Metamorphic core complexes are large-scale geologic structures formed through extensional tectonic processes within the Earth's crust. They are typically associated with mountain-building events and involve the uplift and exhumation of deep-seated rocks to the Earth's surface. These complexes are characterized by the presence of low-angle detachment faults, which separate the overlying crustal rocks from the deeper, partially molten or ductile rocks below. As the detachment fault slips, it allows for the overlying rocks to be uplifted and exposed at the surface, leading to the formation of dome-like structures and extensive metamorphic processes. Metamorphic core complexes are commonly found in regions of continental extension, such as rift zones or areas undergoing crustal thinning. They provide important insights into the dynamics of crustal deformation and the processes that drive mountain building and the evolution of the Earth's crust.