Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1011n&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 011.
Mathematics
Logic
Sediments, Landing Sites, Deposition, Geological Surveys, Mapping, Planetary Mantles
Scientific paper
New geologic mapping of the Chryse Planitia watershed on Mars enables refinement of the geologic history of this region. The area mapped at 1:2M scale covers 35 N to 15 S and 10 to 67 W. Fluvial outflow processes of the Ares/Tiu/Simud channels were initiated with sheet floods over the tectonically modified Noachian cratered terrain. Subsequent erosion and transportation of sediments from multiple floods throughout the Hesperian period led to extensive deposits at the Mars Pathfinder Landing Site. Four areas of potential sediment contributions are identified: those composed of predominantly Noachian, Hesperian/Noachian, and Hesperian age materials, plus a few small areas contributing reworked outflow materials of unknown ages. A mantle of sand and dust deposited during the Amazonian also contributes a large component of the soil to be measured by Sojourner. Detailed mapping using 1:2M photomosaics and Viking Orbiter images allowed further subdivisions of some of the units into facies related to erosion and deposition of the outflow channel materials. Correlation between the outflow channel watersheds and the related geologic units indicate four principal sources of sediment contributions: (1) Noachian materials; (2) Hesperian/Noachian; and (3) Hesperian materials.
Greeley Ronald
Kuzmin Ruslan O.
Nelson David M.
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