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What is the difference between regional and contact metamorphism?
Regional metamorphism is the creation of metamorphic rock from large geographically significant processes like plate tectonics. Contact metamorphism is the creation of metamorphic rock from the proximity of an existing rock to a heat source provided by a plutonic intrusion.
Unlike regional metamorphism contact metamorphism occurs when?
Both contact and regional metamorphism result in new types of rock from pre-existing types of rock whether it be from recrystallization, new crystal formation, or realignment of existing minerals.
Is the largest quantity of metamorphic rock produced by regional metamorphism?
True
What kind of metamorphism occurs when intrusive magma forms a sill between two sedimentary rock strata?
contact metamorphism
Is gneiss an example of igneous rock?
No. Gneiss is a metamorphic rock.
What rock forms at the lowest grade of regional metamorphism?
Slate is the rock that forms at the lowest grade of regional metamorphism. With increased metamorphic grade, slate can further transition into phyllite, then schist, and finally gneiss.
What type of rock would result from the metamorphism of granite?
The metamorphism of granite would likely result in the formation of gneiss, a coarse-grained foliated rock with distinct bands of minerals. The high temperature and pressure during metamorphism would cause the minerals in the granite to recrystallize and align, giving gneiss its characteristic banded appearance.
What is the difference between regional and contact metamorphism?
Regional metamorphism is the creation of metamorphic rock from large geographically significant processes like plate tectonics. Contact metamorphism is the creation of metamorphic rock from the proximity of an existing rock to a heat source provided by a plutonic intrusion.
What two geological processes are involved in changing sedimentary rock to a metamorphic rock?
The two processes resulting from sedimentary into metamorphic rock are known as contact metamorphism and regional metamorphism. Regional metamorphism most notably involves two tectonic plates colliding, while contact metamorphism occurs due to the intrusion of magma.
Why are metamorphic rocksformed by contact metamorphism usually not as dense as those formed by regional metamorphism?
Because contact metamorphism usually occurs because of an increase in temperature. In contrary, regional metamorphism is usually the result of compression. Compression makes a rock more dense.
What are the types of rock metamorphism?
Types of metamorphism are Contact Metamorphism Regional Metamorphism Cataclastic Metamorphism Hydrothermal Metamorphism Burial Metamorphism Shock Metamorphism (Impact Metamorphism)
How do the effects of contact metamorphism compare with those of regional metamorphism?
Contact metamorphism occurs locally along the edges of intrusions and is characterized by high temperatures but relatively low pressures, resulting in the formation of non-foliated rocks like marble and quartzite. In contrast, regional metamorphism occurs over large areas due to tectonic forces, leading to both high temperatures and pressures that cause the formation of foliated rocks like schist and gneiss.
What is a common parent rock for slate and gneiss?
Shale is a common parent rock for both slate and gneiss. Slate forms from the metamorphism of fine-grained sedimentary rocks like shale, while gneiss forms from the metamorphism of various rock types including shale.
which rock is only formed by regional metamorphasim?
The heat generated by the magma chamber has changed these sedimentary rocks into the metamorphic rocks marble, quartzite, and hornfels. Regional Metamorphism occurs over a much larger area. This metamorphism produces rocks such as gneiss and schist.
Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by reg?
Because in contact the rock actually comes in contact with magma, this joins with the rock, so when it cools and become igneous rock, it's denser. In regular, or regional, the rock is formed from intense heat and pressure, but does not actually come in contact with magma.
What rocks are formed by changes in heat and pressure or the pressure of hot watery fluids?
Metamorphic Rocks are formed two ways: Regional Metamorphism Contact Metamorphism In regional, two plates collide and through pressure and friction to change igneous rock to metamorphic. In contact (more familiar to me) lava (hot liquid?) contacts any type of rock and doesn't not melt but sorta loosens it up so the crystals inside can rearrange.
Compare contact thermal metamorphism and regional dynothermal metamorphism and the types of rocks that result from each?
Contact metamorphism occurs locally, next to igneous intrusions and along fractures that were in contact with hydrothermal fluids. Regional metamorphism occurs over very large areas, such as deep within the cores of rising mountain ranges, and generally occurs with the folding of rock layers. Both result in the formation of metamorphic rocks.
