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

1 hour 3 mins, 919.49 MB, MPEG-4 Video 640x360, 29.97 fps, 44100 Hz, 1.94 Mbits/sec

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Description:	Davaille, A [CNRS (Centre national de la recherche scientifique), Université Paris-Sud 11] Thursday 18th February 2016 - 09:00 to 10:00


Created:	2016-02-22 15:47
Collection:	Melt in the Mantle
Publisher:	Isaac Newton Institute
Copyright:	Davaille, A
Language:	eng (English)


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.

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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