Articles liés à Strain Facies
Synopsis
I. Introduction.- Sketch of Trollheimen.- Acknowledgments.- II. Twelve Properties of Mesoscopic Folds.- Definitions.- Properties of an Individual Fold.- 1. Type of Geometry.- 2. Nature of Hinge and Limbs.- 3. Ratio of Short-Limb Height to Width.- 4. Ratio of Depth to Width.- 5. Length and Character of Hinge Line.- 6. Cylindricity.- 7. Relation to Cleavage.- 8. Relation to Mineral Lineation.- Properties of a Group of Folds.- 9. Mean and Standard Deviation of Ratios of Short-Limb Height to Width.- 10. Mean of Ratios of Depth to Width.- 11. Preferred Orientation of Fold Axes.- 12. Asymmetry.- Names of Folds According to Style.- III. Methods of Deducing Slip-Line Orientations from the Geometry of Folds.- Slip Folding of a Preexisting Straight Lineation.- Interference Structures from Superposed Slip Folds.- Asymmetry and the Separation Angle.- Flexural-Slip Folds in Planar Layers.- Tundra Landslide.- General Analysis.- Slip Folds in Planar Layers.- Superposed Slip Folds of a Single Order; the Hinge-Line Node.- Superposed Slip Folds of Multiple Orders.- Use of the Separation Angle.- IV. Geometric Types of Flow.- Definitions.- Correlation with Strain Features.- V. Trollheimen's Rock Units.- VI. The Sahlfold Fades.- Macroscopic Folds in Riar Basin.- Mesoscopic Structures in Riar Basin.- Mineral Lineation.- Elongate Augen.- Boudinage.- Sahlfolds.- Tubular Folds: Interference Structures.- Area A.- Area B.- Area C.- Comparison of Data.- Implications for Sahlfolding.- The Form of Riar Basin.- Anticline Hypothesis.- Synform Hypothesis.- Choice of the Synform Hypothesis.- Flow Environment of the Sahlfold Facies.- Essential Characteristics of the Flow.- Relative Orientations of Fabric and Kinematic Axes.- Subordinate Characteristics of the Flow.- Remarks on the Mechanism of Sahlfold Development Ill.- VII. The Norfold Facies.- Norfolds.- Spatial Relations of Norfolds in Trollheimen.- Configuration of Axial Surfaces.- Comparison of Norfold Orientations with Earlier.- Structures.- Axial Surfaces; the Asymmetry of Norfolds.- Fold Axes.- Conclusions on Norfold Affinities.- Rotation Paths of Early Lineations.- Six Folds in Area F.- Summary of Relationships in Nine Areas.- Mechanisms of Norfold Development.- Mean Slip-Line Orientations.- Kinematic Significance of Fold Axes and Zone.- Axes of Axial Surfaces.- Regional Pattern of Slip-Line Orientations.- Flow Environment of the Norfold Facies.- Restrictions from the Configuration of Riar Basin...- Other Considerations.- VIII. The Discfold Facies.- Macroscopic Structures of the Svaho Border Zone.- Faults and the Zone Boundaries.- The Hammerhø Synform.- A System of Flexures.- Mesoscopic Structures in the Svah0 Border Zone.- The Regional Mineral Lineation.- Elongate Augen.- Boudinage.- Hammerhø Synform Folds.- Lang Tjern Folds.- Høghø Folds.- Interference Structures.- Discfolds.- Mode of Discfold Development.- Slip-Line Orientations in the Svahø Border Zone.- Discfold Movement.- Other Movement.- Summary of Relationships between Fabric and Kinematics.- Nappe Emplacement.- Flow Environment of the Discfold Facies.- Relative Orientations of Fabric and Kinematic Axes.- Flow Characteristics.- IX. The Concept of Strain Facies.- Comparison of Three Fold Types.- Sahlfolds and Discfolds.- Norfolds and Discfolds.- Sahlfolds and Norfolds.- Rationale for Strain Facies.- Some General Remarks.- References.- Author and Subject Index.
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