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- W20907560 abstract "For mantle regions of anomalously high electrical conductivity (0.1 to 1.0 S/m) the conductivity is modeled by effective medium theory as a basalt melt fraction within a mainly olivine matrix. In order for the highly conducting melt to affect the bulk conductivity it must form interconnections; thus the very existence of mantle conductivity anomalies constitutes evidence for such interconnections. Petrological data on the partial melting of peridotite strongly constrain the range of temperatures and melt fractions that can be used to yield an observed electrical conductivity. For example, a conductivity of 0.2 S/m at 15 kb (approximately 50 km depth) corresponds to a temperature of 1260/sup 0/C and a melt fraction of 0.18 if the water content is 0.1 percent. Thus from measured conductivities alone it is possible to estimate temperature and the degree of partial melting in rift zones, volcanic belts, geothermal areas, and beneath the oceans where mantle conductivity anomalies have been found. Accuracy depends on accuracy of field measurements, properties of the melt phase, and water content; the model is insensitive to conductivity in the crystalline phase and to oxygen fugacity." @default.
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- W20907560 date "1976-12-01" @default.
- W20907560 modified "2023-09-22" @default.
- W20907560 title "Partial melt in the mantle: evidence from electrical conductivity" @default.
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