Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p52b0585m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P52B-0585
Physics
1045 Low-Temperature Geochemistry, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 3672 Planetary Mineralogy And Petrology (5410), 6225 Mars
Scientific paper
Iron has played an important role in the surficial evolution of Mars. Surficial iron chemistry on Mars probably passed through three or four phases: dissolution of primary ferrous minerals, possible precipitation of secondary ferrous minerals, oxidation of ferrous to ferric iron, and ultimately, hydrolysis of ferric iron to insoluble oxide minerals such as hematite. The evolution of iron chemistry on Mars is closely tied to primary mineralogy, low-temperature aqueous geochemistry, which includes complex redox reactions, and interactions with atmospheric carbon dioxide, hydrogen, and oxygen. In this work, we incorporated iron solubility products and Pitzer-equation binary and ternary interaction parameters for iron with hydrogen, sodium, potassium, magnesium, calcium, chloride, sulfate, and bicarbonate/carbonate into the FREZCHEM model. Then we used the model to estimate constraints on surficial Martian iron chemistry. Model fits to FeCl2, FeSO4, and FeCO3 solubility data are excellent. Under reducing c
Catling David C.
Kargel Jeff S.
Marion Giles M.
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