and the anthropogenic origin can also be due to industrial, agricultural, and mining activities. One of the strategic tasks in the field of water resources is to provide chemical information in a way that it can be visually reconstructed. Mazraeh mine is one of the copper mines in Iran that uses a lot of water daily to concentrate copper through flotation, which along with other contaminates is directed to the tailings dam, Therefore, it is necessary to study the affected factors to the hydrochemical evolution and quality of surface and groundwater resources and to investigate the relationship between elements and contaminates and its impact on the quality of water resources and most importantly the origin of these elements and their relationship with mining and tailings dams. In this study, Hydrochemical study of water resources in the study area has been done by plotting methods such as Piper and Stiff diagrams. Multivariate statistical methods such as factor and cluster analysis were used to evaluate the origin of the trace elements.Materials and MethodsMazraeh copper mine is located 5 km from Mazraeh, and 120 km from Tabriz. It is located in the north of East Azarbaijan. Geologically, the study area is part of the Alborz-Azarbaijan structural unit. The geological map of the study area shows that the oldest geological units in the study area belong to the Cretaceous. Mazraeh copper mine reserves are of the iron and copper skarn index type. In general, in this study, on average, about 16 water samples were collected monthly from surface and groundwater resources in the area of the Mazraeh copper mine; The samples include 8 water samples from piezometers in the area, 1 sample from tailings dam, 1 sample from overflow of the tailings dam, 1 sample from water well of the village near the mine, and 5 samples from springs. Discussion of ResultsThe amount of electrical conductivity also varies between 254 and 1774 μS / cm. The amount of the concentrations of the major cations and anions in terms of the median are "potassium ConclusionsBased on the results, the Piper and Stiff diagrams plotted for water, the water type was mainly divided into two groups of sulfate and bicarbonate; the resource of water in the area corresponds to the geological formations of the area. The results of chemical analysis of about 290 water samples showed that some trace elements such as cadmium, lead, and cobalt have more concentrations than the standard of drinking water. The results of factor analysis showed that 4-factor groups were effective in the quality of water resources in the Mazraeh copper mine area. The second and the third factors were geogenic and the first and the fourth factors were affected by both geogenic and anthropogenic factors. The majority of trace elements in water resources are affected by the impact of formations and water-rock interaction. In the clustering method, amount of EC, sulfate, and calcium in the first cluster is more than in the second one, which indicates the effect of dissolution of sulfide minerals such as pyrite and chalcopyrite in the area. The amount of zinc and iron in the second cluster is more than the first cluster.

In the Gezeldash_daghi region, there is a significant outcrop of Miocene volcanic activity with andesitic composition associated with pyroclastic deposits including tuff, breccia and agglomerate. These rocks have porphyry to microporphyry texture with coarse crsytals of pagioclase, and matrix includes plagioclase, hornblende and minor biotite. Zoning, sieve texture in the coarse crystals of these lavas is an indicative of unstable conditions during magma solidification. These lavas have calc-alkaline nature. The geochemical characteristics of Gezeldash_daghi lavas such as LREE enrichment than HREE as well as enrichment of LILE elements with negative Nb, Ti and P anomalies indicate their affilliation to subduction setting. These rocks contain high amounts of SiO2, Sr, Sr / Y and La / Yb, and lower values of Y, MgO, and Yb than classic calc-alkaline volcanic rocks, and may indicate lava adakitic features. Based on the geochemical data, these lavas had formed partial melting of subducted oceanic crust. The depletion of rare earth elements indicates a residue containing garnet and hornblende in the source area.

Haftcheshmeh Cu-Mo deposit is located in East Azerbaijan province, Iran, with 28 km distance in North West of Varzeghan Area. In order to evaluate the hydrogeochemical properties and concentrations of heavy metals in water resources of the studied area, 14 samples of groundwater (springs and the leakage levels) and 10 samples of surface water area were collected. Samples were analyzed for major anions and cations, and some heavy metals including Zn, Cu, Pb, and Mo. This qualitative study showed that majority of samples collected from the range of deposit, under the impact of low pH, caused the release of elements of minerals and changed water quality for drinking, agricultural and industrial uses. But at farther distance deposits in the flow direction with decrease of contaminants the quality of water in these resources increased. Concentrations of Pb and Mo were higher than the standard values in the sample near the deposit, whereas the concentrations of Cu and Zn were lower than the standard values in all of the samples. Determination of “Heavy metal pollution index” (HPI) and “metal index” (MI) revealed that samples of groundwater and surface water near the deposit were not suitable for drinking and it could be harmful for the human health. Spearman correlation analysis of metals showed that the all elements except Mo were negatively correlated to pH, reflecting different geochemical behavior of Mo. The results of this research showed that it was necessary to study the environmental effects of this deposit before start of mining.

The study area is located in the north of Eastern Azarbaidjan (NW Iran). In this area, mineralization of molybdenum-copper is associated with intrusive bodies and developed in the center of Gharehdagh (Gharehchilar-Gharehdarreh) batholith. Petrological and petrographic investigations show that the intrusive bodies have compositions from diorite,through monzonite and granodiorite to granite. These bodies are I-type and mainly metaluminous and calc-alkaline with medium to high potassium belonging to volcanic arcs (VAG) tectonic setting. The principal alterations zones in the mineralized areas include silicic, potassic, phyllic and propylitic. Potassic and potassic-phyllic alterations are frequently seen around the molybdenum-bearing veins and veinlets. The proportions of Mo, Si, K, Rb, Ba and REE's are increased in differentiated biotite-bearing acidic intrusive bodies. Enrichment of K, Rb and Ba and depletion of Zr, Ta, Y, Yb and Nb in intrusive bodies indicate metasomatism of upper mantle materials with subducting oceanic crust and subsequent generation of magma and its passage through relatively thick crustal rocks.The intrusive bodies associated with Mo-mineralization have often quartz-monzonitic to granodioritic composition.