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  Polymetal mineral exploration at west of Meshkin-Shahr Overall Exploration Project Geological Survey of Iran by: Behruz Asvadi Kavoshgaran Consulting Engineers 1998
Polymetal Expl. Meshkinshahr
Polymetal mineral exploration at west of Meshkin-Shahr
 
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   Abstract
   Based on a contract between Industries and Mines Organization of Ardebil and Kavoshgaran Consulting Engineers, preliminary exploration for polymetal deposits conducted in a 24 Km2 wide area in the Meshkin-Shahr County. The project includes geological mapping (1:10000), geochemical survey (stream sediment), assessment of alteration and mineralized zones, excavation of 5 trenches, 100 cubic meters in volume, and systematic sampling. Because of diversity of lithology, mapping was done on the scale 1:10000. Alteration is widespread at north of the area.
   Total samples involve 50 stream sediment, 53 altered and mineralized samples, and 16 samples from rock units for XRF and petrogarphy studies. Also 14 samples analyzed by XRD and 12 samples studied for mineralography.
   Geologically, the area belongs to Tarom-Qaradagh magmatic subzone of Alborz-Azarbaijan Tertiary volcano-sedimentary belt. Granitoid intrusions are dominant exposed rocks in the region. They have intruded into volcanic and pyroclastic rocks. Based on petrographic and field evidence, two phases of intrusion are distinguishable. Each phase has its own characteristics. The first phase is characterized by quartz diorite, quartz monzonite, diorite and granodiorite pluton that is named Khan-Kandi pluton. The next phase contains quartz diorite, quartz monzonite and granodiorite with numerous andesitic to dacitic and rhyodacitic dykes. All magmatic phases have spatial and temporal affinity with each other. Eocene volcanic rocks exist at north of the area. They include pyroxene-andesite, latite, and basalt.
   Several mineralized and altered zones exist at granitoids and Eocene volcanics. Alterations in Khanbaz and Khan-Kandi intrusions are mainly epidotic, chloritic, sericitic and silicic. Eocene volcanics show hydrothermal alteration including alunitic, kaolinic and silicic.
 
 
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