Pressure freezing of the Earth's inner core

Details Pressure freezing of the Earth's inner core Pressure freezing of the Earth's inner core

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39....5f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 39, Issue 1, p. 5-13.

Physics

4

Scientific paper

In an earlier paper (Fearn and Loper), it was shown that secular cooling of a completely molten iron-poor core cannot account for the presence of the Earth's solid inner core. Here, we investigate an alternative; that at least part of the inner core formed very early in the history of the Earth, during the accretion/differentiation process. The cause of the freezing of the inner core is then, not a decrease in temperature, but an increase in the central pressure as the mass of the Earth grows through accretion. Both iron-rich and iron-poor cores are considered, though the latter is discussed in more detail. As with the case of secular cooling, there is no problem freezing a solid inner core from an iron-rich core, but again, it seems most unlikely that the presence of the solid inner core is consistent with a core composition which is iron-poor.

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