کانی‌شناسی اورانیم در کانسار تالمسی، ناحیه انارک، ایران مرکزی

The Talmessi deposit is located approximately 30 km west of Anarak city and 200 km east of Isfahan, in the Anark district within the structural zone of Central Iran. The main host rock for mineralization in the Talmessi deposit is andesite to andesite-basalt. Mineralogical studies conducted using a field emission electron microscope indicate the presence of at least four stages of mineralization in the Talmessi deposit. The first stage involves fissure-filling copper sulphide mineralization, which is related to Eocene volcanism. The second stage presents itself in the form of nickel-copper vein arsenide mineralization, with the primary mineral being nickeline, accompanied by minor amounts of chalcocite and pyrite. In the third stage, nickel, cobalt, and copper arsenides (such as domeykite, rammelsbergite, safflorite, skutterudite, koutekite, and kutinaite) are deposited, along with minor amounts of copper sulfide (chalcocite), as well as uranium minerals including uraninite, brannerite, and coffinite. During the final stage, as oxidant fluids infiltrate, the minerals from the previous stages are replaced by nickel arsenates (such as xanthiosite), copper arsenates, and secondary uranium minerals. Primary uranium minerals undergo a transformation 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).