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Thermal convection in an heterogeneous mantle: plumes, piles, domes, and LLSVPs.

Presented by: 
Anne Davaille CNRS (Centre national de la recherche scientifique), Université Paris-Sud 11
Date: 
Thursday 18th February 2016 - 09:00 to 10:00
Venue: 
INI Seminar Room 1
Abstract: 
Planetary long-term cooling, as well as surface phenomena such as plate tectonics, volcanoes and earthquakes, are mainly controlled by the existence and patterns of convective motions in the solid-state mantle. The morphology and characteristics of convective patterns strongly depends on the mantle physical properties and the existence of density heterogeneities.

I shall review how the interplay of the latter with thermal convection produces mantle instabilities of widely varying morphology and time-dependence, according to the magnitude of the density anomalies and the type of mantle rheology. They could therefore explain the diversity of hot spot volcanism observed on Earth, as well as the mantle structures revealed by seismic tomography. 
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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons