Term
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Definition
| small-scale penetrative features, defines the interrelationships between constituent phases in a rock |
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Term
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Definition
Inherited from original rock
"Blasto-"=relict
Any degree of preservation
Pseudomorphs of minerals or premetamorphic textures/structures |
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Term
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Definition
mechanical fragmentation and sliding, rotation of fragments
Technically not metamorphic (rarely occurs alone) |
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Term
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Definition
| Highest strain areas near grain contacts. High-strain areas dissolve and material precipitates in adjacent low-strain areas. Pressure solution of results in a serrated solution surface in high-strain areas and precipitates in low-strain areas |
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Term
| Plastic intracrystalline deformation |
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Definition
no loss of cohesion
several processes may operate simultaneously: Defect migration, Slip planes, dislocation glide, deformation twinning |
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Term
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Definition
Loss of stored strain by vacancy migration, dislocation migration and annihilation
Polygonization: general term for formuation of low-strain subgrains |
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Term
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Definition
| Grain boundary migration, subgrain rotation, solid-state diffusion creep at higher T, Crystalplastic deformation |
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Term
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Definition
| recovery and recrystallization by which large grains form by the addition of smaller strained grains by grain boundary migration |
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Term
| High-Strain metamorphic textures |
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Definition
Break, Crack, bend, crush, rotate
Slip and shredding of phyllosilicates
Clasts-broken remnants
Porphyroclasts-larger remnant in finer crush matrix
Pseudotachylite |
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