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  Semi-Detailed Mineral Exploration in Darmian County, Geological and Geochemical Exploration in Qoleh Maadan Zone
Exploration in Qoleh Maadan
Geological and Geochemical Exploration in Qoleh Maadan Zone
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بعديآخرين
   Abstract
  
   Semi-detailed geochemical analysis, chemical analysis of metal and heavy mineral elements taken form stream sediments, geological and alteration studies were carried out at Qoleh Maadan area about 8 square km. 1:50000-scale topographic map of Avaz and Khushab, 1:250000-scale geological and topographic maps of Gazik and systematic geochemical and geological information at 1:100000-scale were used during mentioned studies.
   The study area is in a hot and arid region. Local people subsist on agricultural and livestock products.
   Geologically, the study area includes Cretaceous volcanic rocks of andesite-andesite basalt composition. The Quartz-microdiorite body intrudes the above-mentioned rocks, so propylitic and sometimes argillic alterations are found in the intrusion area. In general, the study area is described as a volcano-plutonic state including Cretaceous volcanic rocks and Oligo-Miocene plutonic bodies.
   Sampling at semi-detailed scale was done. 110 geochemical samples (-80 mesh) and 20 heavy mineral samples were taken (13 geochemical samples at every 13 km). Geochemical samples were prepared using (-200) mesh sieves and sent to Als-Chemex Lab in Canada. Chemical analysis was done for 35 elements. Microscopic studies were performed on heavy mineral samples for identification of important elements.
    Censored values of some elements like Au, As, Mo, S were replaced using Cohen Maximum Likelihood method. All data were inserted in Excel and SPSS and processed statistically. Statistical parameters of raw data, histograms and cumulative curves of elements were studied. Probable potential of each variable was determined based on raw data, for example high concentration of Au (14-167 mg/ton) in secondary halos was an evidence of the elementís hidden potential. Also, high concentration of Cu & Zn was found near an old mine in the study area. Outliers were detected and functions of the elements were normalized. Bivariate and multivariate studies were conducted on the functions of elements in such a way that correlation of geochemical data using Spearman and correlation of Au, Cu, Pb & Zn with other elements were taken into consideration. The results showed Au was available in the study area as an independent variable and had low correlation to other elements. Cu, Mn, Co, Mg, Al, Ni, Sc, Zn, Ti & Fe showed high correlation with each other. Cluster and factor analysis methods were used for better identification of genetic relationship, major elements were selected and factor map was drawn. Both methods showed the high correlation among Cu, Al, Mg, Mn, Zn, Co, Sc & Ni and also among V, Fe & Cr. In addition, Au & Mo showed high correlation. Data of mentioned elementsí anomalies were inserted in a table and shown in grid evaluation maps.
   Univariate analysis was performed for heavy mineral samples and statistical parameters of studied minerals were inserted in a table. A map showing the distribution of important elements was prepared. The results showed the concentration of scheelite (12-35 particles) in western parts of the area. Also, ferrous minerals like magnetite, hematite, goethite & oligiste were associated with scheelite. Celestine was enriched in samples taken from western parts too.
 
 
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