Where does metamorphism take place?
Dynamic metamorphism takes place anywhere that faulting occurs at depth in the crust. Thus, mylonites can be found at all plate boundaries, in rifts, and in collision zones.
What is sea floor metamorphism?
Ocean-floor metamorphism is a concept that has arisen from recent studies of present oceanic ridges and fracture zones where new crust is being generated, altered, and deformed.
What type of metamorphism occurs at mid ocean ridges?
Hydrothermal Metamorphism (Fig. 8.3): typically occurs along mid-ocean ridge spreading centers where heated seawater percolates through hot, fractured basalt. Chemical reactions between the heated seawater and basalt result in metamorphism of the basalt.
Where does subduction metamorphism occur?
subduction zones Subduction Zone Metamorphism At subduction zones, where ocean lithosphere is forced down into the hot mantle, there is a unique combination of relatively low temperatures and very high pressures.
Where does contact metamorphism take place?
Contact metamorphism takes place where a body of magma intrudes into the upper part of the crust. Any type of magma body can lead to contact metamorphism, from a thin dyke to a large stock.
In which tectonic setting would contact metamorphism occur?
Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole.
At which location is dynamic metamorphism?
Dynamic metamorphic rocks are restricted to narrow zones adjacent to faults or thrusts. The high shear stresses associated with faults and thrusts crush the adjacent rocks. The rise in temperature is produced by frictional heat generated within the fault zone.
Where would contact metamorphism most likely occur?
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.
What process contributes to metamorphism of oceanic crust at a spreading ridge?
Almost all regions that experience metamorphism are being acted upon by plate-tectonic processes. Oceanic crustal rock can be metamorphosed near the spreading ridge where it was formed. Regional metamorphism takes place in areas where mountain ranges are forming, which are most common at convergent boundaries.
Which type of metamorphism is found at a divergent plate boundary?
Contact metamorphism Contact metamorphism is common at both convergent and divergent plate boundaries, in areas where molten rock is produced. Regional metamorphism largely occurs at convergent plate boundaries. Each of these types of metamorphism produces typical metamorphic rocks, but they may occur in different sequences.
What metamorphism occurs at divergent boundaries?
Ocean-ridge metamorphism takes place at mid-oceanic ridges in response to sea floor spreading. The plate tectonic setting is therefore characterized by a divergent plate boundary regime. This metamorphism is attributed to the high heat flow and intense fluid circulation that occurs along oceanic ridges.
What plate boundary does metamorphism occur?
convergent plate boundaries Contact metamorphism is common at both convergent and divergent plate boundaries, in areas where molten rock is produced. Regional metamorphism largely occurs at convergent plate boundaries. Each of these types of metamorphism produces typical metamorphic rocks, but they may occur in different sequences.
Which metamorphism is found in shear fault zones?
Dynamic metamorphism The high shear stresses associated with faults and thrusts crush the adjacent rocks. The rise in temperature is produced by frictional heat generated within the fault zone.
Why do metamorphic rocks form at ocean ocean divergent boundaries?
Metamorphic Rocks and Plate Boundaries Metamorphic rocks that form because they are exposed to heat from magma form at the same plate boundaries igneous rocks form: divergent, ocean–ocean convergent, and ocean–continent convergent boundaries. These types of metamorphic rocks can also form at hot spots.
What are the type of metamorphism differentiate these three types in terms of the location where it happens occurs and the factor that causes the metamorphism?
The three types of metamorphism are Contact, Regional, and Dynamic metamorphism. Contact Metamorphism occurs when magma comes in contact with an already existing body of rock. When this happens the existing rocks temperature rises and also becomes infiltrated with fluid from the magma.
Where are most metamorphic rocks formed?
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.
What types of metamorphism occur at each plate boundary?
Contact metamorphism is common at both convergent and divergent plate boundaries, in areas where molten rock is produced. Regional metamorphism largely occurs at convergent plate boundaries. Each of these types of metamorphism produces typical metamorphic rocks, but they may occur in different sequences.
In which location would you be most likely to find a metamorphic rock?
This often occurs deep in the Earth or near magma underground. 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.
At which location is contact metamorphism least likely to occur?
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.
At which location are metamorphic rocks most likely forming?
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.
Where do most metamorphic rocks form quizlet?
Most metamorphic rocks form deep underground. They form under extreme heat and pressure. This is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids.
Do most metamorphic rocks form near Earth’s surface?
Although metamorphic rocks typically form deep in the planet's crust, they are often exposed on the surface of the Earth. This happens due to geologic uplift and the erosion of the rock and soil above them. At the surface, metamorphic rocks will be exposed to weathering processes and may break down into sediment.
In which location are you most likely to find contact metamorphism occurring?
In which location are you most likely to find contact metamorphism occurring? The Cascade Mountains.
At which location is contact metamorphism?
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.
Why do metamorphic rocks form at subduction zones?
The descending of rock layers at subduction zones causes metamorphism in two ways; the shearing effect of the plates sliding past each other causes the rocks coming in contact with the descending rocks to change. Some of the descending rock will melt because of this friction.
What type of plate boundary is metamorphism most common?
convergent plate boundaries Regional metamorphism largely occurs at convergent plate boundaries. Each of these types of metamorphism produces typical metamorphic rocks, but they may occur in different sequences.
Which rock is formed only by regional metamorphism?
Regional metamorphism usually produces foliated rocks such as gneiss and schist.
Which types of rock can form below Earth’s surface?
Intrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth.
What tectonic environment does contact metamorphism usually take place?
Contact metamorphism is thus primarily a thermal phenomenon. It may occur in diverse tectonic settings such as in orogenic or anorogenic environments, in plate interiors or along plate margins.
Where are you most likely to find metamorphic rocks?
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.