Title

Plate tectonics and mantle controls on plume dynamics

RIS ID

144504

Publication Details

Arnould, M., Coltice, N., Flament, N. & Mallard, C. (2020). Plate tectonics and mantle controls on plume dynamics. Earth and Planetary Science Letters, 547

Abstract

© 2020 Elsevier B.V. Mantle plumes provide valuable information about whole-mantle convection: they originate at the core-mantle boundary, cross Earth's mantle and interact with the lithosphere. For instance, it has been proposed that the mobility/stability of plumes depends on plume intrinsic properties, on how slabs interact with the basal boundary layer, on mantle flow, or on their proximity to mid-ocean ridges. Here, we use 3D-spherical models of mantle convection generating self-consistent plate-like behaviour to investigate the mechanisms linking tectonics and mantle convection to plume dynamics. Our models produce fully-dynamic mantle plumes that rise vertically with deflection 5 cm yr−1 over layer, plate-like regimes decrease the lifetime of plumes compared to stagnant-lid models. Plume age, temperature excess or buoyancy flux are not diagnostic of plume lateral speed. The fraction of plumes moving by less than 0.5 cm yr−1 is >25%, which suggests that fixed hotspot reference frames can be defined from carefully selected hotspot tracks.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.epsl.2020.116439