Abstract
Minerals of the alunite supergroup (alunite, plumbogummite, hinsdalite, crandallite) were found in ore diagenites of the Yaman-Kasy massive sulfde deposit, South Urals. Numerous spheroids (up to 20 μm) of these minerals with radial and zoned structure and acicular aggregates in assemblage with quartz, chlorite, and hematite are found in chalcopyrite, which replaced fragments of pyrite, marcasite and sphalerite during diagenesis, or in quartz-chlorite matrix. The minerals contain (wt. %): 7.16–19.81 P2O5, 0.93–8.77 CaO, 1.15–33.05 PbO, 1.21– 9.94 Fe2O3, 0.05–3.38 BaO and 0.2–2.51 ZnO. The Pb (plumbogummite, hinsdalite) and Ca (crandallite) members of the alunite supergroup are dominant in hematite-bearing diagenites, whereas K member (alunite) occurs in sphalerite-chalcopyrite diagenites associated with chlo-ritolites. The fnds of these minerals in products of submarine supergenesis of massive sulfde ores expand our knowledge on their areas of occurrences. Figures 7, Tables 1, References 19.
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