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Methodological re-evaluation of the electrical conductivity of silicate melts
-
A. Pommier
,
F. Gaillard
Published/Copyright:
April 2, 2015
Abstract
Electrical impedance measurements in the laboratory on silicate melts are used to interpret magnetotelluric anomalies. On the basis of 2- and 4-electrode measurements, we show that the influence of the electrodes of the 2-electrode system on the measured resistivity can be of significant importance for low-resistivity melts and increases with temperature. At 1400 °C, the resistivity of very conductive melts measured with two electrodes can reach six times the resistivity value measured with four electrodes. A short-circuit experiment is needed to correct the 2-electrode data. Electrodes contribution is also estimated for samples from other studies, for which the resistance of the electrical cell can be as high as the resistance of the sample. A correction of the resistivity data from the literature is proposed and values of the corresponding Arrhenian parameters are recommended.
Received: 2009-6-10
Accepted: 2009-9-28
Published Online: 2015-4-2
Published in Print: 2010-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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