GAC Mineral Deposits Division Publication

ATLAS OF ALTERATION
A Field and Petrographic Guide to Hydrothermal Alteration Minerals

CONTENTS

PREFACE AND ACKNOWLEDGEMENTS

CONTENTS

INTRODUCTION

Classification of Alteration

Organization of the Atlas

Interpretation of Alteration Mineralogy

References

Table 1: Summary of assemblages of alteration minerals

Abbreviations

HYDROTHERMAL MINERALS

Actinolite Intrusion-related

Albite Intrusion-related

Albite Sediment-hosted massive sulphide

Alunite Intrusion-related, Epithermal

Alunite Epithermal

Andalusite Intrusion-related

Anhydrite Intrusion-related

Apatite Intrusion-related

Barite Intrusion-related, Epithermal

Biotite Intrusion-related

Biotite Mesothermal

Calcite Epithermal

Carbonate Mesothermal

Carbonate Volcanogenic massive sulphide

Chlorite Volcanogenic massive sulphide

Chloritoid Volcanogenic massive sulphide

Clinopyroxene Skarn

Cordierite Volcanogenic massive sulphide

Diaspore Intrusion-related, Epithermal

Dumortierite Intrusion-related

Epidote Intrusion-related, Epithermal

Epidote Volcanogenic massive sulphide

Fluorite Intrusion-related

Garnet Skarn

Hematite Intrusion-related

Illite Intrustion-related, Epithermal

Kaolinite/dickite Intrusion-related, Epithermal

Magnetite Intrusion-related

Muscovite Intrusion-related

Muscovite (Sericite) Intrusion-related

Muscovite (Sericite) Volcanogenic massive sulphide

Orthoclase ("Adularia") Epithermal

Potassium Feldspar Intrusion-related

Pyrite/pyrrhotite (after magnetite) Mesothermal

Pyrophyllite Intrusion-related, Epithermal

Quartz (Jasperoid) Sediment-hosted

Quartz Volcanogenic massive sulphide, Epithermal

Quartz (Vuggy) Epithermal

Rutile (Anatase) Intrusion-related

Scapolite Skarn

Silica-carbonate Epithermal

Smectite Epithermal

Titanite Intrusion-related

Topaz Intrusion-related

Tourmaline Intrusion-related

Tourmaline Sediment-hosted massive sulphide

Vesuvianite Skarn

Wairakite Epithermal

Wollastonite Skarn

TABLE OF OPTICAL CHARACTERISTICS

INDEX

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Last modified: March 22, 2007
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