Electrical conductivity of pyrope-rich garnet at high temperature and high pressure

Dai, Lidong; Karato, Shun‐ichiro

doi:10.1016/j.pepi.2009.04.002

Cited by 102 publications

(102 citation statements)

References 19 publications

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“…Moreover, the activation enthalpy of the hydrous augites appears to be independent of water content (Fig. 3), which is consistent with previous reports on other minerals (Dai and Karato, 2009;Huang et al, 2005;Romano et al, 2009;Wang et al, 2006;Yang et al, 2011;Yoshino et al, 2009). The exponent r of 0.94 ± 0.08 is similar to the value of 1.13 ± 0.05 reported for hydrous lower crustal clinopyroxene by Yang et al (2011) (Table 1).…”

Section: Comparison With Previous Studiessupporting

confidence: 91%

“…3), but the activation enthalpies between them are very close, e.g., ~70 kJ/mol (Table 1). The activation enthalpies of the hydrous augites are smaller than those of the dry ones, resembling available results for other silicates (Dai and Karato, 2009;Huang et al, 2005;Romano et al, 2009;Wang et al, 2006;Yang et al, 2011;Yoshino et al, 2009). Moreover, the activation enthalpy of the hydrous augites appears to be independent of water content (Fig.…”

Section: Comparison With Previous Studiessupporting

confidence: 82%

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Fe3+-rich augite and high electrical conductivity in the deep lithosphere

Yang

McCammon

2012

Geology

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Section: Comparison With Previous Studiessupporting

confidence: 91%

Section: Comparison With Previous Studiessupporting

confidence: 82%

Fe3+-rich augite and high electrical conductivity in the deep lithosphere

Yang

McCammon

2012

Geology

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“…Verma, 1960;Sumino and Nishizawa, 1978;Suzuki and Anderson, 1983), electrical conductivity (e.g. Romano et al, 2006;Dai and Karato, 2009), and thermal conductivity (e.g. Kanamori et al, 1968;Giesting and Hofmeister, 2002).…”

Section: Introductionmentioning

confidence: 99%

Elasticity of single-crystal iron-bearing pyrope up to 20 GPa and 750 K

Mao

Lin

et al. 2013

Earth and Planetary Science Letters

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“…Oxygen fugacity not only drives redox reactions, element partitioning, and structural phase transitions, but also controls certain transport electrical properties and rheological properties, especially in minerals such as silicates and oxides in which oxygen vacancies play a major role in these processes. Previous measurements of the electrical conductivity of garnet only considered the effect of chemical composition or water content (Romano et al 2006;Dai and Karato 2009c). Recently, a novel technique has been established to control oxygen fugacity during high-pressure conductivity measurements using the Kawai-1000t multi-anvil apparatus at Yale University (USA) and using the YJ-3000t equipment at the Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China Dai and Karato 2009a).…”

Section: Introductionmentioning

confidence: 99%

The effect of chemical composition and oxygen fugacity on the electrical conductivity of dry and hydrous garnet at high temperatures and pressures

Dai

et al. 2011

Contrib Mineral Petrol

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The in situ electrical conductivity of hydrous garnet samples (Py 20 Alm 76 Grs 4 -Py 73 Alm 14 Grs 13 ) was determined at pressures of 1.0-4.0 GPa and temperatures of 873-1273 K in the YJ-3000t apparatus using a Solartron-1260 impedance/gain-phase analyzer for various chemical compositions and oxygen fugacities. The oxygen fugacity was controlled by five solid-state oxygen buffers ). Experimental results indicate that within a frequency range from 10 -2 to 10 6 Hz, electrical conductivity is strongly dependent on signal frequency. Electrical conductivity shows an Arrhenius increase with temperature. At 2.0 GPa, the electrical conductivity of anhydrous garnet single crystals with various chemical compositions (Py 20 Alm 76 Grs 4 , Py 30 Alm 67 Grs 3 , Py 56 Alm 43 Grs 1 , and Py 73 Alm 14 Grs 13 ) decreases with increasing pyrope component (Py). With increasing oxygen fugacity, the electrical conductivity of dry Py 73 Alm 14 Grs 13 garnet single crystal shows an increase, whereas that of a hydrous sample with 465 ppm water shows a decrease, both following a power law (exponents of 0.061 and -0.071, respectively). With increasing pressure, the electrical conductivity of this hydrous garnet increases, along with the pre-exponential factors, and the activation energy and activation volume of hydrous samples are 0.7731 ± 0.0041 eV and -1.4 ± 0.15 cm 3 /mol, respectively. The results show that small hopping polarons Fe Á Mg andprotons (H Á ) are the dominant conduction mechanisms for dry and wet garnet single crystals, respectively. Based on these results and the effective medium theory, we established the electrical conductivity of an eclogite model with different mineral contents at high temperatures and high pressures, thereby providing constraints on the inversion of field magnetotelluric sounding results in future studies.

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Electrical conductivity of pyrope-rich garnet at high temperature and high pressure

Cited by 102 publications

References 19 publications

Fe3+-rich augite and high electrical conductivity in the deep lithosphere

Fe3+-rich augite and high electrical conductivity in the deep lithosphere

Elasticity of single-crystal iron-bearing pyrope up to 20 GPa and 750 K

The effect of chemical composition and oxygen fugacity on the electrical conductivity of dry and hydrous garnet at high temperatures and pressures

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