Growth rate of the {0001} and {0111} faces of quartz as a function of temperature

Ostapenko, G. T.; Mitsyuk, B. M.

doi:10.1134/s0016702906120081

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…For the most part, the range of activation energies found here further exceeds previously reported values for the activation energy of dissolution, 89 ± 5 kJ mol −1 (Tester et al, 1994), 71 ± 9 kJ mol −1 (Dove and Crerar, 1990), and 67 to 77 kJ mol −1 (Rimstidt and Barnes, 1980), and precipitation/growth, 84 ± (4-8) kJ mol −1 (Laudise, 1959;Ostapenko and Mitsyuk, 2006). These rather low values likely document that dissolution of real crystals is dominated by processes at crystal defects (see discussion by Adeagbo et al, 2008;Dove and Crerar, 1990).…”

Section: Diffusion Pathsupporting

confidence: 62%

Transport processes at quartz-water interfaces: constraints from hydrothermal grooving experiments

Klevakina¹,

Renner²,

Doltsinis³

et al. 2013

Preprint

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We performed hydrothermal annealing experiments on quartzite at temperatures of 392 to 568 °C and fluid pressures of 63 to 399 MPa for up to 120 h during which hydrothermal grooves developed on the free surfaces of the samples. Analysis of surface topology and groove characteristics with an atomic force microscope revealed a range of surface features associated with the simultaneous and successive operation of several processes partly depending on crystal orientation during the various stages of an experiment. Initially, dissolution at the quartzite-sample surface occurs to saturate the fluid in the capsule with SiO₂. Subsequently, grooving controlled by diffusion processes takes place parallel to dissolution and precipitation due to local differences in solubility. Finally, quench products develop on grain surfaces during the termination of experiments. Average groove-root angle amounts to about 80° and slightly depends on temperature, run duration, and misorientation between neighboring grains. The grooving is thermally activated, i.e., groove depth ranging from 5 nm to several micrometers for the entire suite of experiments generally increases with temperature and/or run time. We use Mullins' classical theories to constrain kinetics parameters for the transport processes controlling the grooving. In the light of previous measurements of various diffusion coefficients in the system SiO₂-H₂O, interface diffusion of Si is identified as the most plausible rate-controlling process. Grooving could potentially proceed faster if the fluid were not convecting in the capsule. Characteristic times of healing of microfractures in hydrous environments constrained from these kinetics parameters are consistent with the order of magnitude of time scales over which healing occurs in-situ according to geophysical surveys and of recurrence intervals of earthquakes

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Section: Diffusion Pathsupporting

confidence: 62%

Transport processes at quartz-water interfaces: constraints from hydrothermal grooving experiments

Klevakina¹,

Renner²,

Doltsinis³

et al. 2013

Preprint

View full text Add to dashboard Cite

show abstract

“…A single observation at 0.6 GPa indicates a subordinate effect of pressure. For the most part, the range of activation energies found here further exceeds previously reported values for the activation energy of dissolution, 89 ± 5 kJ mol −1 (Tester et al, 1994), 71 ± 9 kJ mol −1 (Dove and Crerar, 1990), and 67 to 77 kJ mol −1 (Rimstidt and Barnes, 1980), and precipitation/growth, 84 ± (4-8) kJ mol −1 (Laudise, 1959;Ostapenko and Mitsyuk, 2006). These rather low values likely document that dissolution of real crystals is dominated by processes at crystal defects (see discussion by Adeagbo et al, 2008;Dove and Crerar, 1990).…”

Section: Results and Their Comparison To Previous Studiesmentioning

confidence: 41%

“…This switch from preferential dissolution during the equilibration to growth at equilibrium concentration may be related to a contrasting order of dissolution kinetics and surface energy for the low index orientations. Several previous studies found that c faces grow faster than any other face at conditions not too far away from the ones of our experiments (Laudise, 1959;Okamoto and Sekine, 2011;Ostapenko and Mitsyuk, 2006). Surfaces that experienced substantial dissolution may also simply have developed a defect structure that is particularly suitable for subsequent precipitation (compare Bickmore et al, 2008;Schlegel et al, 2002).…”

Section: Process Sequence In Experimentsmentioning

confidence: 81%

Transport processes at quartz–water interfaces: constraints from hydrothermal grooving experiments

et al. 2014

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Abstract. We performed hydrothermal annealing experiments on quartzite samples at temperatures of 392 to 568 • C and fluid pressures of 63 to 399 MPa for up to 120 h, during which hydrothermal grooves developed on the free surfaces of the samples. An analysis of surface topology and groove characteristics with an atomic force microscope revealed a range of surface features associated with the simultaneous and successive operation of several processes partly depending on crystal orientation during the various stages of an experiment. Initially, dissolution at the quartzite-sample surface occurs to saturate the fluid in the capsule with SiO 2 . Subsequently, grooving controlled by diffusion processes takes place parallel to dissolution and precipitation due to local differences in solubility. Finally, quench products develop on grain surfaces during the termination of experiments. The average groove-root angle amounts to about 160 • , varying systematically with misorientation between neighboring grains and depending slightly on temperature and run duration. The grooving is thermally activated, i.e., groove depth ranging from 5 nm to several micrometers for the entire suite of experiments generally increases with temperature and/or run time. We use Mullins' classical theories to constrain kinetic parameters for the transport processes controlling the grooving. In the light of previous measurements of various diffusion coefficients in the system SiO 2 -H 2 O, interface diffusion of Si is identified as the most plausible rate-controlling process. Grooving could potentially proceed faster by diffusion through the liquid if the fluid were not convecting in the capsule. Characteristic times of healing of microfractures in hydrous environments constrained from these kinetic parameters are consistent with the order of magnitude of timescales over which postseismic healing occurs in situ according to geophysical surveys and recurrence intervals of earthquakes.

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Growth rate of the {0001} and {0111} faces of quartz as a function of temperature

Cited by 2 publications

References 1 publication

Transport processes at quartz-water interfaces: constraints from hydrothermal grooving experiments

Transport processes at quartz-water interfaces: constraints from hydrothermal grooving experiments

Transport processes at quartz–water interfaces: constraints from hydrothermal grooving experiments

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