Evaluation and identification of heavy, toxic and micronutrient elements, by the help of geochemical sampling in the polymetallic Lobin Zrdeh index

In the aspect of medical geology, along with population industrialization, the variety of pollutants arise in environment. One of this pollutants which turns to the global problem, are heavy and toxic metals. These elements are among stable pollutants because they cannot be resolved like natural pollutants by chemical or biologic procedures.Due to evolutionary history of living creatures, most of the elements found in environmental ecosystems, may be essential for survival of all types of living beings from molecules to different species of animals and plants. But it is also proved that, all types of different living species are sensitive to more than allowed limits of metallic and non-metallic elements. The current study evaluates the heavy and toxic metals distribution such as Ti, Ni, Co, Mn, Zn, As, Ag ،U،Th ،Pb ،Hg، Cr، V ، Mo and Cu in Tarom region Heights, limited to Lobin – Zrdeh indices areas at Zanjan.According to the accepted principle among all scientific groups, all elements, molecules and minerals are described as toxic in some situations and may be accounted as environmental pollutants; and often are visible due to mining activities, transferring the industrial, mineral and biological waste waters and dusts. But they are Imperceptibly entered from visible and hidden outcrops and indices to environmental areas. This compounds are often redistributed as soluble or tiny dusts, transferable in atmosphere; in water and soil environments, and sometimes their densities in nature reach to the dangerous limits which pollute the natural ecosystems such as soil, plants, and surface and underground water bodies and therefore influences the living creature’s heath, directly or indirectly. The majority of heavy and toxic metals are ones with 5 gr/cm2 density. The toxic heavy metals such as mercury, cadmium, nickel, arsenic, copper, lead, cobalt, silver and Chromium, may lead to some important disorders and side effects such as cancer, the effect on Motor and peripheral nerves system, Hematopoietic system, Cardiovascular system, kidney damages, and accumulation in body tissues. As an example the heavy metals harm the living creature’s organs due to linkage with a special protein named Metallothionein.More than 180 samples have been taken directly and indirectly (microscopic) from all types of elements, heavy minerals from rocks, stream deposits and mineralized zones, in order to determine Genesis and index origin; and analyze the 42 elements by ICP, thin and polished section methods. Due to obtained data from histograms and cluster analysis and other geostatistical methods, the spatial distribution of metals in the region have been illustrated in separate anomaly maps and finally been overlapped with other density maps of human, animal and plant species, to arise a unique risk map. The possibility of using geostatistical approaches to prepare network maps provides a sufficient solution to illustrate zoning maps of heavy and toxic metals. Overlapping the resulted maps and Anomaly environments with agricultural areas and dense human settlements, may provide a nice base to evaluate the risk potential of heavy metal pollution. It is observed that the anomaly maps of heavy metals were approximately overlapped with human, animal and plants settlements maps, because The most important anomalies and high risk elements accumulations, is observed at the south western parts of Lehneh village and the pastures surrounding main stream, which itself is one of the important agricultural cores of the area. Such documented medical geological researches may be helpful to find high risk accumulation areas of toxic heavy metals with more than allowed densities, in human, animal settlements and agricultural regions. Paying more attention to surface and ground water accumulation areas may have a considerable role to identify the accumulation, distribution and absorption of toxic pollutant elements hotspots. One of the remediation techniques to reduce or eliminate the mentioned risk, is phytoremediation method, which by the help of plants, the absorption, consolidation and decomposition procedures are occurred sequentially.