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Contributions to Mineralogy and Petrology

, Volume 161, Issue 3, pp 439–450 | Cite as

Ordering in double carbonates and implications for processes at subduction zones

  • T. HammoudaEmail author
  • D. Andrault
  • K. Koga
  • T. Katsura
  • A. M. Martin
Original Paper

Abstract

We have studied cation ordering in dolomite in situ as a function of pressure, temperature, and experimental time using the multi-anvil apparatus and synchrotron radiation. Starting with ordered dolomite, we observe the onset of disordering taking place at 950°C, while complete disordering is achieved at 1,070 (±20)°C, for pressures ranging between 3.37 and 4.05 GPa. Pressure does not appear to have significant effect on the order/disorder transition over the investigated range. We find that dolomite can reach its equilibrium ordering state above 900°C within duration of laboratory experiment (few hours), both from disordered state and from ordered state. In addition, we have reversed the dolomite breakdown reaction [magnesite + aragonite = dolomite] between 4.5 and 5.5 GPa, by monitoring diffraction peak intensity. We also have determined that dolomite is stable up to 7.4 GPa at 1,100°C. We confirm some earlier studies where a change in slope (dP/dT) has been observed, but we find a non-zero slope in the low pressure range. Combining the values of entropy obtained from dolomite degree of ordering with enthalpy values deduced from our bracketing of [magnesite + aragonite = dolomite] equilibrium, we model the location of dolomite breakdown in the P–T space as a function of cation ordering. By comparing previous conflicting studies, we show that, although kinetics of order/disorder is fast, disequilibrium dolomite breakdown is possible. Our modeling shows that subducted disordered dolomite present in carbonated sediments could be decomposed to [magnesite + aragonite] at lower pressure (3.5 GPa) than usually considered (>5 GPa). This 2-GPa (60 km) difference is valid on a fast subduction path and is possible if disorder inherited from sedimentation is preserved. On a slow subduction path, however, dolomite breakdown is encountered at about 250 km depth, which is 100 km deeper than currently considered.

Keywords

Carbonate Dolomite Aragonite Magnesite Synchrotron Order/disorder Kinetics Subduction zone 

Notes

Acknowledgments

The dolomite used in this investigation was kindly provided by C. Renac (Université Jean Monnet, Saint-Etienne). We thank J.-L. Devidal for X-ray characterization of starting materials at Laboratoire Magmas et Volcans and K.-I. Funakoshi and Y. Tange for their help during the experiments at SPring8. We thank RW Luth and an anonymous reviewer for their helpful comments. We thank JASRI for supporting the experimental work (Spring8 Proposal number 2007A1570). Part of traveling expenses was covered by the Japan-France Integrated Action Program (Sakura), project 12295XL (2006-2007). Preliminary experiments used the multianvil press of Laboratoire Magmas et Volcans, which is financially supported by the Centre National de la Recherche Scientifique (Instrument National de l’INSU).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • T. Hammouda
    • 1
    • 2
    • 3
    Email author
  • D. Andrault
    • 1
    • 2
    • 3
  • K. Koga
    • 1
    • 2
    • 3
  • T. Katsura
    • 4
    • 5
  • A. M. Martin
    • 1
    • 2
    • 3
    • 6
  1. 1.Laboratoire Magmas et VolcansClermont Université, Université Blaise PascalClermont-FerrandFrance
  2. 2.CNRS, UMR 6524, LMVClermont-FerrandFrance
  3. 3.IRD, R 163, LMVClermont-FerrandFrance
  4. 4.Institute for the Study of the Earth InteriorOkayama UniversityMisasaJapan
  5. 5.Bayerisches GeoinstitutUniversität BayreuthBayreuthDeutschland
  6. 6.NASA Johnson Space CenterHoustonUSA

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