Séminaire IPAG

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Differentiation of terrestrial planets, and implications for their long-term evolution and dynamics

jeudi 7 mars 2024 - 11h00

Renaud Deguen - ISTerre
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The Earth was formed 4.56 Gy ago by the accretion of material from the solar nebula over a few tens of millions of years. The basic ingredients of a terrestrial planet - an iron-rich metal and silicates (rocks) - are immiscible, and can separate under the action of gravity to form an iron-rich core surrounded by a rocky mantle, a process that is thought to be concomitant with Earth's accretion. Although it occurred in a very short period of time compared with geological time scales, core-mantle differentiation has long-lasting implications for the structure and dynamics of the planet. The first part of this talk will be devoted to a discussion of heat partitioning between core and mantle as a result of differentiation, and its implications for the thermal and magnetic evolution of terrestrial planets. In a second part, we will show how fluid dynamic experiments can be used to model metal-silicate heat and mass transfer in magma oceans, and to help interpret geochemical data in terms of the timing and conditions of core-mantle differentiation.

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Salle Manuel Forestini, 414 rue de la piscine, 38400 Saint Martin d'Hères