Mössbauer Spectroscopic Study of the Decomposition Mechanism of Ankerite in CO2 Atmosphere

A. E. Milodowski1, B. A. Goodman2 and D. J. Morgan1
1 British Geological Survey, Keyworth, Nottingham NG12 5GG
2 The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB9 2QJ

Abstract: Mössbauer spectroscopy has been used to identify the iron-containing products that are formed during the thermal decomposition of ankerite in a CO2 atmosphere. The decomposition takes place in three stages and evidence is produced to show that the first stage involves decomposition of ankerite to yield a periclase-wustite solid solution, (Mg,Fe)O, along with calcite and CO2, the periclase-wustite then reacting with CO2 to produce magnesioferrite (MgFe2O4) and CO. In the second stage the magnesioferrite and calcite react to produce periclase and dicalcium ferrite. The third stage does not involve reaction of Fe-containing phases and corresponds to the decomposition of calcite to CaO.

Keywords: ankerite • decomposition • Mössbauer spectroscopy • CO2 atmosphere

Mineralogical Magazine; September 1989 v. 53; no. 372; p. 465-471; DOI: 10.1180/minmag.1989.053.372.06
© 1987, The Mineralogical Society
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