Chemical and Physical Properties and Thermal State of the Core

Eiji Ohtani

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Citations (Scopus)

Abstract

This chapter reviews recent advances in high-pressure mineral physics of the Earth's central regions. The existence of a dense melt at the core-mantle boundary (CMB) is proposed for the ultra-low velocity zone. Possible candidates for the light elements in the core are summarized. The phase relations, compression, and sound velocity of iron-light-element alloys have been studied intensively, based on the static experiments, shock compression, and theoretical works. The chapter summarizes the present status of these works and their implications for the compositions of the outer and inner cores. To achieve a definite conclusion on the light element contents of the core, we need to establish pressure scales at the high pressure and temperature of the Earth's core, and to measure the density and sound velocity of the iron-light-element alloys covering the pressure and temperature conditions of the inner core.

Original languageEnglish
Title of host publicationPhysics and Chemistry of the Deep Earth
PublisherJohn Wiley and Sons
Pages244-270
Number of pages27
ISBN (Print)9780470659144
DOIs
Publication statusPublished - 2013 Mar 24

Keywords

  • Core-mantle boundary (CMB)
  • Earth
  • High-pressure mineral physics
  • Inner core
  • Light elements
  • Melt properties
  • Outer core
  • Thermal state

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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  • Cite this

    Ohtani, E. (2013). Chemical and Physical Properties and Thermal State of the Core. In Physics and Chemistry of the Deep Earth (pp. 244-270). John Wiley and Sons. https://doi.org/10.1002/9781118529492.ch8