Petrography, geochemistry, mineralogy and type of mineralization in Rahimabad Cu (Ag) deposit, SW of Ardestan

Document Type : Original Article

Authors

1 همدان - دانشگاه بوعلی سینا- دانشکده علوم پایه- گروه زمین شناسی

2 Ministry of Industry, Mine and Trade, Esfahan

3 Islamic Azad University - South Tehran branch

4 seoul national university

10.22108/ijp.2024.140522.1319

Abstract

The Rahimabad Cu (Ag) deposit is located 21 km to the SW of Ardestān city and 80 km to the NE of Esfahan, in the Urumieh-Dokhtar Magmatic Belt. The most important rock units in the area are Eocene volcano-sedimentary rocks and Dorvejin intrusion.The copper (Ag) mineralization occurs in andesite, basaltic andesite and basaltic lavas with a tonnage of 10 million tons and an average copper grade of 2.86% and silver grade of 40 ppm. These rocks are meta-aluminous and have a calc-alkaline affinity and indicate a subduction-related magmatic arc. The main alterations of the area are silicic, propylitic, argillic, sercitic and zeolitic. The geometry of mineralization is strata-bound and the texture and structure of mineralization is open space filling, disseminated, vein-veinlet and replacement. Based on microscopic and EPMA evidences, the most important Cu and Ag minerals include chalcopyrite, bornite, chalcocite- covellite group minerals, malachite, azurite, acanthite and jalpaite, which are accompanied by magnetite and hematite. Pyrite is mostly observed as a separate mineral in the host rock. Comparison of Rahimabad copper mineralization characteristics, including tectonic setting, host rock, geometry, texture and structure, mineralogy and the paragenetic of Cu minerals and alteration with different types of copper deposits shows that Rahimabad copper deposit has the most similarity and correspondence with manto type copper deposits.

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