chapter 8 metamorphism
Terms
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- aureole, p 257
- a zone or halo of contact metamorphism found in the country rock surrounding an ingeous intrusion
- burial metamorphism, p 260
- a low-grade of metamorphis occurring in the lowers layers of very thick sedimentary accummulations
- confining pressure, p 257
- an equal, all-sided pressure
- contact metamorphism, p 257
- changes in rock caused by the heat from a nearby magma body
- differential stress, p 250
- forces that are unequal in different directions
- foliation, p 250
- the linear arrangement of textural features seen in metamorphic rocks
- gneissic texture, p 253
- a texture of metamorphic rocks where light and dark silicate minerals are separated, giving the rock a banded appearance
- hydrothermal metamorphism, p 258
- chemical alterations ocurring as hot, chemically-active water circulates through fractures in a rock
- hydrothermal solution, p 258
- the hot watery solution escaping from a mass of magma. These solutions alter neighboring country rock.
- impact metamorphism, p 261
- changes in rock caused by the high pressures and temperatures accompanying the impact of a meteorite, comet, or asteroid
- metasomatism, p 249
- a complete change in the overall mineral composition of a rock produced by chemically active fluids
- migmatite, p 264
- OMIT
- nonfoliated texture, p 253
- any texture in metamorphic rocks that lack folication
- parent rock, p 244
- the original rock from which a metamorphic rock formed
- porhyroblastic texture, p 253
- a texture of metamorphic roks in which particularly large grains (porphyroblasts) are surrounded by a fine-grained matrix of other minerals
- regional metamorphism, p 260
- metamorphism associated with large scale mountain building
- rock cleavage, p 251
- OMIT
- schistosity, p 252
- a type of foliation characteristic of coarser-grained metamorphic rocks. Such rocks have a parallel arrangement of platy minerals such as mica.
- shield, p 265
- OMIT
- slaty cleavage, p 250
- a type of foliation in metamorphic rocks where there is a parallel arrangement of fine-grained metamorphic minerals.
- texture, p 250
- the size, shape and distribution of the particles in a rock
- thermal metamorphism, p 257
- same as contact metamorphism
- boudinage
- structure in which brittle beds bounded by more ductile ones have been divided into segments during metamorphism