Fast plumeheads: Temperature-dependent versus non-Newtonian rheology

Details Fast plumeheads: Temperature-dependent versus non-Newtonian rheology Fast plumeheads: Temperature-dependent versus non-Newtonian rheology

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1995l&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 16, p. 1995-1998

Physics

15

Tectonophysics: Heat Generation And Transport, Tectonophysics: Physics Of Magma And Magma Bodies, Tectonophysics: Continental Margins And Sedimentary Basins, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

In a series of two-dimensional Cartesian simulations with high resolution, on the order of 2 km, we have compared for the same effective Rayleigh number, around 106, the dynamics between Newtonian and non-Newtonian rheologies. A viscosity contrast due to temperature of 1200 has been employed throughout with surface dissipation numbers varying between 0.05 and 0.2. Peak velocities for non-Newtonian plumes are at least 50 times faster than the peak Newtonian velocities and reach magnitudes in excess of m/yr. Upon impinging the surface, plume head structures of the non-Newtonian rheology contain much greater complexity in the thermal-mechanical structure than for Newtonian plumes.

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