A possible relation between pulses of platform activation and plate kinematics

Abstract

The idea of the cyclic evolution of platforms may have an explanation related to plate kinematics as a function of two main parameters: the spreading rate and rotation pole switches. These kinematic parameters as defined by other authors studying the South Atlantic appear to bear a coherent relationship with pulses of platform activation in South America and Africa. In Gondwana's history, after its break-up at least four major peaks of volcano-tectonic activity on the continents seem to be related to important changes in position of the rotation poles and the spreading rates of the South American and African plates. Mantle convection patterns such as those suggested by McKenzie on the Pacific floor can be seen as feasible mechanisms for explaining the origin and shape of large syneclises and archings.