The role of silica fractal distribution in textural evolutions and gold mineralization processes in Ramand region (Qazvin Province)
Subject Areas :Keywords: Textural evolution, Silica distribution Fractal Ramand Gold mineralization.,
Abstract :
Ramand region is a part of Urmia-Dokhtar magmatic belt that is located among a variety of crossed faulted structures and magmatic occurrences including Paleogene rhyolite and rhyodacite formations as the major related host units to hydrothermal ore deposits. Different kinds of clayey, silicified and Fe-rich alterations indicate a post magmatic vein type mineralization potential along Ramand crushed zones and structures. Well-developed alterations have been extended around volcanic extrusions with variety of textural zonation in quartz and chalcedonic vein systems similar to epithermal deposits. This research introduces a fractal based technique (Area-Concentration function) to obtain the priority map of Au-mineralization with an emphasis on quartzitic-pyritic textural evolutions in Ramand region. As a rule, self-organized crystallized textures (such as crustiform quartz) have more valuable ore content than glassy textures (vitrophiric), because of stepwise enrichment advantages in the hypogenic environment of epithermal deposits. Litho-geochemical sampling is the main and prior procedure for studying quartz textural zonation as well as instrumental quantitative measurement of the elements. Results showed a volcanic hosted formation with crustiform quartzitic textures is mineralized in the western part of Ramand region. Mineralized veins are specified by silica nonlinear distribution (SiO2) related to textural evolutions in the quartz-hematite facies (Au=820 ppb) as the main targets for detail explorations.
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