Mechanisms and Geochemical Models of Core Formation

David C. Rubie*, Seth A. Jacobson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Scopus citations

Abstract

This chapter reviews the mechanisms by which metal and silicate segregate to form the cores and mantles of planetary bodies. It also reviews geochemical models of core formation and considers the implications of these for the evolution of mantle and core chemistries. Many studies in recent years have concluded that core formation in Earth involved extensive chemical equilibration between metal and silicate at high pressures. The chapter discusses two mechanisms that are consistent with such equilibration, namely grain-scale percolation and metal-silicate segregation in a magma ocean. Earth's mantle is depleted in siderophile elements, relative to chondritic and Solar System abundances, because of extraction into the core. The degree of depletion depends on the metal-silicate partition coefficient. Accretion and core-mantle differentiation of the terrestrial planets can now be modeled by combining astrophysical simulations of planetary accretion with geochemical models of core formation.

Original languageEnglish (US)
Title of host publicationDeep Earth
Subtitle of host publicationPhysics and Chemistry of the Lower Mantle and Core
Publisherwiley
Pages181-190
Number of pages10
ISBN (Electronic)9781118992487
ISBN (Print)9781118992470
DOIs
StatePublished - Jan 1 2015

Keywords

  • Core formation
  • Core-mantle differentiation
  • Geochemical models
  • Grain-scale percolation
  • Metal-silicate segregation
  • Planetary accretion
  • Terrestrial planets

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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    Rubie, D. C., & Jacobson, S. A. (2015). Mechanisms and Geochemical Models of Core Formation. In Deep Earth: Physics and Chemistry of the Lower Mantle and Core (pp. 181-190). wiley. https://doi.org/10.1002/9781118992487.ch14