Transcription of FOLDS - ETH Z
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FOLDS - ETH Z
207 FOLDS jpb, 2020 FOLDS The term fold is used when one or stacks of originally flat and planar surfaces such as sedimentary beds become bent or curved as a result of plastic ( permanent) and ductile deformation. FOLDS in rocks vary in size from microscopic crinkles to mountain-size FOLDS . They occur singly as isolated FOLDS and in extensive fold trains at all scales. A set of FOLDS distributed on a regional scale constitutes a fold belt. Fold belts are typically associated with convergent plate boundaries and directed compressive stress.
Buckle folding may also affect the planar interface between materials of contrasting viscosity. When this occurs, the folds have a characteristic form; those closing in one direction have a broad rounded shape (lobate folds) and hi nges closing in the opposite direction have a narrow or cuspate shape. The cusps
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