1 Textures of Regional Textures of Regional Metamorphism Metamorphism F Dynamothermal Dynamothermal (crystallization under (crystallization under dynamic conditions) dynamic conditions) F Orogeny Orogeny- long long- term mountain term mountain-building building s May comprise several Tectonic Events May comprise several Tectonic Events i May have several Deformational May have several Deformational Phases Phases F May have an accompanying Metamorphic May have an accompanying Metamorphic Cycles with one or more Reaction Events Cycles with one or more Reaction Events Progressive Progressive syntectonic syntectonic metamorphism of metamorphism of a volcanic a volcanic graywacke, New graywacke, New Zealand. Zealand. From From Best Best (1982). (1982). Igneous and Igneous and Metamorphic Metamorphic Petrology Petrology. W. H. . W. H. Freeman. San Freeman. San Francisco. Francisco. Progressive syntectonic metamorphism of a volcanic graywacke, New Zealand. From Best (1982). Igneous and Metamorphic Petrology . W. H. Freeman. San Francisco. Progressive syntectonic metamorphism of a volcanic graywacke, New Zealand. From Best (1982). Igneous and Metamorphic Petrology . W. H. Freeman. San Francisco. Progressive syntectonic metamorphism of a volcanic graywacke, New Zealand. From Best (1982). Igneous and Metamorphic Petrology . W. H. Freeman. San Francisco. Fig 23 Fig 23-21 Types of foliations 21 Types of foliations a. a. Compositional layering Compositional layering b. b. Preferred orientation of platy Preferred orientation of platy minerals minerals c. c. Shape of deformed grains Shape of deformed grains d. d. Grain size variation Grain size variation e. e. Preferred orientation of platy Preferred orientation of platy minerals in a matrix without minerals in a matrix without preferred orientation preferred orientation f. f. Preferred orientation of lenticular Preferred orientation of lenticular mineral aggregates mineral aggregates g. g. Preferred orientation of fractures Preferred orientation of fractures h. h. Combinations of the above Combinations of the above Figure 23-21. Types of fabric elements that may define a foliation. From Turner and Weiss (1963) and Passchier and Trouw (1996).
Textures of Regional Metamorphism
Jun 23, 2023
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