The dynamics of plume-ridge interaction-III. The effects of ridge migration

Details The dynamics of plume-ridge interaction-III. The effects of ridge migration The dynamics of plume-ridge interaction-III. The effects of ridge migration

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.133..511r&link_type=abstract

Geophysical Journal International, Volume 133, Issue 3, pp. 511-518.

Physics

7

Scientific paper

To investigate how the migration of ridges influences their interaction with nearby mantle plumes, we study a thin-layer model in which a point source (analogous to a plume stem) releases buoyant fluid at a rate Q into a viscous corner flow driven by a ridge-like surface-boundary condition. The ridge has a half-spreading rate U, and migrates relative to the point source at a constant speed Um and azimuth θ from the plate-spreading direction. Numerical solutions of the governing differential equation yield predictions of the lateral extent W of plume fluid along the ridge (`waist width') which we compare with observed waist widths for 11 on- and near-ridge hotspots. The main dynamical effect of ridge migration is to increase the maximum interaction distance for a ridge receding from a plume, and to decrease this distance for a ridge approaching a plume. Models including normal (√ age) thickening and plume-induced thinning of the lithosphere show that both effects have only a small (maximum ~ 20 per cent) influence on the dynamics. Our results suggest that the volume fluxes Q of five plumes far from ridges (Sala y Gomez, St. Helena, Great Meteor, Reunion and Kerguelen) may be two to three times higher than previously estimated.

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