期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 75, 期 8, 页码 2072-2087出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2011.01.030
关键词
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资金
- U.S. National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [0757853] Funding Source: National Science Foundation
The composition and evolution of a metallic planetary core is determined by the behavior with pressure of the eutectic and the liquidus on the Fe-rich side of the Fe-FeS eutectic. New experiments at 6 GPa presented here, along with existing experimental data, inform a thermodynamic model for this liquidus from 1 bar to at least 10 GPa. Fe-FeS has a eutectic that becomes more Fe-rich but remains constant in T up to 6 GPa. The 1 bar, 3 GPa, and 6 GPa liquidi all cross at a pivot point at 1640 +/- 5 K and FeS37 +/- 0.5. This liquid/crystalline metal equilibrium is T-x-fixed and pressure independent through 6 GPa. Models of the 1 bar through 10 GPa experimental liquidi show that with increasing P there is an increase in the T separation between the liquidus and the crest of the metastable two-liquid solvus. The solvus crest decreases in T with increasing P. The model accurately reproduces all the experimental liquidi from 1 bar to 10 GPa, as well as reproducing the 0-6 GPa pivot point. The 14 GPa experimental liquidus (Chen et al., 2008a, b) deviates sharply from the lower pressure trends indicating that the 0-10 GPa model no longer applies to this 14 GPa data. (C) 2011 Elsevier Ltd. All rights reserved.
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