Mathematics – Logic
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999msls.work...14c&link_type=abstract
Second Mars Surveyor Landing Site Workshop, p. 14
Mathematics
Logic
Mars Surveyor 2001 Mission, Mars Surface, Landing Sites, Site Selection, Mars Craters, Wind Erosion, Thermal Emission, Spectrometers
Scientific paper
The area detected by TES to have a concentration of hematite, within north Terra Meridiani, is formally proposed as a candidate landing site for the Mars Surveyor 2001 Mission. It is also the only place on Mars where TES has noted a very different surface; therefore, although this area may not contain a diversity of rock types--it is likely to be a unique-appearing site, both visually and chemically dissimilar to Viking and Pathfinder Sites. The candidate site is on the ancient Martian highlands (within required latitude band of 3 N. to 12 S.), shows evidence of nearby ancient channels, and may have experienced some type of hydrothermal alteration during the Hesperian or Amazonian Systems. The whole of north Terra Meridiani (centered at lat. 0, long. 0) contains an unusual and enigmatic terrain unit. On the equatorial geologic maps of Mars, this highland area was mapped as being surfaced by two units of Noachian age: a subdued crater unit and an etched unit. The subdued crater unit is a plains unit marked by subdued and buried old crater rims and was interpreted to be thin, interbedded lava flows and eolian deposits that partly bury underlying rocks. The etched unit was described as being deeply furrowed by grooves that produce an etched or sculptured surface and was interpreted to be ancient cratered material degraded by wind erosion, decay of ground ice, and minor fluvial erosion. However, closer inspection of the 360,000 sq km area has revealed new details: specifically, the area is surfaced by a younger deposit, which (1) overlies Noachian materials and (2) consists of both intermediate and bright albedo materials, having very different rock attributes.
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