dynamical modeling of mars deep interior sylvaine ferrachat institut für planetologie westfälische...
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Dynamical modeling of Mars deep interior
Sylvaine Ferrachat
Institut für PlanetologieWestfälische 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
– 2000 - 2002, Post-doc, UC Davis
– 2002 - 2003, teaching assistant, IUFM Lyon
– 2003 - 2004 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
– 2000 - 2002, Post-doc, UC Davis
– 2002 - 2003, teaching assistant, IUFM Lyon
– 2003 - 2004 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
– 2000 - 2002, Post-doc, UC Davis
– 2002 - 2003, teaching assistant, IUFM Lyon
– 2003 - 2004 consultancy for UC Davis
– 2004, post-doc, IfP Münster
Earth mantle efficient convection
Vs
Distinct geochemical signatures in basalt
PhD thesisMixing 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 DavisThermochemical 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
Current MAGE projectFuture 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 projectFuture 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