Mineral-fluid reaction rates.

J. V. Walther; B. J. Wood

Mineral-fluid reaction rates.

J. V. Walther, B. J. Wood

Research output: Contribution to journal › Article › peer-review

Abstract

At 25oC, silicate dissolution rates are pH dependent and vary widely from one mineral to another. At high T (300-700oC), however, the available data indicate that most minerals dissolve in aqueous and H₂O-CO₂ fluids with similar rate constants if their rates are normalized to a constant number of oxygen gramme atoms. These observations suggest the presence of a compensation relationship between pre-exponential and activation energy terms in the Arrhenius equation. A semiempirical correlation is noted between 25oC dissolution rate constants and the entropy per unit volume (So/Vo) of the dissolving mineral. At T >300oC, the relationship is summarized by the equation log k = -2900/T - 6.85 g atom oxygen cm^-2 s^-1. Uses of this equation show that isograd reactions go to completion with minimal T overstep (0.13oC for a 10oC/m.y. event) provided a fluid transporting medium is present.-R.A.H.

Original language	English
Pages (from-to)	194-211
Number of pages	18
Journal	American Society of Mechanical Engineers (Paper)
Publication status	Published - 1986

Cite this

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title = "Mineral-fluid reaction rates.",

abstract = "At 25oC, silicate dissolution rates are pH dependent and vary widely from one mineral to another. At high T (300-700oC), however, the available data indicate that most minerals dissolve in aqueous and H2O-CO2 fluids with similar rate constants if their rates are normalized to a constant number of oxygen gramme atoms. These observations suggest the presence of a compensation relationship between pre-exponential and activation energy terms in the Arrhenius equation. A semiempirical correlation is noted between 25oC dissolution rate constants and the entropy per unit volume (So/Vo) of the dissolving mineral. At T >300oC, the relationship is summarized by the equation log k = -2900/T - 6.85 g atom oxygen cm-2 s-1. Uses of this equation show that isograd reactions go to completion with minimal T overstep (0.13oC for a 10oC/m.y. event) provided a fluid transporting medium is present.-R.A.H.",

author = "Walther, {J. V.} and Wood, {B. J.}",

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journal = "American Society of Mechanical Engineers (Paper)",

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T1 - Mineral-fluid reaction rates.

AU - Walther, J. V.

AU - Wood, B. J.

PY - 1986

Y1 - 1986

N2 - At 25oC, silicate dissolution rates are pH dependent and vary widely from one mineral to another. At high T (300-700oC), however, the available data indicate that most minerals dissolve in aqueous and H2O-CO2 fluids with similar rate constants if their rates are normalized to a constant number of oxygen gramme atoms. These observations suggest the presence of a compensation relationship between pre-exponential and activation energy terms in the Arrhenius equation. A semiempirical correlation is noted between 25oC dissolution rate constants and the entropy per unit volume (So/Vo) of the dissolving mineral. At T >300oC, the relationship is summarized by the equation log k = -2900/T - 6.85 g atom oxygen cm-2 s-1. Uses of this equation show that isograd reactions go to completion with minimal T overstep (0.13oC for a 10oC/m.y. event) provided a fluid transporting medium is present.-R.A.H.

AB - At 25oC, silicate dissolution rates are pH dependent and vary widely from one mineral to another. At high T (300-700oC), however, the available data indicate that most minerals dissolve in aqueous and H2O-CO2 fluids with similar rate constants if their rates are normalized to a constant number of oxygen gramme atoms. These observations suggest the presence of a compensation relationship between pre-exponential and activation energy terms in the Arrhenius equation. A semiempirical correlation is noted between 25oC dissolution rate constants and the entropy per unit volume (So/Vo) of the dissolving mineral. At T >300oC, the relationship is summarized by the equation log k = -2900/T - 6.85 g atom oxygen cm-2 s-1. Uses of this equation show that isograd reactions go to completion with minimal T overstep (0.13oC for a 10oC/m.y. event) provided a fluid transporting medium is present.-R.A.H.

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JO - American Society of Mechanical Engineers (Paper)

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ER -

Mineral-fluid reaction rates.

Abstract

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