Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p41a0191r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P41A-0191
Mathematics
Logic
0545 Modeling (4255), 5430 Interiors (8147)
Scientific paper
The higher iron content of the Martian mantle as compared to Earth's mantle results in a mineralogy and phase transition pattern which is somewhat different to that of the Earth; for instance, ringwoodite appears already at lower pressures than wadsleyite. Moreover, the two-phase loops in the Mg2SiO4--Fe2SiO4 system are broader and their position and width seem to be more sensitive to changes in temperature. Another concern is the uncertainty about the depth of the core--mantle boundary in Mars, which happens to lie at about the depth of the ringwoodite-(perovskite+magnesiowüstite) transition. Previous studies have already demonstrated the possibility that Mars had a perovskite layer at the base of its mantle which may have disappeared during the history of the planet as a consequence of secular cooling. In our study, we attempt to model the evolution of the phase transition patterns, i.e. the changes in position and width of transitions and the mineralogical changes, as a consequence of secular cooling and discuss their effect on the long-term convection style of the martian mantle.
Ruedas Thomas
Tackley Paul J.
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