Abstract
The principles and relative chronology of polyphase deformation and polyphase metamorphism first developed mainly in Scotland and North America and later spread to many parts of the world. By the mid-1960s a distinct sequential terminology was introduced for phases of deformation, foliation, lineation, and metamorphism. Yet even now, doubts and uncertainties exist and certain geometric mechanisms, such as rotation on vertical axes, are both asserted and denied. In the process of rapid development of ideas on polyphase deformation, disputes originated because of difficulties in defining and demonstrating various geometric and time relationships.
Investigations in various metamorphic belts have brought to light the possibilities of polyorogenic and mono-orogenic deformation. With regard to polyphase metamorphism, it was soon found that this type of metamorphism exists in many belts, but that the interpretation often depends on individual investigators.
Recently attempts have been made to date the duration of metamorphic episodes. One of the principal problems associated with the studies of polyphase orogenic structures has been the interpretation of the behaviour of polyphyroblasts during metamorphism. The dispute partly arises, as is suggested in the paper, because the deformation style of wide orogenic regions is confused with that associated with narrow zones of shear and mylonitization.
Since the events under consideration are evidently related to episodes of deformation, now related to plate tectonics, attention is drawn to the fact that regions where polyorogenic deformations have taken place are enigmatic since they appear to be in conflict with the idea of rapid continental movements. More information is essential.
Acknowledgements: I should like to acknowledge discussions with Professor J. W. Skehan of Boston College, who has made many valuable comments. Thanks are also due to Daniel Phelps, my friend and assistant, who has helped with the preparation of the manuscript, and to Dr S. Sengupta for editorial help.
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Rast, N. (1997). Continuous and discontinuous events in orogenic deformation. In: Sengupta, S. (eds) Evolution of Geological Structures in Micro- to Macro-scales. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5870-1_24
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