Variations in electrical resistance of dunites as a function of temperature and serpentinization degree (example of Urals)
Variations in electrical resistance of dunites as a function of temperature and serpentinization degree (example of Urals)
Russian Geology and Geophysics (October 2002) 43 (10): 910-918
- activation energy
- Central Urals
- chrome spinel
- Commonwealth of Independent States
- cores
- dehydration
- dunite
- electrical conductivity
- igneous rocks
- instruments
- laboratory studies
- lizardite
- magnetite
- metal ores
- metals
- metasomatism
- mineral composition
- mineral exploration
- oxides
- peridotites
- petrography
- platinum group
- platinum ores
- plutonic rocks
- resistivity
- Russian Federation
- serpentine group
- serpentinization
- sheet silicates
- silicates
- Sverdlovsk Russian Federation
- temperature
- thermal analysis data
- thin sections
- ultramafics
- Urals
- Nizhny Tagil Russian Federation
- Solovieva Gora
Electrical resistance measurements, thin-section, chemical, thermal differential, and thermal gravimetrical 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 temperature-dependent behavior of electrical resistance in the range of 20 to 800 degrees C and a dependence of the activation energy of ions on the degree of early serpentinization of dunites. The serpentinization-dependent activation energy shows no resistance dependence at room temperature but is proportional to resistance temperature coefficient lg R0 (R0 is equal to resistance at 1 /T-->0, T is temperature in K) in the temperature ranges of impurity-bearing (150-300 degrees C) and pure (350-600 degrees C) serpentinites.
