TY - JOUR
T1 - Simultaneous measurements of thermal conductivity and thermal diffusivity for garnet and olivine under high pressure
AU - Osako, Masahiro
AU - Ito, Eiji
AU - Yoneda, Akira
N1 - Funding Information:
We thank T. Katsura for his help in the high-pressure experiment, and K. Yokoyama for EPMA analyses and helpful comments on the present samples. We also thank anonymous reviewers for their helpful comments to improve the manuscript. This work was partly supported by a grant-in aid for Scientific Research (No. 14540401) from JSPS, and was carried out by joint research in the Institute for Study of the Earth’s Interior, Okayama University.
PY - 2004/6/15
Y1 - 2004/6/15
N2 - Thermal conductivity λ and thermal diffusivity κ have been measured simultaneously for garnet (Al73Py25Gr1Sp1) and olivine (Fo93Fa7) single crystals up to 8.3 GPa and 1100 K by using a pulse heating method. Anisotropy of thermal conduction is investigated along the three crystallographic axes, [1 0 0] [0 1 0], and [0 0 1] in olivine. The pressure dependence of κ, or dln κ /d P, is determined to be 0.03-0.04 GPa-1 for the three crystallographic direction in olivine and 0.03 GPa-1 for garnet, while dln λ /d P is determined to be ∼0.04 GPa-1 for olivine and 0.03 GPa-1 for garnet. The anisotropy in thermal diffusivity or thermal conductivity of olivine is clearly observed in the present experimental range of pressure and temperature. It is likely that the anisotropy in thermal conduction would be maintained throughout the olivine stability field in the mantle down to 410 km depth. Heat capacities of olivine and garnet are calculated from the present κ and λ. Both the present heat capacities of olivine and garnet are consistent with the previously reported values within 5%. Those obtained for the three crystallographic direction in olivine are also consistent with each other within 6%. Further, the effect of basalt-eclogite transition on heat transportation is discussed based on the present results for garnet. It implies that the eclogite layer of the slab transmits thermal energy more effectively than the upper basaltic layer.
AB - Thermal conductivity λ and thermal diffusivity κ have been measured simultaneously for garnet (Al73Py25Gr1Sp1) and olivine (Fo93Fa7) single crystals up to 8.3 GPa and 1100 K by using a pulse heating method. Anisotropy of thermal conduction is investigated along the three crystallographic axes, [1 0 0] [0 1 0], and [0 0 1] in olivine. The pressure dependence of κ, or dln κ /d P, is determined to be 0.03-0.04 GPa-1 for the three crystallographic direction in olivine and 0.03 GPa-1 for garnet, while dln λ /d P is determined to be ∼0.04 GPa-1 for olivine and 0.03 GPa-1 for garnet. The anisotropy in thermal diffusivity or thermal conductivity of olivine is clearly observed in the present experimental range of pressure and temperature. It is likely that the anisotropy in thermal conduction would be maintained throughout the olivine stability field in the mantle down to 410 km depth. Heat capacities of olivine and garnet are calculated from the present κ and λ. Both the present heat capacities of olivine and garnet are consistent with the previously reported values within 5%. Those obtained for the three crystallographic direction in olivine are also consistent with each other within 6%. Further, the effect of basalt-eclogite transition on heat transportation is discussed based on the present results for garnet. It implies that the eclogite layer of the slab transmits thermal energy more effectively than the upper basaltic layer.
KW - Anisotropy
KW - Garnet
KW - Heat capacity
KW - High pressure
KW - Olivine
KW - Thermal conductivity
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U2 - 10.1016/j.pepi.2003.10.010
DO - 10.1016/j.pepi.2003.10.010
M3 - Article
AN - SCOPUS:2442459686
VL - 143
SP - 311
EP - 320
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
IS - 1-2
ER -