Complexing and Hydrothermal Ore Deposition - 1st Edition - ISBN: 9780080100845, 9781483155432

Complexing and Hydrothermal Ore Deposition

1st Edition

International Series of Monographs on Earth Science

Authors: Harold C. Helgeson
Editors: Dean Earl Ingerson
eBook ISBN: 9781483155432
Imprint: Pergamon
Published Date: 1st January 1964
Page Count: 142
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Complexing and Hydrothermal Ore Deposition provides a synthesis of fact, theory, and interpretative speculation on hydrothermal ore-forming solutions. This book summarizes information and theory of the internal chemistry of aqueous electrolyte solutions accumulated in previous years. The scope of the discussion is limited to those aspects of particular interest to the geologist working on the problem of hydrothermal ore genesis. Wherever feasible, fundamental principles are reviewed. Portions of this text are devoted to calculations of specific hydrothermal equilibriums in multicomponent solutions at elevated temperatures, including a general examination and evaluation of the solution chemistry and geochemical parameters involved in aqueous transport and deposition of the ore-forming metals. This publication is intended for geologists, but is also beneficial for students conducting research on the components of soil and rock.

Table of Contents




Chapter I. Introduction

Concepts, Definitions and Limitations

Chapter II. Thermo-chemical Parameters of Hydrothermal Complex Formation

Thermodynamic Relationships

Stabilities of Complexes at 25°C and One Atmosphere Pressure

Standard Entropy of Association

Standard Enthalpy of Association

Dissociational Equilibria

Degree of Formation of Complexes and Ligands

Complexing as a Function of Temperature

Thermodynamic Approximation of Dissociation Constants at Elevated Temperatures

Solvation and Complexing

Individual Ion Activity Coefficients

Complexing as a Function of Pressure

Complexing as a Function of Concentration


Chapter III. Solution Equilibria in a Portion of the System PbS-NaCl-HCl-H2O at Elevated Temperatures

Distribution of Species

Approximation of Thermo-chemical Data

Equilibrium Constants

Individual Ion Activity Coefficients

Calculation of Solution Equilibria

Results and Discussion

Galena Solubility

Complex Formation

Uncertainty of Results

Comparison with Experimental Data

Evaluation by Analogy with Thermo-chemical Consideration of a Portion of the System Ag2SO4-HNO3-H2O to 200°C

Summary of Conclusions

Chapter IV. Distribution of Species in Solution and the Controls of Hydrothermal Ore Deposition

Composition of Hydrothermal Solutions

Distribution of Species

pH of Hydrothermal Solutions


Depositional Controls

Phase Relations in a Portion of the System NaCl-H2O

Geothermal Gradients

Reactions between Solutions and Their Environments



Author Index

Subject Index


No. of pages:
© Pergamon 1964
eBook ISBN:

About the Author

Harold C. Helgeson

About the Editor

Dean Earl Ingerson

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