Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p43b1398l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P43B-1398
Other
5400 Planetary Sciences: Solid Surface Planets, 5410 Composition (1060, 3672), 5460 Physical Properties Of Materials, 5464 Remote Sensing, 6225 Mars
Scientific paper
Ferric sulfate minerals were identified in several light-toned subsurface soils in Gusev Crater, Mars, that were exposed by the Mars Exploration Rover (Spirit) wheels. Although the identified ferric sulfate minerals vary from site to site, several different ferric sulfates have been identified, including ferricopiapite (dominating the Paso Robles bright track soils), (para)coquimbite, fibroferrite, rhomboclase, and hydronium jarosite, and possibly minor (para)butlerite or metahohmanite. Recent work by the Mars Reconnaissance Orbiter (MRO) CRISM team suggests that polyhydrated sulfates such as ferricopiapite may be widely present on Mars, and that ferricopiapite may be found in a partially dehydrated state in inverted channels in Juventae Chasma and other nearby Chasma in the Valles Marineris region. A growing laboratory suite of ferric sulfate minerals (including the minerals mentioned above as well as many other ferric sulfates, some of which were intentionally dehydrated) have been analyzed using a thermal emission (midinfrared) spectroscopic technique to continue to provide well-defined and well-understood emissivity spectra of a large range of ferric sulfate minerals in order to aid and expedite the identification of these minerals using TES and Mini-TES thermal emission data from Mars. This work also includes thermal emission studies of a variety of sulfide minerals for a similar purpose of identifying them on Mars. Sulfides occur in terrestrial volcanic terrains similar to igneous terrains on Mars, and sulfides also are found in Martian meteorites. The sulfides are an important mineral class to understand because they are possible precursor minerals that can follow an oxidation pathway (with proper hydration and pH) to form ferric sulfate minerals.
Bishop Janice L.
Darby Dyar M.
Hyde Brendt C.
King Penelope L.
Lane Melissa D.
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