Reaction kinetics of dolomite rim growth

  • V. Helpa
  • E. Rybacki
  • R. Abart
  • L. F. G. Morales
  • D. Rhede
  • P. Jeřábek
  • G. Dresen
Original Paper

Abstract

Reaction rims of dolomite (CaMg[CO3]2) were produced by solid-state reactions at the contacts of oriented calcite (CaCO3) and magnesite (MgCO3) single crystals at 400 MPa pressure, 750–850 °C temperature, and 3–146 h annealing time to determine the reaction kinetics. The dolomite reaction rims show two different microstructural domains. Elongated palisades of dolomite grew perpendicular into the MgCO3 interface with length ranging from about 6 to 41 µm. At the same time, a 5–71 µm wide rim of equiaxed granular dolomite grew at the contact with CaCO3. Platinum markers showed that the original interface is located at the boundary between the granular and palisade-forming dolomite. In addition to dolomite, a 12–80 µm thick magnesio-calcite layer formed between the dolomite reaction rims and the calcite single crystals. All reaction products show at least an axiotactic crystallographic relationship with respect to calcite reactant, while full topotaxy to calcite prevails within the granular dolomite and magnesio-calcite. Dolomite grains frequently exhibit growth twins characterized by a rotation of 180° around one of the \([11\bar{2}0]\) equivalent axis. From mass balance considerations, it is inferred that the reaction rim of dolomite grew by counter diffusion of MgO and CaO. Assuming an Arrhenius-type temperature dependence, activation energies for diffusion of CaO and MgO are Ea (CaO) = 192 ± 54 kJ/mol and Ea (MgO) = 198 ± 44 kJ/mol, respectively.

Keywords

Rim growth Carbonates Diffusion Reaction kinetics Diffusion-controlled reaction 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • V. Helpa
    • 1
  • E. Rybacki
    • 1
  • R. Abart
    • 2
  • L. F. G. Morales
    • 1
  • D. Rhede
    • 1
  • P. Jeřábek
    • 3
  • G. Dresen
    • 1
  1. 1.GFZ PotsdamPotsdamGermany
  2. 2.University of ViennaWienAustria
  3. 3.Charles UniversityPragueCzech Republic

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