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Dislocation melting of iron and the temperature of the inner core boundary, revisited (1993)

Poirier, J.-P. ; Shankland, T. J.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 115 (1993), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: The melting point Tm of iron at conditions of the Earth's inner core boundary (ICB) has been calculated from the dislocation theory of melting in metals. These calculations take into account the effects of pressure at ICB conditions and of possible freezing point depression resulting from dilution of pure iron in the outer core. Monte Carlo calculations have been used to estimate the uncertainties introduced by uncertainty in the geophysical parameters that are used in the calculations. With this approach Tm of pure e-Fe at a pressure of 330 GPa and without freezing point depression is 6160 ± 250 K, and 6110 K for a 1000 K freezing-point depression, Tm of pure y-Fe is not significantly different; these values agree well with shock-wave determinations of Tm. The estimated temperature of the ICB is lower by the freezing point depression, perhaps by 500-1000 K.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb05594.x

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Electrical conductivity of the Earth's lower mantle (1993)

Shankland, T. J. ; Peyronneau, J. ; Poirier, J.-P.

[s.l.] : Nature Publishing Group

Nature 366 (1993), S. 453-455

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] We used three starting materials from San Carlos, Arizona to represent possible lower-mantle compositions. The samples were an enstatite (Mgj -x, Fex)SiO3 with an iron content of 11 atom% (x - 0.11) and two olivines (Mgi -x, Fex)2SiO4 with x = 0.11 and 0.16, respectively. Samples were ground under ...