In:
Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 89, No. B7 ( 1984-07-10), p. 6041-6048
Abstract:
New shock wave Hugoniot data for pyrrhotite (Fe 0.9 S) 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/m 3 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.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JB089iB07p06041
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1984
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