Hugoniot data for pyrrhotite and the earth's core

Details Hugoniot data for pyrrhotite and the earth's core Hugoniot data for pyrrhotite and the earth's core

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6041b&link_type=abstract

Journal of Geophysical Research, Volume 89, Issue B7, p. 6041-6048

Physics

57

Scientific paper

New shock wave Hugoniot data for pyrrhotite (Fe0.9S) now describe the equation of state to nearly twofold compression at a maximum pressure of 274 GPa. A minor discontinuity on the Hugoniot between 100 and 150 GPa is interpreted as the melting transition. While not tightly constrained, the inferred melting point lies below lower-bound temperature estimates based on the Lindemann criterion. The highest-pressure Hugoniot data (representing the melted phase) are used to model the equation of state for liquid iron sulfide. A density for liquid pyrrhotite of 7.80+/-0.20 Mg/m3 under core-mantle boundary conditions (P=135 GPa, T=4000 K) is calculated. Assuming that sulfur is the primary alloying element in a predominately iron core, the present data are consistent with a homogeneous outer core containing 10+/-4 wt% sulfur.

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