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Russian Geology and Geophysics

2012 year, number 2

HIGH-TEMPERATURE CONDUCTIVITY OF MAGNETITE ORES IN RELATION TO THEIR GENESIS AND MINERAL COMPOSITION ( by the example of the Goroblagodatskoe skarn-magnetite deposit )

V.V. Bakhtereva and A.Zh. Kuznetsovb
a Institute of Geophysics, Uralian Branch of the Russian Academy of Sciences, ul. Amundsena 100, Yekaterinburg, 620016, Russia
b Uralian State Mining University, ul. Kuibysheva 30, Yekaterinburg, 620144, Russia
Keywords: Electrical resistance, high temperature, activation energy, magnetite, genesis, types of ores
Pages: 209-213

Abstract

Samples of magnetite ores of different parageneses and mineral compositions from the Goroblagodatskoe skarn-magnetite deposit were studied by physical and mineralogo-petrographic methods. Electrical-resistance curves were obtained for an ore containing 80-90% magnetite for the temperature range 20-800 ?C. Three groups of samples were recognized according to the pattern of temperature curves and electrical resistance: sulfide-free, sulfide-containing (pyrrhotite), and variolitic ores.
The parameters of high-temperature conductivity (activation energy E 0 and coefficient of electrical resistance lgR0) have been determined. A linear relationship between E 0 and lgR0 (lgR0 = a - bE 0) has been established for magnetite ores of all mineral types. The coefficient a varies from 1.92 to 4.80 depending on the type and mineral composition of magnetite ores. The coefficient b is nearly constant for all studied samples, 6.65. The figurative points of the samples in the E 0 - lgR0 coordinates lie in the field bounded by the straight lines lgR0 = 4.80 - 6.65 E 0 and lgR0 = 1.92 - 6.65 E 0.
The samples of magnetite ores of the skarn and hydrosilicate paragenesis with visible pyrrhotite inclusions and samples of variolitic ores form an individual group in the above field. Within the group, the ores are also subdivided into garnet-magnetite (skarn paragenesis), epidote-chlorite-magnetite (hydrosilicate paragenesis), pyroxene-magnetite, and orthoclase-magnetite (variolitic ores).