Definition - What does Regional Metamorphism mean?
Regional Metamorphism is a kind of metamorphism that depicts the texture of rocks due to deep burial and heating. It is associated with the large-scale forces of plate tectonics. Generally, it occurs in large areas that do not have any relationship with igneous bodies. The process is carried under non-hydrostatic and differential stress conditions. Moreover, it results into the formation of metamorphic rocks that are foliated and includes schists, gneisses, and slates. However, these rocks only occur at cores of fold mountain belts and in eroded mountain ranges.
Petropedia explains Regional Metamorphism
Regional Metamorphism occurs in the broad areas of crust. It occurs due to the periodic changes in pressure and temperature. Due to this, rocks are formed that experiences deviatoric stress producing foliations. Moreover, metamorphic facies are established to describe the end products of the metamorphism. For instance, the low-grade metamorphic rates, prehnite-pumpellyite facies and the high-grade metamorphic rocks include granulite facies. One of the most famous examples of Regional Metamorphism is the Dalradian series of Scotland. It is approximately 80 kilometers wide and lies in the north of the Highland Boundary fault.