Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p44a..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P44A-06
Mathematics
Logic
6225 Mars
Scientific paper
The analysis of the ~2 m vertical exposure of the rim of Home Plate allows a preliminary assessment of its sedimentologic characteristics. Pancam and MI images of the Barnhill and Rogan outcrops and that of several floats suggest that Home Plate could be divided intoat least two main units. Differences in morphology and sedimentology are noticeable at Pancam resolution. When scrutinized at MI resolution, the various facies are complex, with transitions from one unit to the next. Barnhill is made of ash-size material and granules (possibly lapillis). The morphology of the ash-like deposit bears a striking morphological resemblance with Pot- of-Gold documented in West Spur (sol 156 and 180). The Rogan unit consists mostly of granular, layered, rocks (medium sandstone-size material) with common cross-beds. While layered and granular rocks are numerous at Home Plate, they present differences suggesting variations in local conditions and/or processes. For instance, the rock Posey (a float) documented at the foot of Home Plate shows layers and crossbeds. However, its sedimentologic characteristics are distinct compared to that of the average Rogan outcrop. The matrix of the rock itself is clearly below MI resolution, which reminds of the Barnhill outcrop material but conversely to Barnhill, there are no lapilli-size grains embedded in Posey. Many 300-500 μm average size rounded grains are observed in the rock instead, 900 μm for the largest visible. Posey layers are made of sand- size material and the structure of the rock suggests sequencing in the layering with thick (700-900 μm) and thin layers (130-300 μm). The difference in size of the layering is accompanied by a difference in tone. Thicker layers have been exposed by erosion (protruding) and are subdivided. In summary, the diversity of materials exposed in Home Plate and their structure suggest a diversity of processes that could have been acting locally or regionally repeatedly during the early history of Gusev, or could reflect different phases of a single event (e.g., volcanic, impact, ).
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