Electrical conductivity of molten basalt and andesite to 25 kilobars pressure: geophysical significance and implications for charge transport and melt structure.

J. A. Tyburczy; H. S. Waff

doi:10.1029/JB088iB03p02413

Electrical conductivity of molten basalt and andesite to 25 kilobars pressure: geophysical significance and implications for charge transport and melt structure.

J. A. Tyburczy, H. S. Waff

Research output: Contribution to journal › Article › peer-review

137 Scopus citations

Abstract

Electrical conductivities of molten Hawaiian tholeiite and Crater Lake andesite were measured between 1200oC and 1400oC at atmospheric pressure and at pressures up to 17 and 25 kbar, respectively. Isobaric plots of log sigma versus 1/T (sigma is electrical conductivity) are linear, with the exception of the zero pressure tholeiite melt data. Conductivities decrease with increasing pressure in both melts, with the andesitic melt exhibiting a greater pressure dependence. Between 5 and 10 kbar abrupt decreases in the slopes of isothermal log sigma versus P plots (ie. decreases in activation volume) are observed for both rock melts. This discontinuity probably reflects changes in melt structure.-from Authors

Original language	English (US)
Pages (from-to)	2413-2430
Number of pages	18
Journal	Journal of geophysical research
Volume	88
Issue number	B3
DOIs	https://doi.org/10.1029/JB088iB03p02413
State	Published - Jan 1 1983
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Forestry
Oceanography
Aquatic Science
Ecology
Water Science and Technology
Soil Science
Geochemistry and Petrology
Earth-Surface Processes
Atmospheric Science
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science
Palaeontology

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abstract = "Electrical conductivities of molten Hawaiian tholeiite and Crater Lake andesite were measured between 1200oC and 1400oC at atmospheric pressure and at pressures up to 17 and 25 kbar, respectively. Isobaric plots of log sigma versus 1/T (sigma is electrical conductivity) are linear, with the exception of the zero pressure tholeiite melt data. Conductivities decrease with increasing pressure in both melts, with the andesitic melt exhibiting a greater pressure dependence. Between 5 and 10 kbar abrupt decreases in the slopes of isothermal log sigma versus P plots (ie. decreases in activation volume) are observed for both rock melts. This discontinuity probably reflects changes in melt structure.-from Authors",

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PY - 1983/1/1

Y1 - 1983/1/1

N2 - Electrical conductivities of molten Hawaiian tholeiite and Crater Lake andesite were measured between 1200oC and 1400oC at atmospheric pressure and at pressures up to 17 and 25 kbar, respectively. Isobaric plots of log sigma versus 1/T (sigma is electrical conductivity) are linear, with the exception of the zero pressure tholeiite melt data. Conductivities decrease with increasing pressure in both melts, with the andesitic melt exhibiting a greater pressure dependence. Between 5 and 10 kbar abrupt decreases in the slopes of isothermal log sigma versus P plots (ie. decreases in activation volume) are observed for both rock melts. This discontinuity probably reflects changes in melt structure.-from Authors

AB - Electrical conductivities of molten Hawaiian tholeiite and Crater Lake andesite were measured between 1200oC and 1400oC at atmospheric pressure and at pressures up to 17 and 25 kbar, respectively. Isobaric plots of log sigma versus 1/T (sigma is electrical conductivity) are linear, with the exception of the zero pressure tholeiite melt data. Conductivities decrease with increasing pressure in both melts, with the andesitic melt exhibiting a greater pressure dependence. Between 5 and 10 kbar abrupt decreases in the slopes of isothermal log sigma versus P plots (ie. decreases in activation volume) are observed for both rock melts. This discontinuity probably reflects changes in melt structure.-from Authors

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Electrical conductivity of molten basalt and andesite to 25 kilobars pressure: geophysical significance and implications for charge transport and melt structure.

Abstract

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