True polar wander and plate-driving forces

Details True polar wander and plate-driving forces True polar wander and plate-driving forces

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1837d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 10, 1985, p. 1837-1841.

Physics

11

Lithosphere, Plates (Tectonics), Polar Wandering (Geology), Ocean Bottom, Rotating Environments, Shear Stress, Torque

Scientific paper

The nature of net torques applied to the lithosphere by ridge and trench forces as implied by the absence of recent true polar wander is explored. The 'ridge push' and 'trench pull' forces and the potential net torques on the global lithosphere contributed by each of these forces are discussed. It is shown that the relative magnitudes of the net torques contributed by ridge and trench forces are constrained by the absence of true polar wander during the Cenozoic and by the magnitudes of basal shear stresses on the faster moving plates. It is suggested that the lack of recent true polar wander may be due at least in part to the coincidence of a near cancellation of net torques contributed by ridge and trench forces.

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