Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ep%26s...59..645f&link_type=abstract
Earth, Planets and Space, Volume 59, p. 645-648.
Physics
4
Scientific paper
Hydrous minerals are crucial because their occurrence is associated with seismic activity through the dehydration process that occurs in the earth's crust and/or mantle. We have developed a technique to observe the dehydration reaction of brucite using electrical conductivity variation under sealed conditions. The electrical conductivity of brucite was measured as a function of temperature. The confining pressure for the measurements was 1 GPa, which represents that of the lower crust. Two types of remarkable electrical conductivity variation were observed. During the first heating, the conductivity of the sample showed a linear variation below 700 K, as was expected from the Arrhenius equation. Once the temperature was increased to near the dehydration boundary, the sample showed a high conductivity. Even though only a small amount of H2O was formed after dehydration, bulk conductivity of the sample varied greatly, presumably caused by a combination of the presence of coexisting solid and fluid phases and a mixed electronic and ionic conduction mechanism operating in the sample.
Fuji-ta Kiyoshi
Ichiki Masahiro
Katsura Takashi
Matsuzaki Teiichiro
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