Abstract: (263 Views)
Majid Abad region is located 32 km northeast of Ahar, East Azerbaijan province and northwest of Iran. In terms of structural-tectonic division, this region is located in the Alborz zone and is a part of the end margin of Urmia-Dokhtar volcanic belt. The constituent units of the region include Eocene igneous and pyroclastic rocks with andesite, trachy-andesite to trachy-basalt composition and Oligocene intrusive masses with monzodiorite and gabbro composition. As a result of the hydrothermal processes formed from these intrusive masses and their infiltration in the Eocene sedimentary-volcanic units, extensive alterations (Sericitic,Argillite,Propylitic,Silicic) have occurred in the region. Mineralization is scattered and vein-veinlet, which occurred in two separate stages, hypogene and supergene. hypogene minerals include pyrite and chalcopyrite minerals, which are accompanied by supergene minerals chalcocite, Covellite, digenite, hematite, limonite and malachite. Volcanic and intrusive series of the region have a common origin and are in the range of high potassium calc-alkaline and shoshonite, and in terms of aluminum saturation index, they are in the range of peraluminous and metaaluminous. Chondrite-normalized multi-element diagrams show LREE enrichment and HREE depletion. The rock units of the region are located in the tectonic environments of the continental arc.
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