Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgre..10905003t&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue E5, CiteID E05003
Physics
54
Geochemistry: Low-Temperature Geochemistry, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Planetary Mineralogy And Petrology (5410), Planetology: Solid Surface Planets: Erosion And Weathering, Planetology: Solid Surface Planets: Surface Materials And Properties
Scientific paper
The acid fog model has received considerable attention as a model of soil formation on Mars. Previous evaluations of this model have focused on experimental weathering of terrestrial basalt samples. However, these samples differ significantly from what now is thought to be typical of Martian basalt. The acid fog model is tested here using synthetic basaltic analogs derived from Mars Pathfinder soil and rock compositions. Reaction of synthetic basalt with various acidic solutions and subsequent evaporation has led to the formation of several putative secondary mineral phases. Many of these phases were not produced in prior experimental studies aimed at aqueous interactions on Mars. Of these alteration phases, Mg, Fe, Ca, and Al sulfates were identified. In addition, secondary ferric oxide phases formed via rapid Fe oxidation under relatively high pH levels buffered by basalt dissolution. Amorphous silica is a ubiquitous product in these experiments and has formed by precipitation from solution and by the dissolution of minerals and glasses leaving behind leached surface layers composed of residual silica. The secondary products formed in these experiments demonstrate the importance of primary mineralogy when testing models of aqueous interactions on Mars. New constraints are placed on both the reactivity of primary basalt and the secondary mineralogy present at the Martian surface.
Lindsley Donald H.
McLennan Scott M.
Schoonen Martin A. A.
Tosca Nicholas J.
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