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.
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.
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.
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.
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.
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.
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.
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.
A metamorphic rock formed from Basalt is Schist. a.k.a. Green Schist
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.
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.
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.
Thermal metamorphism.
No, its a metamorphic rock formed by metamorphism of sedimentary rock.
metamorphic rocks are formed from sandstone
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.
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.
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.