Dynamical modeling of Mars deep interior Sylvaine Ferrachat Institut für Planetologie Westfälische Wilhelms-Universität Münster.

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Dynamical modeling of Mars deep interior Sylvaine Ferrachat Institut für Planetologie Westfälische Wilhelms-Universität Münster

Main projects / Interests Earth mantle dynamics –Convection pattern –Relationships convection/plate tectonics –Mixing properties of 2D, 3D conv. Syst. –Secular chemical evolution –Relationships convection basalt / geochemistry Mars mantle dynamics –Early history and chemical distribution –Magnetic field –Gravity field –Magmatism

Main projects / Interests Earth mantle dynamics –Convection pattern –Relationships convection/plate tectonics –Mixing properties of 2D, 3D conv. Syst. –Secular chemical evolution –Relationships convection basalt / geochemistry Mars mantle dynamics –Early history and chemical distribution –Magnetic field –Gravity field –Magmatism Curriculum –2000, PhD thesis, ENS Lyon, adv. Y. Ricard – , Post-doc, UC Davis – , teaching assistant, IUFM Lyon – consultancy for UC Davis –2004, post-doc, IfP Münster

Main projects / Interests Earth mantle dynamics –Convection pattern –Relationships convection/plate tectonics –Mixing properties of 2D, 3D conv. Syst. –Secular chemical evolution –Relationships convection basalt / geochemistry Mars mantle dynamics –Early history and chemical distribution –Magnetic field –Gravity field –Magmatism Curriculum –2000, PhD thesis, ENS Lyon, adv. Y. Ricard – , Post-doc, UC Davis – , teaching assistant, IUFM Lyon – consultancy for UC Davis –2004, post-doc, IfP Münster

Main projects / Interests Earth mantle dynamics –Convection pattern –Relationships convection/plate tectonics –Mixing properties of 2D, 3D conv. Syst. –Secular chemical evolution –Relationships convection basalt / geochemistry Mars mantle dynamics –Early history and chemical distribution –Magnetic field –Gravity field –Magmatism Curriculum –2000, PhD thesis, ENS Lyon, adv. Y. Ricard – , Post-doc, UC Davis – , teaching assistant, IUFM Lyon – consultancy for UC Davis –2004, post-doc, IfP Münster

Earth mantle efficient convection Vs Distinct geochemical signatures in basalt PhD thesis Mixing in the mantle & geochemical heterogeneities

Features: Partial melting based on adiabatic equilibrium Latent heat consumption and feedback on local temperature Intentions: Evolution of the distribution of chemical species and isotope ratios (U, Pb, He,…) in the whole system F in each cell of the partial melting zone Concentration of any incompatible species Low High Heterogeneous residu Homogeneous Basaltic liquid Fractionation law Scientific project in UC Davis Thermochemical convection & dynamical partial melting

Current MAGE project: Mars early history & mantle dynamics Would chemical stratif. due to fractional crystallization of a deep magma ocean be able to start a dynamo and reproduce the Martian magnetic history? This work investigates this idea with convective models… …sudden cooling of the CMB? After L. Elkins-Tanton et al, 2003

Current MAGE project

Current MAGE project Future directions An improved model will take into account: –Phase transitions –Viscosity variations –Partial melting This model will be tested against its effects on: –Magnetic field history –Volcanism –Gravity signal

Current MAGE project Future directions An improved model will take into account: –Phase transitions –Viscosity variations –Partial melting This model will be tested against its effects on: –Magnetic field history –Volcanism –Gravity signal Collab. with other teams within the MAGE Network

Current Experience in the Network A few general points: –Late arrival in the Network (as most postdocs here!) Only a brief experience… –Really nice welcome in the group –Good scientific exchanges and discussions within the group A big advantage of being part of the MAGE network: Switch from solid Earth dynamics community to planetology community Opportunity to: –Enlarge my field –Enter the planetology community