Diffusion of electrolytes in hydrothermal systems: free solution and porous media

Balashov, Victor N.

doi:10.1007/978-94-011-1226-0_9

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…This value is somewhat lower than the estimates of the diffusion coef®cients for components in solid phases obtained by experimental data for the respective PT-parameters (Balashov, 1995) and are quite close to experimentally-derived grain-boundary diffusion coef®cients in mineral aggregates Yund, 1995, 1996). Although the effective diffusion coef®cient is less precisely estimated in our models, partly due to uncertainty in the time scale of the reaction, it is a good indication that the results compare well with experimental data and are consistent with solid-state diffusion, especially through grain boundaries.…”

Section: Discussioncontrasting

confidence: 41%

Inverse modeling approach for obtaining kinetic parameters of diffusion-controlled metamorphic reactions in the Kharlovo Contact Aureole (South Siberia, Russia)

Лиханов

Ananiev

Ревердатто

et al. 2001

Mineralogy and Petrology

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A new approach for deriving kinetic parameters of diffusion-controlled metamorphic reactions is described. It is based on comparison of models of temperature ®eld evolution near a cylindrical intrusion and observable chemical changes in biotite at the contact aureole of the Kharlovo massif. Unlike other methods used to construct quantitative models of reactions which produce distinctly expressed zoned microtextures, the proposed approach allows better understanding of the processes occurring in texture-homogeneous rocks, where complete consumption of some reactant mineral phases prevent accurate reconstruction of the metamorphic process. The calculations yielded estimates of the effective rates of metamorphic reactions 10 À12 s À1 and the effective diffusion coef®cient 5X29 Â 10 À16 cm 2 s À1 . These values are consistent with experimentally and theoretically derived estimates of solid-state diffusion, including grain-boundary diffusion. ZusammenfassungInverse Modellierung zur Bestimmung kinetischer Parameter diffusionskontrollierter metamorpher Reaktionen in der Kontaktaureole von Kharlovo (Su Èdsibirien, Ruûland)Ein neuer Ansatz zur Herleitung kinetischer Parameter diffusionskontrollierter metamorpher Reaktionen wird beschrieben. Er basiert auf einem Vergleich der Modelle f ur die Temperaturentwicklung um eine zylindrische Intrusion mit beobachtbaren Anderungen im Chemismus von Biotit in der Kontaktaureole des Kharlovo Massivs. Im Unterschied zu anderen Methoden, die quantitative Modelle von Reaktionen mit deutlich zonierten Mikrotexturen verwenden, erlaubt dieser Ansatz ein besseres Verst andnis der Prozesse in texturell homogenen Gesteinen, in denen die vollst andige Reaktion einiger Reaktanden (Mineralphasen) sonst die Rekonstruktion des Metamorphoseprozesses verhindert. Die Berechnungen erlauben eine Abscha Ètzung der metamorphen Reaktionsraten 10 À12 s À1 und des effektiven Diffusionskoef®zienten 5X29 Ã 10 À16 cm 2 s À1 . Diese Werte sind mit experimentell und theoretisch ermittelten Werten der Diffusion in Festk orpern, einschlieûlich der Diffusion entlang von Korngrenzen, konsistent.

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Section: Discussioncontrasting

confidence: 41%

Inverse modeling approach for obtaining kinetic parameters of diffusion-controlled metamorphic reactions in the Kharlovo Contact Aureole (South Siberia, Russia)

Лиханов

Ananiev

Ревердатто

et al. 2001

Mineralogy and Petrology

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“…The data on limiting equivalent sulfate conductance are necessary to predict the diffusion transport of sulfate components in geochemical processes involving fluid-rock interaction (Balashov, 1995).…”

Section: Introductionmentioning

confidence: 99%

Dissociation constants and speciation in aqueous Li2SO4 and K2SO4 from measurements of electrical conductance to 673K and 29MPa

Sharygin

Grafton

Xiao³

et al. 2006

Geochimica et Cosmochimica Acta

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“…Despite the simplicity of this calculation, there is little evidence from the figures for such dramatic dilution. While membrane filtration (Graf 1982) provides a convenient mechanism to explain this anomaly, it has not stood up to field testing (Hanor 1994b), and indeed is likely to become less effective during metamorphism as a result of grain coarsening (Balashov 1994).…”

Section: Discussionmentioning

confidence: 99%

The origins of salinity in metamorphic fluids

Yardley

Graham²

2002

Geofluids

146

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Evaluation of data on formation waters and metamorphic fluids sampled by drilling or preserved in fluid inclusions reveals little correlation between fluid salinity and metamorphic grade, but a strong link to original sedimentary setting. Sediments and metasediments deposited originally in shallow marine environments can contain fluids with a very wide range of salinities, but they are commonly near twice seawater salinity or higher. With increasing metamorphic grade, a very wide range of salinities may develop, with the highest levels tracking halite saturation. Oceanic and accretionary prism sequences yield low-salinity fluids, close to seawater values, almost irrespective of metamorphic grade until extreme conditions are reached where removal of water may increase fluid salinity. The salinities of metamorphic fluids exert a fundamental control on both fluid phase equilibria and metal-transporting capability, and appear, to a large degree, to reflect the original presence or absence of highly saline formation waters and/or evaporites in the initial sedimentary sequence.

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Diffusion of electrolytes in hydrothermal systems: free solution and porous media

Cited by 8 publications

References 22 publications

Inverse modeling approach for obtaining kinetic parameters of diffusion-controlled metamorphic reactions in the Kharlovo Contact Aureole (South Siberia, Russia)

Inverse modeling approach for obtaining kinetic parameters of diffusion-controlled metamorphic reactions in the Kharlovo Contact Aureole (South Siberia, Russia)

Dissociation constants and speciation in aqueous Li2SO4 and K2SO4 from measurements of electrical conductance to 673K and 29MPa

The origins of salinity in metamorphic fluids

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