Mathematics – Logic
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p22a..06m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P22A-06
Mathematics
Logic
[5419] Planetary Sciences: Solid Surface Planets / Hydrology And Fluvial Processes, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Coordinated orbital observations from Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter have documented a dozen types of deposits characterized by distinctive morphology, stratigraphy, geologic settings, and assemblages of minerals that form in liquid water. Phyllosilicate minerals are widespread in four types of deposits of mostly Noachian age: deep crustal rocks altered to predominantly Fe/Mg-phyllosilicate; shallow, stratified deposits with Al-phyllosilicate overlying Fe/Mg-phyllosilicate; phyllosilicates concentrated in lower beds of deltaic deposits; and phyllosilicate overlain by chlorides in topographically low intercrater plains. Two types of carbonate deposits date to possibly pre-Noachian and later Noachian times respectively: Fe/Ca carbonates exhumed from kilometers depth by impact basins, and shallow Mg-rich carbonates associated with olivine-rich rocks. Hydrated and hydroxylated Mg and/or Fe sulfates occur in three late Noachian to early Hesperian deposit types: shallow layered deposits in Meridiani and thicker ones in Valles Marineris, and intracrater deposits in which the sulfates are commonly associated with Al-phyllosilicate. In addition, gypsum occurs in reworked dune deposits surrounding the north polar layered deposits. Silica-rich deposits occur in shallow sedimentary layers on the Tharsis plateau, and in rare light-colored mounds of probable hydrothermal origin. Although genetic mechanisms of these diverse deposits are still uncertain, they likely represent multiple environments recording different phases of the history of surface and subsurface liquid water on Mars. The mineral assemblages in the sulfate-bearing deposits generally suggest saline, acidic conditions, whereas some of the phyllosilicate- and carbonate-bearing deposits likely record more neutral conditions. Continued and coordinated analysis of these global data sets is revealing new types of deposits and greater detail on their mineral assemblages.
Arvidson Ray E.
Bibring J.
Bishop Janice L.
CRISM Team
Ehlmann Bethany L.
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