Metamorphism and Metamorphic Rocks (GEO 100) – Flashcards
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Forms during the highest grade of regional metamorphism.
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Schist
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What is the major source of heat for contact metamorphism?
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Heat from a nearby magma body
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What metamorphic rock forms during the metamorphism of limestone or dolostone?
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Marble
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What term describes a strong, parallel alignment of coarse mica flakes and/or of different bands in a metamorphic rock?
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Foliation
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Is characterized by the segregation of light- and dark-colored minerals into thin layers or bands?
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Granitic gneiss
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What metamorphic rock forms from sandstone?
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Quartize
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Foliated metamorphic rocks in the order of increasing grain size and increasing grade of metamorphism.
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Slate, phyllite, and schist
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Slate
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1. Slate forms from shales and mudstones.
2. In slate, rock cleavage is common.
3. Sedimentary features may be visible in slates.
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Which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well developed rock cleavage?
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Slate
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What type of metamorphic facies associated with the subduction of oceanic crust and sediments forms at very high pressure but moderately low temperature?
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Blueschist
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What platy, parallel mineral grains are the most visual aspect of foliated metamorphic rocks?
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Micas
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What metamorphic environment produces tektites?
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High temperatures associated with meteorite impacts
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What foliated, metamorphic rock is texturally intermediate between slate and schist?
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Phyllite
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What major change occurs during metamorphism of limestone to marble?
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Calcite grains increase in size.
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Genetically associated with impact of an asteroid or large meteorite.
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1. Tektites
2. Coesite
3. Impact Crater
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Contact Metamorphism
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Pressures are fairly low, the rock may be in the upper part of the crust, and heat is supplied from a nearby magma body such as a pluton, dike, or sill.
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In which setting would regional metamorphism be most likely?
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At great depths in the crust where two continents are colliding.
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The zone of contact metamorphism that surrounds an intrusive magma body.
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Aureole
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Which of the following situations would exhibit sheared and mechanically fragmented rocks?
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Fault movements at shallow depths
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During metamorphism, what is the major effect of chemically active fluids?
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They aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains.
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What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock?
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Schistosity
