ISTerre seminar

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Effects of Fe and volatiles elements on the density of deep silicate melts

Tuesday 4 February 2025 - 11h00

Lucie Canet - ESRF, Grenoble
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C-H-O-N-S are known as volatiles elements which constitute the outgassed atmosphere and have been delivered by comets and chondritic materials. Surface habitability of terrestrial planets and exoplanets is governed by the possibility to store and preserve volatile compounds, such as H2O, CO2 or N2, over geological time. Planets in their early stage experienced a fully molten state, the so-called Magma Ocean, which has strong implications for the subsequent evolution of the planet, from internal processes such as mantle convection and plate tectonics, up to the distribution of chemical elements, and notably the distribution of volatiles between the atmosphere and the interior of the planet.
The aim of this PhD is to study the densities and structure of Fe-rich/volatile-rich silicates glasses (as proxy for the silicate melts) with synchrotron X-ray diffraction and pulsed laser heating at the ESRF (Grenoble, France) at high pressure and high temperature, in order to better understand the existence of a volatiles reservoir at the Core-Mantle Boundary (BMO).

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Organizing team : Géodynamo

Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/91690538748?pwd=buNDS0rAZw9rG4vS1rWxX53zHYdQaw.1