Most regional metamorphism takes place within continental crust.
Exam 2 Chapter 8 Flashcards – Quizlet
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What setting would a metamorphic rock most likely form?
Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
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Where can you find regional metamorphism?
Regional metamorphic rocks occur where rocks are altered by high temperatures and / or high pressures usually deep within the Earth. Regional metamorphism can affect large volumes of the crust and typically happens at convergent plate boundaries, beneath new mountain ranges.
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In which environment does metamorphism mostly occur?
Most metamorphic rocks occur in fold mountain belts or cratonic areas. Such rocks cover large areas of the Earth’s crust and are therefore termed regional metamorphic rocks. They arise by the combined action of heat, burial pressure, differential stress, strain and fluids on pre-existing rocks.
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What is the most likely location to find metamorphic rocks formed by regional metamorphism?
We often find metamorphic rocks in mountain ranges where high pressures squeezed the rocks together and they piled up to form ranges such as the Himalayas, Alps, and the Rocky Mountains. Metamorphic rocks are forming deep in the core of these mountain ranges.
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What are the metamorphic settings?
Metamorphism, therefore occurs at temperatures and pressures higher than 200oC and 300 MPa. Rocks can be subjected to these higher temperatures and pressures as they are buried deeper in the Earth. Such burial usually takes place as a result of tectonic processes such as continental collisions or subduction.
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Where does most metamorphic occur?
Most metamorphic rocks occur in fold mountain belts or cratonic areas. Such rocks cover large areas of the Earth’s crust and are therefore termed regional metamorphic rocks. They arise by the combined action of heat, burial pressure, differential stress, strain and fluids on pre-existing rocks.
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In what geologic setting are foliated metamorphic rocks formed?
Foliation is common in rocks affected by the regional metamorphic compression typical of areas of mountain belt formation (orogenic belts).
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Where are contact metamorphic rocks most likely to form?
Contact metamorphism is usually restricted to relatively shallow depths (low pressure) in the Earth because it is only at shallow depths where there will be a large contrast in temperature between the intruding magma and the surrounding country rock.
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Where might you find regional metamorphic rocks being formed?
As described above, regional metamorphism occurs when rocks are buried deep in the crust. This is commonly associated with convergent plate boundaries and the formation of mountain ranges.
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Where is regional metamorphism most likely to occur?
Most regional metamorphism takes place within continental crust. While rocks can be metamorphosed at depth in most areas, the potential for metamorphism is greatest in the roots of mountain ranges where there is a strong likelihood for burial of relatively young sedimentary rock to great depths.
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What are some examples of regional metamorphism?
Regionally metamorphosed rocks usually have a squashed, or foliated appearance – examples include slate, schist and gneiss (pronounced “nice”), formed by metamorphism of mudstones, and also marble which is formed by metamorphism of limestone.
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Where can you find contact metamorphism?
Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma.
