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Phase diagram of iron, revised-core temperatures

Ahrens, Thomas J. and Holland, Kathleen G. and Chen, George Q. (2002) Phase diagram of iron, revised-core temperatures. Geophysical Research Letters, 29 (7). Art. No. 1150. ISSN 0094-8276. doi:10.1029/2001GL014350.

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Shock-wave experiments on iron preheated to 1573 K from 14 to 73 GPa, yield sound velocities of the γ- and liquid-phases. Melting is observed in the highest pressure (∼71 ± 2 GPa) experiments at calculated shock temperatures of 2775 ± 160 K. This single crossing of the γ-liquid boundary agrees with the γ-iron melting line of Boehler [1993], Saxena et al. [1993], and Jephcoat and Besedin [1997]. This γ-iron melting curve is ∼300°C lower than that of Shen et al. [1998] at 80 GPa. In agreement with Brown [2001] the discrepancy between the diamond cell melting data and the iron shock temperatures require the occurrence of yet another sub-solidus phase along the principal Hugoniot at ∼200 GPa. This would reconcile the static and dynamic data for iron's melting curve. Upward pressure and temperature extrapolation of the γ-iron melting curve to 330 GPa yields 5300 ± 400 K for the inner core-outer core boundary temperature.

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Additional Information:© 2002 by the American Geophysical Union. Received 7 November 2001; accepted 6 December 2001; published 13 April 2002. Research supported by NSF. We thank T. S. Duffy for a preprint, and E. Gelle and M. Long for technical assistance. The helpful comments of reviewers R. Boehler and S. Saxena, as well as a third reviewer of a revised version are greatly appreciated. Contribution #8576, Division of Geological and Planetary Sciences.
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Caltech Division of Geological and Planetary Sciences8576
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Official Citation:Ahrens, T. J., K. G. Holland, and G. Q. Chen, Phase diagram of iron, revised-core temperatures, Geophys. Res. Lett., 29(7), doi:10.1029/2001GL014350.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50680
Deposited By: Tony Diaz
Deposited On:22 Oct 2014 19:07
Last Modified:10 Nov 2021 18:59

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