Dynamically driven mantle flow and shear wave splitting asymmetry across the EPR, MELT area

Details Dynamically driven mantle flow and shear wave splitting asymmetry across the EPR, MELT area Dynamically driven mantle flow and shear wave splitting asymmetry across the EPR, MELT area

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416301c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 16, CiteID L16301

Physics

3

Seismology: Mid-Ocean Ridges, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes

Scientific paper

The southern East Pacific Rise exhibits profound asymmetries in its geophysical character, implying asymmetric melting and flow patterns beneath the plate boundary with inflow from the Pacific superswell region. Shear wave splitting is 0.5-1 seconds larger on the Pacific plate than the Nazca plate. As seismic anisotropy is a measure of mantle strain history, the shear wave splitting signature provides an important constraint on mantle flow patterns. Finite-element models of mantle flow using rheology that accounts for both dislocation and diffusion creep, coupled with calculations of mineral texturing and subsequent shear wave splitting predictions, show that either a model of dynamically driven flow or a passive thermal anomaly model can provide a reasonable fit to the observed asymmetric shear wave splitting. Dynamic flow produces a thicker anisotropic layer beneath the Pacific plate, while extending the melting region westward, simultaneously explaining shear wave splitting observations and the inferred asymmetric melt production.

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