Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 373, Issue -, Pages 169-178Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2013.04.040
Keywords
Earth's core composition; high pressure; density; liquid iron alloys
Categories
Funding
- French National Research Agency (ANR) [2010-JCJC-604-01, ANR-12-BS04-0015-04]
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High-pressure, high-temperature in situ X-ray diffraction has been measured in liquid iron alloys (Fe-5 wt% Ni-12 wt% S and Fe-5 wt% Ni-15 wt% Si) up to 94 GPa and 3200 K in laser-heated diamond anvil cells. From the analysis of the X-ray diffuse scattering signal of the metallic liquids, we determined density and bulk modulus of the two liquid alloys. Comparison with a reference Earth model indicates that a core composition containing 6% of sulfur and 2% of silicon by weight would best match the geophysical data. Models with 2.5% of sulfur and 4-5% of silicon are still consistent with geophysical constraints whereas silicon only compositions are not. These results suggest only moderate depletion of sulfur in the bulk Earth. (C) 2013 Elsevier B.V. All rights reserved.
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