Akhtarchi deposit with carbonated host: geology, mineralography and electron microprobe (EPMA) studies
Subject Areas :Mohammadamin Naziri 1 , Iraj Rassa 2 , Mohammad yazdi 3
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Keywords: Akhtarchi, Sanandaj-Sirjan zone, Carlin type, Carbonated host rock, Gold,
Abstract :
The Akhtarchi gold deposit with carbonate host is located in southeast Mahallat, Markazi province, and Sanandaj-Sirjan structural zone. Host rock includes impure carbonated rocks with Permian age which is affected by dissolution (decarbonatization) and brecciation in mineralized zones. Mineralization is controlled structurally and there is spatial relation between faults and mineralization. The most important alterations include silicification, hematization, dolomitization, decarbonatization and argillic. Gold occurrence is seen as three forms, associated with iron oxides, siliceous (jasperoid) and placer. There are five types of mineralized veins in the area including gold bearing iron oxide, gold bearing siliceous -iron oxide, copper bearing siliceous-iron oxide, siliceous-pyritic and milky quartz veins. Microscopic studies and microprobe analyses show that gold exists in this deposit as microscopic grains inside iron oxides and as submicroscopic in iron oxides, iron-manganese oxides, carbonates, copper bearing secondary minerals and sulfides. Based on geological, structural, alteration, mineralography and microprobe studies, properties of Akhtarchi deposit have the most similarity with Carlin type gold deposit.
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