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Russian Geology and Geophysics

2002 year, number 10

VARIATIONS IN ELECTRICAL RESISTANCE OF DUNITES AS A FUNCTION OF TEMPERATURE AND SERPENTINIZATION DEGREE (by the example of the Urals)

V. V. Bakhterev and L. D. Bulykin
Keywords: serpentinization of dunites, temperature, electrical resistance, activation energy
Pages: 960-967

Abstract

Electrical-resistance measurements, thin-section, chemical, thermal differential, and thermal gravity analyses were applied to dunites of different serpentinization degrees (from 0 to 100%, at 1-4% interval) from the Nizhnii Tagil dunite-clinopyroxenite massif in the Ural PGE-bearing belt (Solovieva Gora). The obtained functions show the temperature-dependent behavior of electrical resistance in the range of 20 to 800oC and a dependence of conductance activation energy on the degree of early serpentinization of dunites. The serpentinization-dependent activation energy shows no resistance dependence at normal temperature but is proportional to resistance temperature coefficient lgR0 (R0 is equal to resistance at 1/R0) in the temperature ranges of impurity-bearing (150-300 oC) and pure (350-600 oC) serpentinites.