Rema OF GEOLOGY 
SeEP PE VEER-OGhOBE Ry 1073 
THE GENERAL PRINCIPLES UNDERLYING 
METAMORPHIC PROCESSES 
JOHN JOHNSTON anp PAUL NIGGLI 
Geophysical Laboratory, Carnegie Institution of Washington 
CONTENTS 
Part I 
INTRODUCTION 
EFFECTS OF TEMPERATURE AND PRESSURE ON SYSTEMS SOLID-SOLID 
General Considerations 
Importance of Rate of Transformation 
Enantiotropic Transformations 
Enantiotropic Transformation of Mix-Crystals 
Phenomenon of Allotropy 
Monotropic Transformations 
Geologic Thermometer 
Reactions in Systems Solid-Solid 
EFFECTS OF TEMPERATURE AND (UNIFORM) PRESSURE ON SYSTEMS SOLID- 
FLUID 
General Considerations 
Dependence upon Character of Compression 
EFFECT OF UNIFORM PRESSURE ON MELTING-POINTS 
EFFECT OF UNIFORM PRESSURE ON SOLUBILITY 
Importance of Solubility Relations 
Law oF Mass ACTION AND THE REACTION CONSTANT 
Constant Solubility Product 
Salt Hydrolysis 
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