tampon translations: tampon. Learn more in the Cambridge English-French Dictionary.
Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.etamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.
1 Metamorphism is the transformation of one rock type into another. 2  Metamorphic rocks form from pre-existing rocks (either igneous, sedimentary, or other metamorphic rocks) that have been altered by the agents of metamorphism, which include heat, pressure (stress) , and chemically active fluids. Metamorphic rocks form from pre-existing rocks (either igneous, sedimentary, or other metamorphic rocks) that have been altered by the agents of metamorphism, which include heat, pressure (stress) , and chemically active fluids. 2  During metamorphism the material essentially remains solid.