HR: 10:35h
AN: P32A-02 INVITED     [Abstracts]
TI: Mars Through the Eye of HiRISE
AU: * McEwen, A S
EM: mcewen@pirl.lpl.arizona.edu
AF: LPL, University of Arizona, Tucson, AZ 85721, United States
AU: HiRISE, T
EM: mcewen@lpl.arizona.edu
AB: The High Resolution Imaging Science Experiment (HiRISE) has acquired more than 2 Tb of data in more than 1,000 images of Mars at resolutions as high as 25 cm/pixel in the 3 PM mapping orbit of Mars Reconnaissance Orbiter. Each image consists of data from up to 14 CCD detectors and could contain as many as 3 giga-pixels. Early results include (1) improved knowledge of the stratigraphy of the north polar layered deposits and the origin of the thick basal unit; (2) discovery that rocks are uniformly abundant in the Vastitas Borealis Formation covering the northern lowlands; (3) imaging of past landing sites has provided new insights and surprises about the nature of these surfaces; (4) fine layered deposits in Valles Marineris, Meridiani Planum, Arabia Terra and elsewhere are often cut by indurated and/or bleached joints and faults, most likely due to precipitation from fluids; (5) regions of Mars rich in phyllosilicate minerals [Murchie et al., submitted] are seen to consist of layered deposits with fine-scale fractures and polygons; (6) lava flows through Athabasca Valles were surprisingly thick flows that were deflated and drained, leaving behind a veneer of lava with abundant evidence for lava-water interactions; (7) stratigraphic studies reveal two major episodes of fluvial/lacustrine activity in Holden crater, and we've detected exposures of ancient megabreccia in the crater walls; (8) recent large (3-60 km) impact craters have created a range of apparently fluvially-modified landforms; (9) a small cluster of craters from a very recent impact event created a large (~2 km) wide blast zone with thousands of dust avalanches; (10) relatively bright deposits associated with very recent activities in gullies appear to consist of materials eroded from the crater slopes; (11) the south polar residual cap of CO2 has a range of newly-discovered morphologies that constrain models for landscape evolution; and(12) geysers or cold jets associated with sublimation of the seasonal CO2 frost are being monitored.
UR: http:hirise.lpl.arizona.edu/
DE: 5419 Hydrology and fluvial processes
DE: 5462 Polar regions
DE: 5475 Tectonics (8149)
DE: 5480 Volcanism (6063, 8148, 8450)
DE: 6225 Mars
SC: Planetary Sciences [P]
MN: 2007 Joint Assembly