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