Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p21c..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P21C-04
Mathematics
Logic
3672 Planetary Mineralogy And Petrology (5410), 5410 Composition, 5464 Remote Sensing
Scientific paper
Near-global (60 S to 60 N) thermal infrared mapping by the MGS Thermal Emission Spectrometer (TES) has revealed unique deposits of crystalline gray hematite (a-Fe2O3) exposed at the martian surface in Sinus Meridiani, Aram Chaos, and in numerous scattered locations throughout Valles Marineris. The Sinus Meridiani material is an in-place, rock-stratigraphic sedimentary unit charac-terized by smooth, friable layers of basaltic sediments with approximately 10-15% crystalline gray hematite. This unit has outliers to the north that appear to have been isolated by stripping and removal. The hematite within Aram Chaos occurs in a sedimentary layer within a closed basin that was likely formed during the basin infilling and pre-dates the formation of nearby chaos and outflow terrains. The Valles Marineris occurrences are closely associated with the interior layered deposits, and may be in place within the layers or eroded sediments. In general crystalline gray hematite is extremely uncommon at the surface, yet in all observed locations it is closely associated with layered, sedi-mentary units. These hematite deposits likely formed by some process involving chemical pre-cipitation from aqueous fluids, under either ambient or hydrothermal conditions. The TES miner-alogic data provide evidence that liquid water was stable at or near the surface in specific locations on Mars. The Sinus Meridiani region provides an opportunity to test aqueous mineralization hy-potheses, and presents an excellent candidate for landed missions searching for biotic and pre-biotic environments of high astrobiology interest.
Bandfield Joshua
Christensen Per Rex
Lane Melissa D.
Morris Richard V.
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