Mineral transformations of hyaloclastite during lithogenesis in massive sulfide bearing regions of Urals
N.R. Ayupova, V.V. Maslennikov, V.A. Kotlyarov, N.K. Nikandrova
The features of the submarine transformations from primary hyaloclastites to oxide-ferruginous rocks of the Urals massive sulfde deposits are identifed. These processes are accompanied by formation of smectite and Si-Fe phases transformed into chlorite-hematite-quartz association during lithogenesis. The formation of Ti, Mn, Ca, K, P, and REE authigenic minerals is a result of leaching of these elements from hyaloclastites. The presence of carbonates or biogenic material intensifes the processes of formation of authigenic mineralization. The low to moderate temperatures 119–221 °C of Fe-Mg chlorite formation (according to chlorite geothermometer) indicate alteration of primary hyaloclastites in the course of anadiagenesis.
Figures 4. Tables 3. References 46.
Key words: massive sulfde deposits, oxide-ferruginous, hyaloclasts, iron-magnesium chlorite, Mössbauer spectrum, chlorite geothermometer.
МINERALOGY № 2 2015