What is regional metamorphis?

Regional metamorphism is a geological process that occurs when large areas of the Earth's crust are subjected to high temperatures and pressures over extended periods, typically due to tectonic forces such as continental collision. This process results in the transformation of existing rocks, primarily sedimentary and igneous, into metamorphic rocks. The mineral composition and texture of the rocks change, often producing foliated structures, such as schist or gneiss. Regional metamorphism is commonly associated with mountain-building events and the formation of metamorphic belts.