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Book Chapter

pH Calculations for Hydrothermal Fluids

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Published:
January 01, 1984

Abstract

In the last chapter the relationship between alteration mineralogy and fluid chemistry was discussed using a greatly oversimplified scheme for estimating the pHt of deep system fluids. We use this as a starting point to consider some further implications of the fluid- mineral equilibria we have considered and then develop some calculation procedures to improve our calculation of pHt for high temperature fluids from analytical data.

Drill core from hydrothermal systems contains a number of secondary minerals such as Kmica, K-feldspar, and epidote that result from the alteration of primary minerals. In many hydrothermal studies it is assumed that fluid composition and pH were controlled--or buffered—by simple alteration phase equilibria. We can examine this proposition as follows. If the pH controlling equilibria are

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Contents

Society of Economic Geologists Guidebook Series

Fluid-Mineral Equilibria in Hydrothermal Systems

R. W. Henley
R. W. Henley
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A. H. Truesdell
A. H. Truesdell
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P. B. Barton, Jr.
P. B. Barton, Jr.
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J. A. Whitney
J. A. Whitney
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Society of Economic Geologists
Volume
1
ISBN electronic:
9781629490083
Publication date:
January 01, 1984

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