Geological evolution of major and minor elements and their relationship with gold mineralization in Chah-Bagh shear zone, Muteh Mining district

Category Environmetal Geology
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      Chah-Bagh gold deposit is located in Muteh mining district, 60 km SW of Delidjan. It is a gold deposit hosted in a ductile to ductile-brittle shear zone and is categorized in orogenic gold deposits. Concentration and distribution of elements from the analysis samples collected from lithogeochemical profiles perpendicular to ore-bearing zones, showed geochemical changes of major and minor elements in host rock lithologies and encompass ore-bearing zones of different deformation and alteration. According to the present study, silica, titanium, sulfur and iron of major elements and arsenic, molybdenum, tungsten and chromium of minor elements showed positive correlation with high-grade zones accompanied by deformation and alteration. Calculated correlation coefficients in correlation matrix of elements showed a maximum gold positive correlation with potassium and tungsten and to a lesser amount with silica. Moreover, gold showed a weak positive correlation with Arsenic, Iron, Sulfur and Lead. According to the calculations, gold showed a maximum negative correlation with sodium, aluminum and vanadium and to a lesser amount with nickel, cobalt and zinc and the least negative correlation with molybdenum and antimony. Gold, silver, silicium, iron, sulfur and arsenic positive correlation showed that gold mineralization and other accompanying elements as well, are the result deposition of silicic fluids containing auriferous bisulfide complexes, during a homogenous alteration in an intensely deformed shear zone. It seems that geochemical changes of major and minor elements of Chah-Bagh deposit as sulfide and silicic alteration shear zones of high deformation (mylonite-ultramylonite) can be an exploratory guide for gold deposit prospecting of this type.

tags: ZANJAN