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Only an intrusive igneous rock forms underground, but you can argue that all metamorphism occurs underground. The issue here is that when the metamorphism is thermal, often the ground it is under has only just been formed (i.e. a lava flow). To avoid confusion, only regional metamorphism can take place underground. The rocks formed by regional metamorphism and intrusive magma cooling are rocks with crystalline texture.
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.
contact and regional metamorphic are similar because both of them happen cause of hot heat and pressure which make the rock metamorphic
marble
Hornfels
Only an intrusive igneous rock forms underground, but you can argue that all metamorphism occurs underground. The issue here is that when the metamorphism is thermal, often the ground it is under has only just been formed (i.e. a lava flow). To avoid confusion, only regional metamorphism can take place underground. The rocks formed by regional metamorphism and intrusive magma cooling are rocks with crystalline texture.
Slate is the metamorphic rock, formed from regional (heat and pressure applied) metamorphism on shale.
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.
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.
Regional metamorphism
Zeolite.
regional metamorphism
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.
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.
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.
No, its a metamorphic rock formed by metamorphism of sedimentary rock.
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.