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Proterozoic crustal evolution /
As a final product of the International Geological Correlation Program (IGCP) Project 217, this volume brings together significant advances in the understanding of Proterozoic crustal evolution. This IGCP Project focussed on nine research objectives: 1) Comparison of Archean and Proterozoic supracru...
| Clasificación: | Libro Electrónico |
|---|---|
| Otros Autores: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Amsterdam ; New York :
Elsevier,
1992.
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| Colección: | Developments in Precambrian geology ;
10. |
| Temas: | |
| Acceso en línea: | Texto completo Texto completo |
Tabla de Contenidos:
- Front Cover; Proterozoic Crustal Evolution; CONTENTS; Contributing authors; INTRODUCTION; Reference; CHAPTER 1. VOLCANIC ROCKS OF EARLY PROTEROZOIC GREENSTONE BELTS; Introduction; Methods; Early Proterozoic greenstone belts; Discussion and conclusions; Acknowledgements; References; CHAPTER 2. THE PROTEROZOIC OPHIOLITE PROBLEM; Introduction; Problem of preservation of Proterozoic ophiolites; Pan-African ophiolites; Early Proterozoic ophiolites; Diversity of Proterozoic ophiolites; Ophiolite analogues in Archean greenstone belts?; Acknowledgements; References; CHAPTER 3. PROTEROZOIC RIFTS
- IntroductionEarly Proterozoic rifts: 2.5-1.9 Ga; Early to Middle Proterozoic rifts: 2.0-1.5 Ga; Middle Proterozoic rifts: 1.5-1.0 Ga; Middle to Late Proterozoic rifts: 1.0-0.6 Ga; Proterozoic rifts and plate tectonics; References; CHAPTER 4. GEOCHEMISTRY AND SIGNIFICANCE OF MAFIC DYKE SWARMS IN THE PROTEROZOIC; Introduction; Form and features; Chronology; Petrological characteristics; Geochemistry; Mantle evolution; Thermal problems in dyke generation; Comparison with continental flood basalts; Conclusions; Acknowledgements; References
- CHAPTER 5. TECTONIC SETTING OF PROTEROZOIC LAYERED INTRUSIONS WITH SPECIAL REFERENCE TO THE BUSHVELD COMPLEXIntroduction; Tectonic setting and parental magmas of rift-related Proterozoic layered complexes; The Bushveld Complex and related magmatic events; Discussions and conclusions; Acknowledgements; References; CHAPTER 6. PROTEROZOIC ANORTHOSITE COMPLEXES; Introduction; Composition and rock nomenclature; Size and shape of anorthosite massifs; Comparison with Archean and other anorthosites; Distribution; Geologic setting; Isotopic ages; Internal constitution of massif anorthosite complexes
- Characteristics of anorthositic plutons and associated dikesMineralogy; Geochemistry; Nd, Sr, and Pb isotopic compositions; Oxygen isotopes; Diorites; Granitic rocks; Fe-Ti oxide deposits; Late basaltic dikes; The generation of massif-type anorthosites; Acknowledgements; References; CHAPTER 7. THE ROLE OF ANOROGENIC GRANITES IN THE PROTEROZOIC CRUSTAL DEVELOPMENT OF NORTH AMERICA; Introduction; Anorogenic magmatism of North America; Compositional variations amongest anorogenic granites; Initial Sr and Nd isotopes; Oxygen isotopic compositions; Conditions of crystallization
- Anorogenic or epizonal?Source of granitic melts; Origin of anorogenic magmatism: rifts, plumes, and superswells; Acknowledgemcnts; References; CHAPTER 8. PROTEROZOIC GRANULITE TERRANES; Introduction; Modes of occurrence and time-space distribution; Structural styles and sequences; Complexity in structural and metamorphic evolution: the role of reworking; Pressure-temperature conditions of Proterozoic granulite terranes; Pressure-temperature paths; Roles and significance of fluids and melts; Some remarks on tectonic models for Proterozoic granulites; Acknowledgements; References