Complexing and Hydrothermal Ore Deposition

Complexing and Hydrothermal Ore Deposition

International Series of Monographs on Earth Science

1st Edition - January 1, 1964

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  • Author: Harold C. Helgeson
  • eBook ISBN: 9781483155432

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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

  • Preface



    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

Product details

  • No. of pages: 142
  • Language: English
  • Copyright: © Pergamon 1964
  • Published: January 1, 1964
  • Imprint: Pergamon
  • eBook ISBN: 9781483155432

About the Author

Harold C. Helgeson

About the Editor

Dean Earl Ingerson

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