| Original Articles |
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Temperature Coefficient of Sound Velocity of Perovskite-Enstatite and Lateral Thermal Heterogeneity in Earth’s Lower Mantle |
| GONG Zi-Zheng1,2;XIE Hong-Sen1;JING Fu-Qian2;LIU Yong-Gang1,
GUO Jie1;XU Jian1,3
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| 1Material Laboratory of the Earth s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002
2Laboratory for Shock Waves and Detonation Physics Research, Southwest Institute of Fluid Physics, Chengdu 610003
31nstitute of Geosciences, Academia Sinica, Taipei 11529
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| Cite this article: |
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GONG Zi-Zheng, XIE Hong-Sen, JING Fu-Qian et al 2000 Chin. Phys. Lett. 17 218-220 |
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Abstract Using the differences of sound velocity and temperature on the Hugoniot and isoentropic state, the temperature coefficients of sound velocity of perovskite-enstatite under high pressure were obtained. For compressional, shear and bulk wave velocities, their temperature coefficients decrease from 0.386, 0.251, 0.255m/(s.K) at 40 GPa to 0.197, 0.131, 0.162m/(s.K) at 140 GPa, respectively. Extrapolating these to zero pressure results in (∂K/∂T)0 = -0.0279 GPa.K-1, which is consistent very well with the value got by hydrostatic pressure experiment. On the basis of our data, we conclude that the compressional wave velocity anomaly of 0.1-0.2% in the deep lower mantle and 2% in the D" region would imply lateral thermal heterogeneity with amplitude of 53-106K and 1066K in these regions, respectively.
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| Keywords:
62.50.+p
91.35.Ed
65.90.+i
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Published: 01 March 2000
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| PACS: |
62.50.+p
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91.35.Ed
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(Structure of the Earth's interior below the upper mantle)
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65.90.+i
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(Other topics in thermal properties of condensed matter)
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