Thermodynamic modeling of solubility and speciation of silica in H2O-SiO2 fluid up to 1300C and 20 kbar based on the chain reaction formalism

Gerya, Taras; Maresch, Walter V.; Burchard, M.; Zakhartchouk, V.; Doltsinis, Nikos L.; Fockenberg, Thomas

doi:10.1127/0935-1221/2005/0017-0269

Cited by 47 publications

(46 citation statements)

References 33 publications

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“…The more recent quantitative relation by Gerya et al (2005) yields modest deviations from Eq. (5) for our test conditions and we preferred Eq.…”

Section: Solubility Of Sio 2 In Watermentioning

confidence: 86%

“…The solubility of quartz in water and its dependence on temperature and pressure have been a subject of a number of experimental studies since the 1940s (e.g., Fyfe and McKay, 1962;Gerya et al, 2005;Gratz and Bird, 1993b;Morey et al, 1962;Weill and Fyfe, 1964). The solution of quartz in water was thought to proceed congruently and reversibly according to SiO 2(s) + 2H 2 O (aq) ↔ H 4 SiO 4(aq) (Manning, 1994).…”

Section: Solubility Of Sio 2 In Watermentioning

confidence: 99%

“…The solution of quartz in water was thought to proceed congruently and reversibly according to SiO 2(s) + 2H 2 O (aq) ↔ H 4 SiO 4(aq) (Manning, 1994). More recent work, however, indicates that polymerization of the silicic acid product may be significant for the dissolution process (Doltsinis et al, 2007a, b;Gerya et al, 2005). We rely on the quantitative description by Fournier and Potter (1982) …”

Section: Solubility Of Sio 2 In Watermentioning

confidence: 99%

“…The quantitative description of dissolution, precipitation, and transport processes in the system SiO 2 -H 2 O is thus relevant for a general understanding of mass and energy transport in the earth's crust, and specifically, of the creation and sealing of fluid conduits requiring experimental determination of various kinetic parameters (see for example Lasaga and Blum, 1986). Consequently, the thermodynamics of quartz-water mixtures have been the subject of research for at least half a century, leading to constraints on solubility and dissolution kinetics of quartz in hydrous fluids (e.g., Gerya et al, 2005;Manning, 1994;Tester et al, 1994;Weill and Fyfe, 1964) as well as diffusion coefficients of silicon and oxygen in water and in quartz along different diffusion paths (e.g., Doltsinis et al, 2007a, b;Farver and Yund, 2000, 1991Joesten and Fisher, 1988;Milke and Heinrich, 2002).…”

Section: Introductionmentioning

confidence: 99%

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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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“…The more recent quantitative relation by Gerya et al (2005) yields modest deviations from Eq. (5) for our test conditions and we preferred Eq.…”

Section: Solubility Of Sio 2 In Watermentioning

confidence: 86%

Section: Solubility Of Sio 2 In Watermentioning

confidence: 99%

Section: Solubility Of Sio 2 In Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2014

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“…For example, making reasonable assumptions about quartz solubility (Gerya et al, 2005) and an antigorite formula with m=17, reaction (1) at 500 ºC and 1 GPa consumes only 1.3 mol % of the water that carries the SiO 2 required for the reaction.…”

Section: Slow Slip Behaviour Controlled By the Petrology Of Hanging Wmentioning

confidence: 99%

Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab–mantle interface

Mizukami

Yokoyama

Hiramatsu

et al. 2014

Earth and Planetary Science Letters

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It is known that plate boundaries in subduction zones show heterogeneous slip nature with strongly coupled seismogenic zones and various types of episodic tremor and slip (ETS) zones. In order to examine the petrological controls on the large-scale structure, we compared recent geophysical observations in the Shikoku area, southwest Japan with petrological models of the hanging wall mantle wedge. As a result, we found a close relationship between mineral assemblages in the mantle wedge and the characteristics of slow slip behaviour recorded in the Shikoku area: Short-term ETSs take place in the antigorite + olivine stability field and silent long-term slow slip events

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Thermodynamic Model for Mineral Solubility in Aqueous Fluids: Theory, Calibration and Application to Model Fluid‐Flow Systems

Dolejš

Manning

2010

Frontiers in Geofluids

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We present a thermodynamic model for mineral dissolution in aqueous fluids at elevated temperatures and pressures, based on intrinsic thermal properties and variations of volumetric properties of the aqueous solvent. The standard thermodynamic properties of mineral dissolution into aqueous fluid consist of two contributions: one from the energy of transformation from the solid to the hydrated-species state and the other from the compression of solvent molecules during the formation of a hydration shell. The latter contribution has the dimension of the generalized Krichevskii parameter. This approach describes the energetics of solvation more accurately than does the Born electrostatic theory and can be extended beyond the limits of experimental measurements of the dielectric constant of H 2 O. The new model has been calibrated by experimental solubilities of quartz, corundum, rutile, calcite, apatite, fluorite and portlandite in pure H 2 O at temperatures up to 1100°C and pressures up to 20 kbar. All minerals show a steady increase in solubility along constant geothermal gradients or water isochores. By contrast, isobaric solubilities initially increase with rising temperature but then decline above 200-400°C. This retrograde behavior is caused by variations in the isobaric expansivity of the aqueous solvent, which approaches infinity at its critical point. Oxide minerals predominantly dissolve to neutral species; so, their dissolution energetics involve a relatively small contribution from the solvent volumetric properties and their retrograde solubilities are restricted to a relatively narrow window of temperature and pressure near the critical point of water. By contrast, Ca-bearing minerals dissolve to a variety of charged species; so, the energetics of their dissolution reactions involve a comparatively large contribution from volume changes of the aqueous solvent and their isobaric retrograde solubility spans nearly all metamorphic and magmatic conditions. These features correlate with and can be predicted from the standard partial molar volumes of aqueous species.The thermodynamic model can be used over much wider range of settings for terrestrial fluid-rock interaction than has previously been possible. To illustrate, it is integrated with transport theory to show quantitatively that integrated fluid fluxes characteristic of crustal shear zones are capable of precipitating quartz or calcite veins from low-and medium-grade metamorphic conditions, at a geothermal gradient of 20°C km )1 . For subduction zones, modeled by a geotherm of 7°C km )1 , the required fluid fluxes are one to two orders of magnitude lower and predict enhanced efficiency of mass transfer and metasomatic precipitation in comparison with orogenic settings. The new model thus can be applied to shallow hydrothermal, metamorphic, magmatic and subduction fluids, and for retrieval of dependent thermodynamic properties for mass transfer or geodynamic modeling.

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Thermodynamic modeling of solubility and speciation of silica in H2O-SiO2 fluid up to 1300C and 20 kbar based on the chain reaction formalism

Cited by 47 publications

References 33 publications

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

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

Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab–mantle interface

Thermodynamic Model for Mineral Solubility in Aqueous Fluids: Theory, Calibration and Application to Model Fluid‐Flow Systems

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