Where does most metamorphism take place?
Most metamorphism takes place deep underground, where high heat and pressure change the rocks, since both increase with depth.
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.
Contact metamorphism takes place locally near igneous intrusions. It is caused by low to moderate pressure, intense heat, and reactions to magma that is being metamorphosed. When contact metamorphism takes place with mudstone or shale (sedimentary rocks) slate is formed. The mudstone or shale is the parent rock or protolith.
Precipitation from a fluid like H2O or CO2. This can take place within the Earth by hydrothermal processes, diagenesis, and metamorphism, and at or near the Earth's surface as a result of evaporation, weathering, or biological activity. Sublimation from a vapor. This process is somewhat more rare, but can take place at a volcanic vent, or deep in space where the pressure is near vacuum. Crystallization from a liquid. This takes place during crystallization of…
When rock is in contact with or near a mass of magma a type of metamorphism called what takes place?
Rock changes into a metamorphic rock when the protolith (parent rock) goes through the process of metamorphism. During metamorphism the rock is subjected to high temperature and pressure which causes chemical and physical changes in the rock. The metamorphic process can take place under the earths surface or it can be caused by tectonic processes and also the intrusion of magma into the earths crust.
There is only one similarity: regional metamorphism and the formation of sedimentary rock both require high pressure. The differences are: All metamorphism requires heat, whereas if heat is too excessive, a sedimentary rock is not formed, but an igneous or metamorphic one. Sedimentary rocks are made of fragments, whereas metamorphic rocks are from existing rocks Metamorphism requires the partial recrystallisation of the old rock, but in a sedimentary rock there are no crystals, so no…