What type of metamorphism occurs at a subduction zone?
Subduction zone metamorphism is characterized by a low temperature, high-ultrahigh pressure metamorphic path through the zeolite, prehnite-pumpellyite, blueschist, and eclogite facies stability zones of subducted oceanic crust.
What type of metamorphism occurs at low pressure?
Low-grade metamorphism takes place at temperatures between about 200 to 320oC, and relatively low pressure. Low grade metamorphic rocks are generally characterized by an abundance of hydrous minerals.
What is low grade regional metamorphism?
Regional low-grade metamorphism takes place with a small increase in temperature (above 200 °C) at significantly increased directional pressure. The level of precrystallization of primary minerals witness very weak changes under the increase of only directed pressure and low temperature.
What type of metamorphism occurs at low temperature and high-pressure?
Three types of metamorphism exist: contact, dynamic, and regional. Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism. Conversely, decreasing temperatures and pressure characterize retrograde metamorphism.
What are the 3 main types of 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.
What is the difference between foliated and Nonfoliated metamorphic rock?
Foliated metamorphic rocks exhibit layers or stripes caused by the elongation and alignment of minerals in the rock as it undergoes metamorphism. In contrast, nonfoliated metamorphic rocks do not contain minerals that align during metamorphism and do not appear layered.
What will happen if a mudstone undergoes metamorphism?
The mudstone probably would melt. (b) Low grade rocks are going to be composed largely of slates, phyllites, and schists while intermediate grade rocks are going to be schists and gneisses.
What is the difference between low grade and high grade metamorphism?
Low-grade metamorphic rocks tend to be fine-grained (the newly formed metamorphic mineral grains that is). High-grade metamorphic rocks tend to be coarse-grained. Foliation in metamorphic rocks is related to the orientation of the applied stresses and not the original sedimentary or earlier metamorphic structures.
What is regional metamorphism?
Regional metamorphism is metamorphism that occurs over broad areas of the crust. Most regionally metamorphosed rocks occur in areas that have undergone deformation during an orogenic event resulting in mountain belts that have since been eroded to expose the metamorphic rocks.
What is most likely type of metamorphism to occur with a subducting plate?
Subduction takes the rocks to great depth in the Earth relatively quickly. This produces a characteristic type of metamorphism, sometimes called high-pressure, low-temperature (high-P, low-T) metamorphism, which only occurs deep in a subduction zone.
What happens in a subduction zone?
Subduction zones are plate tectonic boundaries where two plates converge, and one plate is thrust beneath the other. This process results in geohazards, such as earthquakes and volcanoes. Earthquakes are caused by movement over an area of the plate interface called the seismogenic zone.