In cooperation with the Iranian Nuclear Society

Document Type : Research Paper

Authors

1 Nuclear fuel cycle research school, Nuclear science and technology research institute.

2 Nuclear Fuel Cycle Research School,- Nuclear Science and Technology Research Institute

Abstract

Talmessi deposit is located about 30 km west of Anarak city and 200 km east of Isfahan, in the Anark district in the structural zone of Central Iran. The main host rock of mineralization in Talmessi deposit is andesite to andesi- basalt. Mineralogical studies by field emission electron microscope indicate the presence of at least four stages of mineralization in Talmessi deposit. The first stage includes fissure-filling copper sulphide mineralization related to Eocene volcanism. The second stage is in the form of nickel-copper vein arsenide mineralization and the main mineral in this stage is nickeline with minor amounts of chalcocite and pyrite. In the third stage, nickel, cobalt and copper arsenides (domeykite, rammelsbergite, safflorite, skutterudite, koutekite, kutinaite) and minor amounts of copper sulfide (chalcocite) were deposited along with uranium minerals including uraninite, brannerite and coffinite. In the last stage, with the influx of oxidant fluids, the minerals of the previous stages have been replaced by nickel arsenates (such as xanthiosite) and copper arsenates and secondary uranium minerals. During this stage, primary uranium minerals are converted into secondary uranium minerals such as uranium arsenate (chadwickite), copper-uranium arsenate (cuprosklodowskite, zeunerite), calcium-uranium silicate (uranophane), uranium carbonate (rutherfordine), calcium-uranium carbonate (sharpite) and Calcium-uranium phosphate (autunite).

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