Preservation of Evidence of Ancient Environments in addition to Life on Mars

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Preservation of Evidence of Ancient Environments in addition to Life on Mars

Shaw, Mike, News Director has reference to this Academic Journal, PHwiki organized this Journal David J. Des Marais NASA Ames Research Center Early Mars Preservation of Evidence of Ancient Environments in addition to Life on Mars Mars today Preservation: topics Noachian-Hesperian environments & processes Persistence of ancient aqueous environments Nature of deposits in Noachian aqueous environments Phyllosilicate deposits & organic matter concentrations Preservation potential of the four “finalist” MSL sites

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Importance of Age Meridiani Planum in addition to the Global Hydrology of Mars Andrews-Hanna et al. (2007) A B A B detected evaporite deposits Importance of Elevation Stream Systems Stepinski & Luo, LPSC41, 2010

Gusev Crater ~180 km diameter Apollinaris Patera (volcano) Northern Lowl in addition to s Southern Highl in addition to s Ma’Adim Vallis x Orbiter view (MRO HiRISE) Husb in addition to Hill in addition to Inner Basin ground view (MER Pancam) Importance of Age in addition to Depth in Crust

MSL Science Team Field Site Discussions – Mawrth Oyama Crater & Mawrth Vallis Oyama (107 km diam) c in addition to idate MSL field site “Mawrth mouth” regolith covers bedrock in the ‘intermediate gray’ areas – some of that regolith is considered to be eolian-deposited dust in addition to /or crusted eolian dust (e.g., Presley in addition to Arvidson 1987) bedrock exposures have a light tone; some dark-toned materials in this area are also bedrock (commonly but not always a caprock above light-toned rocks) note Oyama as long as med in light-toned bedrock Note: C in addition to idate l in addition to ing ellipse size in addition to shape is approximate. The name “Oyama” was approved by the IAU 26 March 2010. Named as long as Vance I. Oyama, Viking Gas Exchange Experiment PI. MGS MOC red wide angle mosaic Pilbara Craton in addition to Hamersley Range, W. Australia

Mars Global Surveyor MOLA Topography Marine Chlorophyll Abundances (Low Moderate High)

Key Factors: Paleo-productivity Sedimentary redox Mineralogy Lithification Later alteration Pilbara Craton in addition to Hamersley Range, W. Australia Preservation of Evidence about Ancient Mars Noachian-Hesperian environments in addition to processes Persistence of ancient aqueous environments Noachian deposits in aqueous environments Phyllosilicate-rich deposits in addition to organic matter contents Preservation potential of the four “finalist” MSL sites Age of deposits: mid-Noachian to early Hesperian Water persistence: effects of elevation in addition to geologic age Allochthonous vs autochthonous phyllosilicates Redox state of deposit Lithification: rate in addition to extent

Shaw, Mike WJTY-FM News Director www.phwiki.com

Shaw, Mike News Director

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