1 Citation (Scopus)

Abstract

In this work, we report an experimental observation of a new CaCO3calcite-Vb phase, which occurs as the intermediate between aragonite and calcite-V at pressures >3.5 GPa and temperatures >1200 °C, suggesting it can exist in CaCO3-containing rocks at â 125-200 km. Calcite-Vb is determined to have the KClO3-Type structure with the monoclinic P21/m space group and lattice parameters of a = 6.284(5) Å, b = 4.870(3) Å, c = 3.991(4) Å, β = 107.94(3)°, and V = 116.19(15) Å3. Possible transformation mechanisms between calcite-Vb, aragonite, and calcite-V are illustrated.

Original languageEnglish
Pages (from-to)1506-1513
Number of pages8
JournalACS Earth and Space Chemistry
Volume6
Issue number6
Early online date26 May 2022
DOIs
Publication statusPublished - 16 Jun 2022

Keywords

  • aragonite
  • calcite
  • high-pressure
  • multianvil
  • phase transition
  • X-ray diffraction

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES

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