Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p51d0971m&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P51D-0971
Physics
1000 Geochemistry, 1009 Geochemical Modeling (3610, 8410), 5470 Surface Materials And Properties, 6200 Planetary Sciences: Solar System Objects, 6225 Mars
Scientific paper
The Mars Exploration Rover (MER) missions have stimulated considerable thinking about the surficial geochemical evolution of Mars. Among the major MER findings is the presence of the mineral, jarosite (a ferric sulfate salt), which suggests formation from an acid-sulfate brine. The main objectives of this work were to add ferric iron chemistry to an existing ferrous iron/acid sulfate chemical thermodynamic model (FREZCHEM), and to use this model to simulate the geochemical evolution of the Martian surface. In this work, we parameterized the FREZCHEM model for ferric iron chemistry using the Pitzer approach. New iron minerals added to the model include jarosite (K, H, and Na varieties), ferricopiapite, coquimbite, and schwertmannite. These particular iron minerals were chosen because they frequently form from acidic brines on Earth. The Martian simulations will examine how brine chemistries, iron chemistries, acidity, and the redox environment control the surficial geochemistry of Mars.
Catling David C.
Kargel Jeff S.
Marion Giles M.
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