Electrical conductivity of olivine at high pressure and under controlled oxygen fugacity

Duba, A.; Heard, H.C.; Schock, R.N.

doi:10.1029/jb079i011p01667

Cited by 166 publications

(85 citation statements)

References 22 publications

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“…STACEY'S (1969) estimates were for the average convecting-model Earth. Although slightly different C and D would be obtained with other temperature profiles, these values appear not to be very model dependent and are consistent with the expected properties of olivine (DuBA et al, 1974). The clustering of the 1965 conductivity values at specific levels seems to match the best estimates of density layering that was obtained from the seismic data.…”

Section: Discussionsupporting

confidence: 66%

Conductivity of the subcontinental upper mantle: an analysis using quiet-day geomagnetic records of North America.

Campbell

Anderssen

1983

J. geomagn. geoelec

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Electrical conductivity properties of the upper mantle for a North American sector of the Earth have been determined using the 24-, 12-, 8-, and 6-hr spectral components of the quiet-day geomagnetic field variations. Spherical harmonic coefficients obtained from an analysis of the three components of the quiet daily variation (Sq) field for the solar-quiet year of 1965 were applied to a modeling procedure that was modified from SCHMUCKER'S (1970) publication. From depths of about 140 km to about 540 km, the conductivity, 6(ohm-meter) -1, may be represented by where d is the depth in kilometers.Small perturbations of conductivity indicating some layering at 140 to 220, 220 to 400, and 400 to 600 km correspond to the similar behavior of the Earth's density in these regions. From temperature-depth models we infer that the multiphase bulk properties of the expected silicates in these regions behave approximately as where T is the temperature in degrees kelvin. The constants of this equation do not seem to be very model dependent.

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Section: Discussionsupporting

confidence: 66%

Conductivity of the subcontinental upper mantle: an analysis using quiet-day geomagnetic records of North America.

Campbell

Anderssen

1983

J. geomagn. geoelec

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“…The higher-pressure 0 and •y phases probably conduct the same way (indeed, it has been hypothesized by PEYRONNEAU and POIRIER (1989) that silicate perovskite conducts this way also), and so the conductivities predicted by the lower-pressure model may well be correct to first order. The effect of pressure on olivine conductivity is probably small (DUBA et al, 1974).…”

Section: Conversion Of Conductivity To Temperaturementioning

confidence: 99%

Constraints on Mantle Electrical Conductivity from Field and Laboratory Measurements.

Constable

1993

J. geomagn. geoelec

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A global geomagnetic response function, sensitive to the average radial electrical conductivity structure of Earth's mantle to depths of at least 1800 km, is obtained by averaging published, single-site response functions estimated at periods between 105-107 seconds from magnetic observatory records. Although the error bars on the global response function are mostly smaller than 5%, Parker's D+ algorithm demonstrates compatibility with a one-dimensional model, both in terms of magnitude and distribution of data residuals. Smooth models in the sense of minimum first and second derivatives of log(conductivity) with log(depth) show conductivities increasing from 0.01 S/m 200 km deep to 2 S/m at a depth of 2000 km. Geotherms inferred from these conductivities using a laboratory model for the temperature dependence of dry subsolidus olivine yield temperatures of 1750'C at a depth of 410 km; hotter than the 1400'C for this depth inferred from published values for the equilibrium boundary of the olivine a --f a+,3 transition. Inclusion of a sharp jump in conductivity at the 660 km seismic discontinuity lowers the electrogeotherm to 1600'C at 410 km, while an explicit penalty on the conductivity at this depth demonstrates that a temperature of 1400° is compatible with the global response function if 1000 S of additional conductance is included above 200 km. The electrical conductivity below the jump at 660 km is 1 S/m increasing to 2 S/m at 2000 km, in excellent agreement with recent diamond anvil measurements of lower mantle materials. Extension of the global response to higher frequencies is possible using data from magnetic satellites. One such study is shown to be in general agreement with the averaged response.

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“…Thus, as the principal interconnected phases, their conductivities are likely to dominate bulk conductivity of the upper mantle. Electrical properties within the olivine-wadsleyite-ringwoodite -perovskite + magnesiowtistite compositional system have been determined at mantle pressures and/or temperatures [Duba et al, 1974 Xu et al, 1998aXu et al, , 1998b. A laboratory-based conductivity profile has been constructed according to those data [Xu et al, 1998a[Xu et al, , 1998b.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity of orthopyroxene and its high pressure phases

Shankland

1999

Geophysical Research Letters

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Abstract. Electrical conductivity of orthopyroxene, clinopyroxene, and ilmenite +gamet with the same starting material San Carlos orthopyroxene (Mg0.92Fe0.08)SiO 3 containing 2.89 % A120 3 by weight were measured within their respective stability fields in a multi-anvil press. In the formula for conductivity ty = ty 0 exp(-AH/•T), pre-exponential factors ty 0 of orthopyroxene, clinopyroxene, and ilmenite +gamet are 5248, 1778, 2239 S/m, respectively, and the activation enthalpies are 1.80, 1.87 and 1.66 eV, respectively. These results are required for defining a laboratory-based conductivity-depth profile of the upper mantle.

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Electrical conductivity of olivine at high pressure and under controlled oxygen fugacity

Cited by 166 publications

References 22 publications

Conductivity of the subcontinental upper mantle: an analysis using quiet-day geomagnetic records of North America.

Conductivity of the subcontinental upper mantle: an analysis using quiet-day geomagnetic records of North America.

Constraints on Mantle Electrical Conductivity from Field and Laboratory Measurements.

Electrical conductivity of orthopyroxene and its high pressure phases

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