TY - JOUR
T1 - Thermal diffusivity, thermal conductivity and heat capacity of serpentine (antigorite) under high pressure
AU - Osako, M.
AU - Yoneda, A.
AU - Ito, E.
AU - Suetsugu, Daisuke
AU - Bina, Craig
AU - Inoue, Toru
AU - Wiens, Douglas
AU - Jellinek, Mark
N1 - Funding Information:
The authors thank K. Yokoyama, M. Shigeoka, and T. Tsujimori for characterization of the sample, and T. Maeda and C. Oka for assistance with the high-pressure experiment. We acknowledge two anonymous reviewers for their helpful comments which improved the manuscript. This work was supported by a Grant in Aid for Scientific Research (No. 17037005 ) in the “Stagnant slab” project sponsored by MEXT. It was also carried out as joint research in the Institute for Study of the Earth's Interior, Okayama University.
PY - 2010/11
Y1 - 2010/11
N2 - Thermal diffusivity and thermal conductivity of serpentine (antigorite) were measured up to 8.5GPa and 800K in the Kawai-type high-pressure apparatus. Antigorite has thermal diffusivity of 0.90×10-6m2s-1 and thermal conductivity of 2.7Wm-1K-1 at 5GPa and 300K, which are much lower than those of olivine. Furthermore, the pressure derivatives of thermal diffusivity and thermal conductivity are significantly smaller than those of olivine. The thermal properties of antigorite obtained in the present study imply existence of a thermal insulating layer in subduction zones. From the simultaneous measurement of both thermal diffusivity and thermal conductivity the heat capacity of antigorite was determined to be ≈1×103Jkg-1K-1, and increased to ≈1.5×103Jkg-1K-1 at ≈800K under high pressure. The heat capacity was nearly independent of pressure, which indicates nearly temperature-independent thermal expansivity of antigorite. Its characteristics also were hypothesized in terms of lattice dynamics of hydrous minerals involving hydrogen atoms and hydroxyl groups.
AB - Thermal diffusivity and thermal conductivity of serpentine (antigorite) were measured up to 8.5GPa and 800K in the Kawai-type high-pressure apparatus. Antigorite has thermal diffusivity of 0.90×10-6m2s-1 and thermal conductivity of 2.7Wm-1K-1 at 5GPa and 300K, which are much lower than those of olivine. Furthermore, the pressure derivatives of thermal diffusivity and thermal conductivity are significantly smaller than those of olivine. The thermal properties of antigorite obtained in the present study imply existence of a thermal insulating layer in subduction zones. From the simultaneous measurement of both thermal diffusivity and thermal conductivity the heat capacity of antigorite was determined to be ≈1×103Jkg-1K-1, and increased to ≈1.5×103Jkg-1K-1 at ≈800K under high pressure. The heat capacity was nearly independent of pressure, which indicates nearly temperature-independent thermal expansivity of antigorite. Its characteristics also were hypothesized in terms of lattice dynamics of hydrous minerals involving hydrogen atoms and hydroxyl groups.
KW - Heat capacity
KW - Serpentine
KW - Subduction zone
KW - Thermal conductivity
KW - Thermal diffusivity
UR - http://www.scopus.com/inward/record.url?scp=78649446987&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78649446987&partnerID=8YFLogxK
U2 - 10.1016/j.pepi.2010.07.005
DO - 10.1016/j.pepi.2010.07.005
M3 - Article
AN - SCOPUS:78649446987
SN - 0031-9201
VL - 183
SP - 229
EP - 233
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
IS - 1-2
ER -