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TITLE	Geochemical and Tectonic Evolution of Arc-Backarc Hydrothermal Systems
ISBN	0-444-51150-4
URL	Hyperlink
AUTHORS	Shikazono, N.
EDITION
VOLUME
PAGES	466
IMPRINT	Elsevier
BINDING	HC
DESCRIPTION	Hardbound. In and nearby the Japanese islands many Neogene hydrothermal ore deposits have been formed from middle Miocene to present and many subaerial and submarine active geothermal systems occur. By integrating geological, mineralogical and geochemical data on the Kuroko-type and epithermal precious and base metal vein-type deposits, genesis, depositional mechanism are discussed. Temporal and spatial relationship between two types of deposits and evolution of tectonics and hydrothermal systems associated with the mineralizations during Neogene age are considered. Geochemical, geological and mineralogical summary of active subaerial and submarine back arc basin hydrothermal systems and mineralizations is also given. The characteristic features of above-active subaerial and submarine hydrothermal systems are compared with fossil hydrothermal systems associated with epithermal vein-type and Kuroko-type deposits and the causes for the differences in th
PUBDATE	01-Apr-03
USD	165
Euro	165
REVIEW
TOC	Preface. 1. Miocene-pliocene hydrothermal ore deposits in and around the Japanese islands. 1.1. General overview of metallogeny and tectonics in the Japanese Islands. 1.2. General overview and classification of hydrothermal ore deposits of Neogene age. 1.3. Kuroko deposits. 1.3.1. Geological characteristics. 1.3.2. Mineralogical characteristics. 1.3.3. Geochemical. 1.3.4. Depositional mechanism and origin of ore fluids. 1.4. Epithermal vein-type deposits. 1.4.1. Geological characteristics. 1.4.2. Mineralogical characteristics. 1.4.3. Geochemical characteristics. 1.4.4. Se- and Te-type Au-Ag deposits. 1.4.5. Depositional mechanism and origin of ore fluids. 1.4.6. Hishikari deposit: an example of Japanese epithermal Au-Ag vein-type deposits. 1.5. Evolution of tectonics and hydrothermal system associated with epithermal and Kuroko mineralizations. 1.5.1. Paleogeography and stress field. 1.5.2. Volcanic activity. 1.5.3. Tectonic influence on temporal and spatial relationships in Kuroko and vein-type deposits in southern Hokkaido, Japan. 1.5.4. Geochemical features of sedimentary rocks formed in the Japan Sea as a proxy for hydrothermal activity. 1.5.5. Mode of subduction and formation of back-arc basin. 1.6. Other hydrothermal ore deposits. 1.6.1. Polymetallic vein-type deposits. 1.6.2. Hg and Sb deposits. 1.6.3. Gold-quartz vein-type deposits (mesothermal-hypothermal vein-type deposits). 1.6.4. Hot spring-type gold deposits. 2. Present-day mineralization and geothermal systems in and around the Japanese islands. 2.1. Subaerial geothermal system and mineralization. 2.1.1. Chemical compositions of geothermal waters controlled by hydrothermal alteration mineral assemblage. 2.1.2. Na-K-Ca geothermometer. 2.1.3. Present-day mineralization in subaerial geothermal areas in Japan. 2.2. Comparison of active geothermal systems with epithermal vein-type deposits. 2.2.1. Distribution. 2.2.2. Metals. 2.2.3. Mineralogy. 2.2.4. Geochemical features of hydrothermal fluids. 2.2.5. Geological and tectonic environment and volcanism. 2.3. Submarine geothermal systems and associated mineralization. 2.3.1. Submarine metal precipitation at back-arc basins around the Japanese islands. 2.3.2. Characteristics of back-arc deposits in the Western Pacific. 2.3.4. Comparison of present-day back-arc deposits with Kuroko deposits. 2.3.5. Spatial relationship between back-arc deposits and epithermal gold deposits. 2.4. Comparison of back-arc deposits with midoceanic ridge deposits. 2.4.1. Hydrothermal solution. 2.4.2. Metal ratios and mineralogy. 2.4.3. Mechanism of formation of chimney and ore deposits. 2.4.4. Hydrothermal alteration. 2.5. Besshi-type deposits in comparison with Kuroko deposits and midoceanic ridge deposits. 2.5.1. General features and classification. 2.5.2. Geological characteristics. 2.5.3. Metamorphism and hydrothermal alteration. 2.5.4. Mineralogical characteristics. 2.5.5. Geochemical features. 3. Hydrothermal flux from back arc basin and island arc and global geochemical cycle. 3.1. Major element (alkali, alkali earth, silica) flux. 3.2. Volatile element (CO2, S, As) flux. 3.2.1. CO2 flux. 3.2.2. Causes for high CO2 concentration and origin of CO2 of hydrothermal solution from back-arc basins. 3.2.3. S flux. 3.2.4. As flux. 3.3. Other elemental flux. 3.3.1. Hg flux. 3.3.2. Mn flux. 3.3.3. Ba flux. 3.4. Comparison of back-arc hydrothermal flux with midoceanic ridge hydrothermal flux. 4. Influence of hydrothermal CO2 flux on tertiary climate change. 4.1. Tertiary climate change in relation to CO2 flux by volcanic, hydrothermal and metamorphic activities. 4.2. Computation on global long-term carbon cycle and climate change. 5. Summary. Subject Index.
SUBJECT	Economic Geology
BOOK SERIES	Developments in Geochemistry
SUPER AREA	Earth and Planetary Sciences

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