High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate

Dongzhou Zhang, Yi Hu, Jingui Xu, Robert T Downs, Julia E. Hammer, Przemyslaw K. Dera

Research output: Contribution to journalArticle

Abstract

Nickel is an abundant element in the bulk earth, and nickel-dominant olivine, liebenbergite, is the only igneous nickel-rich silicate found in nature. In this study, we used high-pressure single-crystal diffraction to explore the compressional behavior of a synthetic liebenbergite sample up to 42.6 GPa at ambient temperature. Over the studied pressure range, the liebenbergite sample retains the orthorhombic Pbnm structure, and no phase transition is observed. A third-order Birch-Murnaghan equation of state was used to fit the pressure behavior of the unit-cell volume, lattice parameters, the polyhedral volume, and the average bond length within each polyhedron. The best-fit bulk modulus K T0 = 163(3) GPa and its pressure derivative KT0′ $begin array K- rm T0' end array $ = 4.5(3). We find that liebenbergite is the most incompressible olivine-group silicate reported thus far, and Ni 2+ tends to increase the isothermal bulk modulus of both olivine- and spinel-structured silicates. Consequently, Ni-rich olivine has a higher density compared to Ni-poor olivine at the upper mantle P-T conditions; however enrichment of Ni in mantle olivine is generally too low to make this density difference relevant for fractionation or buoyancy.

Original languageEnglish (US)
Pages (from-to)580-587
Number of pages8
JournalAmerican Mineralogist
Volume104
Issue number4
DOIs
StatePublished - Apr 1 2019

Keywords

  • equation of states
  • high pressure
  • Ni
  • Olivine
  • single-crystal diffraction

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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