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Detailed Reference Information |
Sweeney, J.S. and Heinz, D.L. (1993). Melting of iron-magnesium-silicate perovskite. Geophysical Research Letters 20: doi: 10.1029/93GL00556. issn: 0094-8276. |
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Iron-magnesium-silicate perovskite was melted in a laser-heated diamond anvil cell and monitored by thermal analysis. Two signals were identified at each pressure: a lower temperature signal and a higher temperature signal. The lower signal may correspond to the temperature where iron diffuses rapidly. The higher signal would then correspond to melting of magnesium-enriched silicate perovskite. Alternatively, the lower signal may be the solidus where (Fe.14Mg.86)SiO3 undergoes incongruent melting to an iron-magnesium-enriched solid plus a silica-enriched liquid. Then, the higher signal would be the liquidus. The slope for the melting curve (the higher signal) between 30 GPa and 94 GPa is slightly negative. Fitting to a straight line gives a value for the slope of -2.5¿0.6 K/GPa. At 30 GPa, the lower signal is ≈300 K below the melting curve. They converge slightly at higher pressures and differ by ≈140 K at 94 GPa. Our melting curve is several hundred degrees (K) below previous estimates. ¿ American Geophysical Union 1993 |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Mineralogy, Petrology, and Rock Chemistry, Composition of the mantle and core, Mineralogy, Petrology, and Rock Chemistry, Experimental mineralogy and petrology, Mineral Physics, High-pressure behavior |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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