the process must take place underground~ apex
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The changes to the rock must occur in solid form Tons of pressure must be applied for metamorphism to happen.
The changes to the rock must occur in solid form. The process must take place underground. The parent rock must be in solid form.
For metamorphism to occur, high temperatures, high pressures, and/or the presence of chemically active fluids must be present. These conditions cause changes in the mineral composition, texture, and structure of rocks without melting them into magma. The process can lead to the formation of new minerals and rock types.
There are primarily two types of metamorphism that occur in Earth's crust: regional metamorphism and contact metamorphism. Regional metamorphism results from the tectonic forces that cause rock to be subjected to high pressure and temperature over a large area, while contact metamorphism occurs when rocks are altered by the heat and chemicals from intruding magma near the Earth's surface.
Metamorphism can occur through contact metamorphism, where rocks are altered by heat from nearby magma; regional metamorphism, where rocks are subjected to high pressure and temperature over a large area; burial metamorphism, where rocks are subjected to increased pressure from being buried deep underground; and dynamic metamorphism, where rocks are deformed under high pressure but low temperature conditions along faults or shear zones.
contact
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Contact metamorphism occurs next to an intrusion of molten magma. This type of metamorphism happens when hot magma comes into contact with existing rock, causing the rock to undergo changes in mineralogy and texture due to the heat and pressure.