Calculation of subsolidus phase relations in carbonates and pyroxenes

Alexandra Navrotsky, Douglas Loucks

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


This formulation of the free energy of mixing in a binary system takes as parameters a Bragg-Williams type cooperative disordering energy and the difference in free energy between different structures for the end-members. Subsolidus phase relations in carbonate systems such as CaCO3-MgCO3 and CdCO3-MgCO3 are calculated. Similar equations also reproduce the topologies of subsolidus phase relations in pyroxenes, including orthopyroxene-clinopyroxene phase boundaries in the enstatitediopside and ferrosilite-hedenbergite systems, the pigeonite-augite solvus, and the stability field of iron-free pigeonite.

Original languageEnglish (US)
Pages (from-to)109-127
Number of pages19
JournalPhysics and Chemistry of Minerals
Issue number1
StatePublished - Mar 1977

ASJC Scopus subject areas

  • General Materials Science
  • Geochemistry and Petrology


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