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

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• Anne Davaille (CNRS (Centre national de la recherche scientifique); Université Paris Saclay)
• Thursday 18 February 2016, 09:00-10:00
• Seminar Room 1, Newton Institute.

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MIMW01 - From foundations to state-of-the-art in magma/mantle dynamics

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. 

This talk is part of the Isaac Newton Institute Seminar Series series.

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