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Hugoniot data for pyrrhotite and the Earth's core

Brown, J. Michael and Ahrens, Thomas J. and Shampine, Dennis L. (1984) Hugoniot data for pyrrhotite and the Earth's core. Journal of Geophysical Research B, 89 (B7). pp. 6041-6048. ISSN 0148-0227. doi:10.1029/JB089iB07p06041.

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New shock wave Hugoniot data for pyrrhotite (Fe_(0.9S)) 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/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.

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Additional Information:Copyright 1984 by the American Geophysical Union. (Received August 15, 1983; revised February 6, 1984; accepted February 22, 1984.) Paper number 4B0358. This paper is dedicated to the memory of John C. Jamieson, who was professor of geophysics at the University of Chicago and a frequent visitor at Los Alamos. Jamieson was not only a pioneer in static and dynamic high-pressure research applied to geophysics but also a continuing source of inspiration to our generation of experimentalists. This work was supported in part by the National Science Foundation (grants EAR 8109591 and EAR 8108616) and by the Department of Energy. This work is contribution 31, Geodynamics Program, Texas A&M University, and contribution 3869, Division of Geological and Planetary Sciences, California Institute of Technology.
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NSFEAR 8109591
NSFEAR 8108616
Department of Energy (DOE)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3869
Texas A&M University, Geodynamics Program31
Issue or Number:B7
Record Number:CaltechAUTHORS:20141030-124108087
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Official Citation:Brown, J. M., T. J. Ahrens, and D. L. Shampine (1984), Hugoniot data for pyrrhotite and the Earth's core, J. Geophys. Res., 89(B7), 6041–6048, doi:10.1029/JB089iB07p06041.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51075
Deposited By: George Porter
Deposited On:30 Oct 2014 20:31
Last Modified:10 Nov 2021 19:05

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