Thermally-Driven Mantle Plumes Reconcile Hot-spot Observations

Details Thermally-Driven Mantle Plumes Reconcile Hot-spot Observations Thermally-Driven Mantle Plumes Reconcile Hot-spot Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmdi53a1698d&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #DI53A-1698

Other

0545 Modeling (4255), 3037 Oceanic Hotspots And Intraplate Volcanism, 8415 Intra-Plate Processes (1033, 3615), 8450 Planetary Volcanism (5480, 6063, 8148)

Scientific paper

Hot-spots are anomalous regions of magmatism that cannot be directly associated with plate tectonic processes (e.g. Morgan, 1972). They are widely regarded as the surface expression of upwelling mantle plumes. Hot-spots exhibit variable life-spans, magmatic productivity and fixity (e.g. Ito and van Keken, 2007). This suggests that a wide-range of upwelling structures coexist within Earth's mantle, a view supported by geochemical and seismic evidence, but, thus far, not reproduced by numerical models. Here, results from a new, global, 3-D spherical, mantle convection model are presented, which better reconcile hot-spot observations, the key modification from previous models being increased convective vigor. Model upwellings show broad-ranging dynamics; some drift slowly, while others are more mobile, displaying variable life-spans, intensities and migration velocities. Such behavior is consistent with hot-spot observations, indicating that the mantle must be simulated at the correct vigor and in the appropriate geometry to reproduce Earth-like dynamics. Thermally-driven mantle plumes can explain the principal features of hot-spot volcanism on Earth.

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