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Double carbonate breakdown reactions at high pressures: an experimental study in the system CaO–MgO–FeO–MnO–CO2

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Abstract

The pressure–temperature conditions of the reactions of the double carbonates CaM(CO3)2, where M = Mg (dolomite), Fe (ankerite) and Mn (kutnohorite), to MCO3 plus CaCO3 (aragonite) have been investigated at 5–8 GPa, 600–1,100°C, using multi-anvil apparatus. The reaction dolomite = magnesite + aragonite is in good agreement with the results of Sato and Katsura (Earth Planet Sci 184:529–534, 2001), but in poor agreement with the results of Luth (Contrib Mineral Petrol 141:222–232, 2001). The dolomite is partially disordered at 620°C, and fully disordered at 1,100°C. All ankerite and kutnohorite samples, including the synthetic starting materials, are disordered. The P–T slopes of the three reactions increase in the order M = Mg, Fe, Mn. The shallower slope for the reaction involving magnesite is due partly to its having a higher compressibility than expected from unit-cell volume considerations. At low pressures there is a preference for partitioning into the double carbonate of Mg > Fe > Mn. At high pressures the partitioning preference is reversed. Using the measured reaction positions, the P–T conditions at which dolomite solid solutions will break down on increasing P and T in subduction zones can be estimated.

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Acknowledgments

M.M. was supported by NERC studentship GT04/99/ES/185. We thank Dave Plant for help with SEM analysis, and Shigeaki Ono and an anonymous reviewer for their constructive reviews of the manuscript.

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Authors and Affiliations

  1. School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK

    Martin Morlidge, Alison Pawley & Giles Droop

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  1. Martin Morlidge
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  2. Alison Pawley
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  3. Giles Droop
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Correspondence to Alison Pawley.

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Communicated by T.L. Grove

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Morlidge, M., Pawley, A. & Droop, G. Double carbonate breakdown reactions at high pressures: an experimental study in the system CaO–MgO–FeO–MnO–CO2 . Contrib Mineral Petrol 152, 365–373 (2006). https://doi.org/10.1007/s00410-006-0112-5

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  • DOI: https://doi.org/10.1007/s00410-006-0112-5

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