Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p34a..03c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P34A-03
Mathematics
Logic
6225 Mars, 8425 Effusive Volcanism, 8429 Lava Rheology And Morphology, 8450 Planetary Volcanism (5480, 6063, 8148), 8486 Field Relationships (1090, 3690)
Scientific paper
Lava flows account for a significant fraction of the surface of Mars and HiRISE has imaged a diverse selection of these areas at resolutions comparable to "air photos" on Earth. Although some lava are extensively impact "gardened" or mantled, many areas retain primary geomorphologic information at meter-scale. Primary characteristics similar to that of late Cenozoic lava flows in arid areas of Earth are visible in the HiRISE images of even some Hesperian lava plains. The extensive mantling by wind-blown deposits in some of the more youthful volcanic terrains (e.g., Tharsis) may, like terrestrial counterparts, be a result of the excessively rough surface trapping mobilized sand. Evidence for lava flow inflation, including lava-rise plateaus and pits and deformation both vertically and laterally of lava crusts, is documented in areas of flood lavas. Other lava flows are clearly fed from surface channels resulting in dispersive flow surface pattern. Lava flows with hummocky surface textures are comparable to terrestrial flows with auto-brecciated and disturbed surfaces, but the Martian flows are often much larger than typical terrestrial examples. Kilometer-scale areas of puzzle-work plates characterize some flood lava flows. The abundance of plate-like and rubbly deformation styles observed at many localities on Mars is consistent with examples of rubbly pahoehoe seen in situ by the Spirit rover. Rubbly pahoehoe may be a common primary surface texture for many areas of plains-like lava flow emplacement such as the Hesperian lava plains. Sinuous rill-like channels headed at distinct vents and collapse pits suggest significant lava erosion and correspondingly high effusion rates. While the Athabasca Valles channel bed forms appear to be associated with major aqueous outflows, the entire region is draped with lava.
Crumpler Larry S.
HiRISE Team
Jaeger Windy L.
Keszthelyi Laszlo P.
McEwen Alfred S.
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