HR: 0830h
AN: GP11A-0249    [PDF]
TI: Electrical Conductivity Measurement of Granulite Under Mid to Lower Crustal Pressure-Temperature Conditions
AU: * Fuji-ta, K
EM: fuji-ta@kobe-u.ac.jp
AF: Department of Earth and Planetary Sciences, Kobe University, 1-1 Rokkodai, Nada-Ku, Kobe, 657-8501 Japan
AU: Katsura, T
AF: Institute for Study of the Earth_fs Interior, Okayama University, 827 Yamada, Misasa, 682-0193 Japan
AU: Tainosho, Y
AF: Faculty of Human Development, Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe, 657-8501 Japan
AB: We have developed a technique to measure electrical conductivity of crustal rocks with relatively low conductivity and complicated mineral components in order to compare with results given by Magneto-Telluric (MT) measurements. A granulite from Hidaka Metamorphic Belt (HMB) in Hokkaido, Japan at high temperature and pressure conditions was obtained. The granulite sample was ground and sintered under the conditions similar to those of mid to lower crust. We have observed smooth and reversible change of conductivity with temperature up to about 900 K at 1 GPa. Through the qualitative and quantitative evaluations using Electron Probe Micro Analysis (EPMA), microstructures of the sintered sample were inspected. This inspection is essential to confirm the sample was not affected by chemical interaction of minerals. We also examined the role of accessory minerals in the rock, and the mechanisms of electrical conductivity paths in _gdry_h or _gbasic_h rocks should be reconsidered. Finally, results from electrical conductivity measurements were consistent with the electrical conductivity structures suggested by the former MT data analysis.
UR: http://www.kobe-u.ac.jp/marine/member/fujita
DE: 0600 ELECTROMAGNETICS
DE: 1212 Earth's interior--composition and state (8105)
DE: 1645 Solid Earth
DE: 3914 Electrical properties
DE: 5109 Magnetic and electrical properties
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting