Three-dimensional mantle flow beneath mid-ocean ridges

Details Three-dimensional mantle flow beneath mid-ocean ridges Three-dimensional mantle flow beneath mid-ocean ridges

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7851r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B5, p. 7851-7869.

Physics

40

Convective Flow, Earth Mantle, Mid-Ocean Ridges, Sea Floor Spreading, Structural Properties (Geology), Three Dimensional Flow, Mathematical Models, Viscosity

Scientific paper

The development of multiscalar mantle flow beneath mid-ocean ridges is studied using a three-dimensional numerical technique. Various modes of heating are included in the model, as is the shear flow induced by plate motion away from a spreading center with and without transform faults. Segmentation beneath mid-ocean ridges is found to require both strong viscosity contrasts and the lack of deep convective flow. Marine geophysical observations of 2D (sheet-like) mantle upwelling beneath intermediate, fast, and hotspot-influenced spreading centers and 3D (plume-like) upwelling beneath slow-spreading centers and ridges can be explained by variations in the viscosity structure (and temperature) of the mantle along the mid-ocean ridge system. Models which include a transform offset demonstrate that the active portion of the transform is a region of mantle downwelling.

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