High-temperature electrical conductivity of chromite ores from the Alapaevsky hyperbasite massif, Middle Urals, as a function of their composition and metamorphism

Research subject. Chromite ores and massive chromitites with alumina (low chromium) chrome spinelide (the Podennoye deposit deposit) chromite high-chromium (Kurmanovskoye of the Alapaevsky hyperbasite massif. Materials methods. Samples collected during field research were studied in transparent sections using chemical analysis electrical methods (electrical conductivity, dielectric losses). Results. The temperature dependences resistance losses range 20‒800°C obtained. parameters lgRₒ Eₒ determined, inverse linear relationship bet-ween them was revealed. for three groups samples found to differ depending on degree metamorphic changes. It established that an increase metamorphism leads a decrease Eₒ. For ore from deposit, vary 0.61 0.96 2.5 –0.41, respectively. In Kurmanovskoye field, these 0.81 1.35 0.95 –2.8, varies 0.21 0.41, while –0.08 1.67. this case, coefficients b are different each group samples. some samples, composition six (two group), content ferrous trivalent iron oxides original sample duplicate after calcination at up 800 °C determined. Relative change ratio initial (FeO/Fe 2 O 3 )* )** H = [(FeO/Fe )*/(FeO/Fe )**] compared position maximum scale. coordinates H–T, °C, changes, occupy certain place. Conclusions. study indicates potential obtained information be used as petrogenetic indicators deposits simultaneous assessment