D. D. Van Reenen, J. M. Barton, Jr., C. Roering, C. A. Smith, J. F. Van Schalkwyk; Deep crystal response to continental collision: The Limpopo belt of southern Africa. Geology ; 15 (1): 11–14. doi: https://doi.org/10.1130/0091-7613(1987)15<11:DCRTCC>2.0.CO;2
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The Limpopo belt is an example of an Archean, 2700 Ma, continental collisional zone in which the thickened crust (±70 km) has virtually attained equilibrium with the adjacent non-thickened plates by a process of upward movement and lateral spreading of the underthrust, high-grade metamorphosed plates.