Compressibility change in iron-rich melt and implications for core formation models

C. Sanloup, W. van Westrenen, R. Dasgupta, H. Maynard-Casely, J. -P Perrillat

Research output: Contribution to journalArticlepeer-review

Abstract

Metallic iron, in both solid and liquid states, is the dominant component of Earth's core. Density measurements of molten iron containing an appropriate amount of light elements (5.7 wt.% carbon) identified a liquid liquid transition by a significant compressibility increase in the vicinity of the delta-gamma-liquid triple point at 5.2 GPa. This transition pressure coincides with a marked change in the pressure evolution of the distributions of nickel, cobalt and tungsten between liquid metal and silicate melt that form a cornerstone of geochemical models of core formation. The identification of a clear link between molten metal polymorphism and metal silicate element partitioning implies that reliable geochemical core formation models will need to incorporate the effects of these additional liquid metal transitions. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)118-122
Number of pages5
JournalEarth and Planetary Science Letters
Volume306
Issue number1-2
DOIs
Publication statusPublished - 1 Jun 2011

Keywords

  • molten Fe
  • compressibility
  • core
  • siderophile elements
  • SILICATE PARTITION-COEFFICIENTS
  • CENTERED-CUBIC IRON
  • EARTHS CORE
  • LIQUID-IRON
  • MAGMA OCEAN
  • OXYGEN FUGACITY
  • HIGH-PRESSURES
  • FE
  • TEMPERATURE
  • NICKEL

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