From the Earth to Super-Earth: Experimental study of molten geomaterials in planetary interiors


Guillaume Morard

From Institut des Sciences de la Terre, Grenoble University, France


Hosted by Jean-Alexis Hernandez

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Understanding planetary interiors is one of the main focus in geophysics, as conditions at the surface of a planet are intimately linked with the process occurring at a geological timescale in the inside of a planet. Obtaining physical properties and phase diagrams under extreme pressure and temperature for silicates and iron alloys can therefore help to model the generation of the magnetic field, the processes of differentiation and the production of a secondary atmosphere, for example. In particular, the thermal state of a planet is driven by the melting temperature of its components. Melting curve of iron and iron alloys constrain the driving force to power the geodynamo, whereas melting relations of silicates is describes how a planet change from a molten ball in magma ocean state to a shell structure.

In the present talk, I will present how to measure melting relations and liquid physical properties under high pressure and the consequences of these results on planetary interiors, from Earth’s core chemical composition to magnetic field generation in exoplanets.

Published Feb. 4, 2020 8:23 AM - Last modified Feb. 4, 2020 8:23 AM