A suture is a major fault zone that represents the boundary between two collided tectonic plates, often marked by distinct geological features such as ophiolites, metamorphic rocks, and volcanic arcs. Sutures are significant for understanding the processes of continental collision, orogenesis, and the assembly of supercontinents.
Source Matte, P. (1986). “Tectonics and Plate Tectonics Model for the Variscan Belt of Europe.” Tectonophysics, 126(3-4), 329-374.