Constraining Composition and Thermal State of Mars From Inversion of Geophysical Data

Details Constraining Composition and Thermal State of Mars From Inversion of Geophysical Data Constraining Composition and Thermal State of Mars From Inversion of Geophysical Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p31c0148c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P31C-0148

Physics

3260 Inverse Theory, 3914 Electrical Properties, 7208 Mantle (1212, 1213, 8124), 7270 Tomography (6982, 8180), 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

We have obtained information on the Martian mantle composition, thermal profile, core size, composition and state, from an inversion of geophysical data pertinent to its interior. The data include the most recent determinations of Martian radius, mean moment of inertia, mean density, second degree tidal Love number and tidal dissipation factor. We have modeled the composition of the silicate portion of Mars using the model system CaO-FeO-MgO-Al2O3-SiO2. Combining self-consistent thermodynamic methods with a stochastic-based inversion algorithm allows us to invert directly for composition and temperature, which transform to parameters crucial to our understanding of Mars, such as mineralogy, bulk mantle and core physical properties. Our results generally suggest an iron-enriched, but more Earth-like mantle composition than has been inferred from the SNC meteorites. Most probable core mantle boundary temperatures are around 2100 °C, implying a liquid core ~1540-1620 km in radius, with a density of ~7.6 g/cm3, most consistent with a metallic composition containing ~12 wt%S.

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