Electrical conductivity of molten basalt and andesite to 25 kilobars pressure

geophysical significance and implications for charge transport and melt structure.

James Tyburczy, H. S. Waff

Research output: Contribution to journalArticle

127 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)2413-2430
Number of pages18
JournalJournal of Geophysical Research
Volume88
Issue numberB3
StatePublished - 1983
Externally publishedYes

Fingerprint

andesite
basalt
electrical conductivity
Molten materials
Charge transfer
melt
electrical resistivity
plots
tholeiite
lakes
craters
pressure dependence
atmospheric pressure
discontinuity
crater lake
activation
rocks
slopes
Atmospheric pressure
Lakes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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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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T1 - Electrical conductivity of molten basalt and andesite to 25 kilobars pressure

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AU - Tyburczy, James

AU - Waff, H. S.

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Y1 - 1983

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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