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Why are metamorphic rocks formed by contact metamorphism usually not dense or resistant?
Metamorphic rocks formed by contact metamorphism are usually not dense or resistant because they are formed at relatively low pressures and temperatures compared to regional metamorphism. The short duration of the heating process in contact metamorphism does not allow for the recrystallization and reorganization of mineral structures that contribute to denser and more resistant rocks. Additionally, the presence of fluids and gases in contact metamorphism can facilitate alteration and weakening of the original rock material.
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.
Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by regional metamorphism?
Contact metamorphism does not cause profound compaction, which is the reduction in size of the spaces between mineral particles due to increases in pressure. Regional metamorphism causes compaction and possibly recrystallization, increasing the density of the rock.
What is the difference between slate and phyllite?
Slate is a fine-grained metamorphic rock formed from the low-grade metamorphism of shale or mudstone, while phyllite is a more intermediate-grade metamorphic rock formed from the metamorphism of slate. Phyllite has a more pronounced foliation and sheen due to increased metamorphic pressure and temperature compared to slate.
What type of rock is meta-conglomerate?
the meta conglomerate is a metamorphic rock it's mineral composition is from quartz & it has a non- foliated texture, it's formed via temprature (the agent of metamorphism) & the type of metamorphism is said to be "thermal" & the pre-metamorphic rock is conglomerate.
Why are metamorphic rocks formed by contact metamorphism usually not dense or resistant?
Metamorphic rocks formed by contact metamorphism are usually not dense or resistant because they are formed at relatively low pressures and temperatures compared to regional metamorphism. The short duration of the heating process in contact metamorphism does not allow for the recrystallization and reorganization of mineral structures that contribute to denser and more resistant rocks. Additionally, the presence of fluids and gases in contact metamorphism can facilitate alteration and weakening of the original rock material.
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.
At divergent boundaries is what metamorphism results from extrusion of basaltic lava?
A metamorphic rock formed from Basalt is Schist. a.k.a. Green Schist
Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by regional metamorphism?
Contact metamorphism does not cause profound compaction, which is the reduction in size of the spaces between mineral particles due to increases in pressure. Regional metamorphism causes compaction and possibly recrystallization, increasing the density of the rock.
Where does contact (prograde) occur?
Contact metamorphism occurs typically around intrusive igneous rocks as a result of the temperature increase caused by the intrusion of magma into cooler country rock. The area surrounding the intrusion where the contact metamorphism effects are present is called the metamorphic aureole. Contact metamorphic rocks are usually known ashornfels. Rocks formed by contact metamorphism may not present signs of strong deformation and are often fine-grained.
What is 2 types of metamorphic rocks?
Metamorphic rocks are formed by the process of extreme heat, pressure and other chemicals. Two types of metamorphism are dynamic which makes the pressure and extreme heat and thermal which is caused by the heat of magma from a volcanic eruption.
Which type of metamorphic rock means formed in fire?
Thermal metamorphism.
Is metasedimentary rock intrusive?
No, its a metamorphic rock formed by metamorphism of sedimentary rock.
How does metamorphism rocks form?
metamorphic rocks are formed from sandstone
What are the two most common non-foliated metamorphic rocks?
The two most common non-foliated metamorphic rocks are marble, formed from the metamorphism of limestone, and quartzite, formed from the metamorphism of quartz sandstone.
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.
What is the difference between slate and phyllite?
Slate is a fine-grained metamorphic rock formed from the low-grade metamorphism of shale or mudstone, while phyllite is a more intermediate-grade metamorphic rock formed from the metamorphism of slate. Phyllite has a more pronounced foliation and sheen due to increased metamorphic pressure and temperature compared to slate.
