Porphyry Deposits of the South Urals: Rhenium Distribution

Most of porphyry deposits and occurrences of the Urals are confined to three main N-S trending volcanic belts (megazones), i.e. the Tagyl−Magnitogorsk, East-Uralian and Trans-Uralian megazones (Fig. 1). The westernmost Magnitogorsk megazone consists mostly of a series of Silurian to late Devonian oceanic island arcs, which host Au-Cu and Cu porphyry deposits (along with numerous VHMS deposits). They are associated with diorite, quartz-diorite, and locally gabbrodiorite porphyries, e.g. the Devonian Salavat and Late Devonian Voznesenskoe Cu porphyry deposits and the Late Devonian – Early Carboniferous Yubileinoe Au porphyry deposit. The East Uralian volcanic megazone comprises fragments of volcanic arcs of Late Devonian to Early Carboniferous age. Cu and Mo-Cu porphyry deposits are mostly related to diorite and quartz diorites. These are the Late Devonian to Early Carboniferous Birgilda, Tomino, and Kalinovskoe deposit, and the less studied Takhtalym and Zeleny Dol Cu porphyry occurrences. On the boarder between Eastand Trans-Uralian megazones the Carboniferous Mikheevskoe (Mo)-Cu deposit and Tarutino skarn-porphyry occurrence are located. The Trans-Uralian megazone includes the Valerianovka Andean-type arc which hosts several Carboniferous Cu porphyry deposits including the Benkala deposit in Kazakhstan. Most porphyry Cu deposits of the Urals are related to Olga Yu. PLOTINSKAYA, Anatoly I. GRABEZHEV, Reimar SELTMANN, 2014. Porphyry Deposits of the South Urals: Rhenium Distribution. Acta Geologica Sinica (English Edition), 88(supp. 2): 584-586.