[SIT25-P08] The impact of temporal stress variations, dynamic disequilibrium, and asthenospheric channels on the initiation of plate tectonics
Keywords:Plate tectonics, Asthenosphere, Stresses, Non Equilibrium, Mantle Convection
Moreover, we empirically find that the period increases with a decrease in “channel number MN”, which we define as MN=etaA/(dA)3 (here etaA is the non-dimensional channel viscosity and dA the ratio between channel thickness and mantle depth). Therefore, decreasing values of MN move the system toward stagnant lid convection.
At this stage, our results indicate that a decreasing channel number is associated with lower basal shear stress on the plate above, and in that sense, our results are consistent with the idea that basal shear stress, asthenospheric channels, the temporal variation of stresses, and dynamic disequilibrium are critical for initiating plate tectonics.
References. Stamenkovic, V., Höink, T., Lenardic, T. (2016) JGR Planets, 121, 1–20, doi:10.1002/2016JE004994.
Additional Information. This work was supported by a fellowship from the Simons Foundation (award 338555, VS) and by the NSF grant EAR-0944156 (A.L. and T.H.).