The University Museum
The University of Tokyo


Bulletin No.32


ELECTRUM:
CHEMICAL COMPOSITION, MODE OF OCCURRENCE, AND DEPOSITIONAL ENVIRONMENT


Naotatsu Shikazono
Masaaki Shimizu


1988 TOKYO




CONTENTS

Chapter I     Introduction
Chapter II     General Outline of Deposits Studied
1. Epithermal-Type Deposits
 1) Deposits in Japan
 2) Deposits in the Korean Peninsula
 3) Deposits in Taiwan
2. Hypo/Mesothermal Vein-Type Deposits
 1) Deposits in Japan
 2) Deposits in the Korean Peninsula
3. Kuroko-Type Deposits
4. Skarn-Type Deposits
 1) Deposits in Japan
 2) Deposits in the Korean Peninsula
5. Bedded Cupriferous Iron Sulfide-Type Deposits (Besshi-Type Deposits)
6. Alaakite-Type Deposits
7. Sulfide-Rich and Sulfide-Poor Deposits
Chapter III     Mode of Occurrence of Electrum and Associated Minerals
1. Epithermal-Type Deposits
2. Hypo/Mesothermal Vein-Type Deposits
3. Kuroko-Type Deposits
4. Bedded Cupriferous Iron Sulfide-Type Deposits
5. Skarn-Type Deposits
6. Alaskite-Type Deposits
Chapter IV     Chemical Composition of Electrum
1. Ag Content
2. Contents of Other Elements
Chapter V     Factors Controlling Chemical Compositions of Electrum
1. Ag Content
 1) Factors Controlling Ag Content
 2) Temperature
 3) Salinity
 4) pH
 5) Activities of H2S, S2 and O2
 6) Minerals Coexisting with Electrum
 7) Thermochemical Mixing Properties
2. Contents of Other Elements
Chapter VI     Physicochemical Environment of Au-Ag Mineralization
1. Activity of Sulfur and Temperature
2. ∑Au/∑Ag
Chapter VII     Summary and Conclusions
Acknowledgments
References



Naotatsu Shikazono
Geological Institute, Faculty of Science, University of Tokyo
Masaaki Shimizu
University Museum, University of Tokyo


Index page