A theoretical approach to the kinetics of calcite ⇌ aragonite transition: application to laboratory experiments

Madon, M.; Gillet, Ph.

doi:10.1016/0012-821x(84)90178-x

Cited by 20 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A dislocation glide mechanism (42), whereby motion of a partial dislocation causes a shear of the Ca> sublattice, has been proposed. The kinetics of the aragonite-calcite transformation have been extensively studied (38,(42)(43)(44)(45)(46)(47)(48)(49)(50)(51). The transition has a small, positive enthalpy change ( H from 0.21 to 4.88 kJ mol\), but has a high activation energy (E from 160 to 750 kJ mol\).…”

Section: Comparison With Experimental Studiesmentioning

confidence: 99%

Modeling the Thermal Decomposition of Solids on the Basis of Lattice Energy Changes

Croix¹,

English²,

Brown³

et al. 1998

Journal of Solid State Chemistry

View full text Add to dashboard Cite

Section: Comparison With Experimental Studiesmentioning

confidence: 99%

Modeling the Thermal Decomposition of Solids on the Basis of Lattice Energy Changes

Croix¹,

English²,

Brown³

et al. 1998

Journal of Solid State Chemistry

View full text Add to dashboard Cite

“…calcite to aragonite transformation and this is probably due to an increase in the number of nucleation sites. A change in the transformation mechanism, as suggested by Madon & Gillet (1984), is unlikely in naturally deformed rocks, but cannot be ruled out for low temperature, high stress conditions. On the other hand, the rate of the aragonite to calcite transformation is decreased if aragonite is ductilely deformed because its accommodation mechanism during dislocation creep involves grain boundary recrystallization which results in a large grain size reduction.…”

Section: Discussionmentioning

confidence: 98%

“…They proposed that strained calcite is metastable with respect to aragonite at conditions well within the normal calcite stability field, and that the transformation to aragonite is energetically favoured over the recovery of calcite. Madon & Gillet (1984) proposed a mechanism to explain this observation for both directions of the transformation. They suggested that the transformation might occur by a martensitic mechanism involving partial dislocations gliding through the aragonite or calcite structure dragging stacking faults of the other polymorph.…”

Section: Previous Workmentioning

confidence: 99%

“…A change in the transformation mechanism during ductile deformation was suggested for calcite-aragonite by Madon & Gillet (1984), who adapted a suggestion for the olivine-spinel transformation from Poirier (1981). This transformation mechanism involves dislocation glide; partial dislocations nucleating at grain boundaries drag stacking faults which have the structure of the other polymorph.…”

Section: The Effect Of Ductile Deformation On Transformation Ratementioning

confidence: 99%

“…Rubie, 1983;Beach, 1980), especially with regard to how ductile deformation may affect the kinetics and mechanisms of mineralogical processes (e.g. Poirier, 1981;Madon & Gillet, 1984). Interactions which are thought to be important include increased nucleation rates due to grain size reduction or a high dislocation density (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of ductile deformation on the kinetics and mechanisms of the aragonite‐calcite transformation

Snow

Yund

1987

Journal Metamorphic Geology

View full text Add to dashboard Cite

Abstract. The effect of ductile deformation (dislocation creep) on the kinetics of the aragonite-calcite transformation has been studied at 1 atm (330°C and 360°C) and 900-1500 MPa (500" C) using undeformed and either previously or simultaneously deformed samples (500' C and a strain rate of s).Deformation enhances the rate of the transformation of calcite to aragonite, but decreases the rate of transformation of aragonite to calcite. The difference results from a dependence of transformation rate on grain size, coupled with a difference in the accommodation mechanisms, climb versus recrystallization, of these minerals during dislocation creep. Dislocation climb is relatively easy in calcite and thus plastic strain results in high dislocation densities without significant grain size reduction. The rate of transformation to aragonite is enhanced primarily because of the increase in nucleation sites at dislocations and subgrain boundaries. In aragonite, on the other hand, dislocation climb is difficult and thus plastic strain produces extensive dynamic recrystallization resulting in a substantial grain size reduction. The transformation of aragonite is inhibited because the increase in calcite nucleation sites at dislocations and/or new grain boundaries is more than offset by the inability of calcite to grow across high angle grain boundaries. Thus the net effect of ductile deformation by dislocation creep on the kinetics of polymorphic phase transformations depends on the details of the accommodation mechanism.

show abstract

Transformation kinetics of polycrystalline aragonite to calcite: new experimental data, modelling, and implications

Liu

Yund

1993

Contr. Mineral. and Petrol.

View full text Add to dashboard Cite

A theoretical approach to the kinetics of calcite ⇌ aragonite transition: application to laboratory experiments

Cited by 20 publications

References 20 publications

Modeling the Thermal Decomposition of Solids on the Basis of Lattice Energy Changes

Modeling the Thermal Decomposition of Solids on the Basis of Lattice Energy Changes

The effect of ductile deformation on the kinetics and mechanisms of the aragonite‐calcite transformation

Transformation kinetics of polycrystalline aragonite to calcite: new experimental data, modelling, and implications

Contact Info

Product

Resources

About