Field Geology of High-Grade Gneiss Terrains
(Sprache: Englisch)
This is the first textbook on structural geology aimed primarily at the interpretation of high-grade gneiss terrains. The authors outline some of the more commonly seen structural features, suggest how they can be analysed and interpreted, and explain which...
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This is the first textbook on structural geology aimed primarily at the interpretation of high-grade gneiss terrains. The authors outline some of the more commonly seen structural features, suggest how they can be analysed and interpreted, and explain which sampling technique for petrology, geochemistry and geochronology will give the best results. The text is lavishly illustrated with line drawings and photographs, and features chapters on "Mapping in Gneiss Terrains", "Fabric Development", "Interpretation of Structures and Fabrics", "Metamorphic History of Gneiss Terrains", "Geochemistry, Isotope Geochemistry and Geochronology", and "Origin and Evolution of High-Grade Gneiss Terrains". A "Problem Section" includes illustrated examples of structures that are difficult to interpret and which allow readers to test their skills.
Klappentext zu „Field Geology of High-Grade Gneiss Terrains “
Although there are numerous publications on the geology of high-grade gneiss terrains, few descriptions exist of how to map and carry out structural analysis in these terrains. Textbooks on structural geology concentrate on technIques appli cable to low-grade terrains. Geologists who have no experience of mapping high-grade gneisses are often at a loss as to how to apply techniques to high grade rocks that were developed for low to medium grade metamorphic terrains. Any study of deep crustal processes and their development through time should begin with examination of the primary data source - outcrops of high grade metamorphic terrains. We feel that the urge to apply advanced techniques of fabric analysis, petrology, geochemistry, isotope geochemistry and age deter mination to these rocks often results in brief sampling trips in which there is little, if any analysis of the structural and metamorphic history revealed by outcrop patterns. Many studies of the metamorphic petrology and geochemistry of high-grade gneiss terrains make ineffective use of available field data, often because the authors are unaware of structural complexities and of the ways to recognise and use them. This is unfortunate, because much data can be collected in the field at minimal cost that cannot easily, if at all, be obtained from material in the laboratory. The primary igneous or sedimentary nature of a rock, the relative age of intrusive veins, and the sequence of deformation that they under went, can usually best be determined by straightforward observation in the field.
Inhaltsverzeichnis zu „Field Geology of High-Grade Gneiss Terrains “
1 Introduction.- 2 Mapping in Gneiss Terrains.- 2.1 Introduction.- 2.2 General Problems.- 2.3 Working Method.- 2.4 Outcrop Analysis.- 2.5 What to Map.- 2.6 Types of Maps 7..- 2.7 Scheme of Events.- 2.8 Sampling.- 3 Fabric Development in Gneiss Terrains.- 3.1 Introduction.- 3.2 The Geometry of Ductile Flow in Rocks.- 3.3 Fabric Elements.- 3.4 Shear Zones in High-Grade Conditions.- 3.5 Fabric Distribution in Shear Zones.- 4 Interpretation of Structures and Fabrics.- 4.1 The Inadequate Memory of Rocks.- 4.2 Igneous or Sedimentary Origin of Gneisses.- 4.3 Assessment of Strain Intensity.- 4.4 Shear Zones.- 4.5 Folds and Boudins.- 4.6 Overprinting Relations Involving Folds and Boudins.- 4.7 Overprinting Relations Involving Intrusions.- 4.8 Outcrop Surface and Fabric Patterns.- 5 Metamorphic History of Gneiss Terrains.- 5.1 Introduction.- 5.2 Metamorphic History.- 5.3 Fabric Evidence for Metamorphic History.- 5.4 Metamorphic Conditions.- 5.5 Sites to Study Retrogression Fabrics.- 5.6 Relative Dating of Metamorphic Events.- 5.7 Isograd Patterns.- 5.8 Geothermobarometry.- 6 Geochemistry, Isotope Geochemistry and Geoehronology: Application to Field Studies.- 6.1 Introduction.- 6.2 Geochemistry.- 6.3 Isotope Geochemistry.- 6.4 Geochronology.- 7 Origin and Evolution of High-Grade Gneiss Terrains.- 7.1 Introduction.- 7.2 Two Kinds of Gneiss Terrain.- 7.3 Crustal Structure of Gneiss Terrains.- 7.4 Origin and Evolution of High-Grade Gneiss Terrains.- 8 Problem Section.- 8.1 Introduction.- 8.2 Informative Misinterpretations.- 8.3 Problems.- 9 References.- 10 Index.
Bibliographische Angaben
- Autoren: Cees W. Passchier , John S. Myers , Alfred Kröner
- 1990, 1990, IX, 150 Seiten, Maße: 17,1 x 24,3 cm, Kartoniert (TB), Englisch
- Verlag: Springer, Berlin
- ISBN-10: 3540530533
- ISBN-13: 9783540530534
Sprache:
Englisch
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