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Mars: Second Order Landscapes

Geography 441/541 F/19 Dr. Christine M. Rodrigue. Mars: Second Order Landscapes. Mars: Second Order Landscapes. The Impact Basins Isidis Planitia Where Beagle was to land 1500 km wide crater basin Missing NE rim. Mars: Second Order Landscapes. The Impact Basins

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Mars: Second Order Landscapes

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  1. Geography 441/541 F/19 Dr. Christine M. Rodrigue Mars: Second Order Landscapes C.M. Rodrigue, 2019 Geography, CSULB

  2. Mars: Second Order Landscapes • The Impact Basins • Isidis Planitia • Where Beagle was to land • 1500 km wide crater basin • Missing NE rim C.M. Rodrigue, 2019 Geography, CSULB

  3. Mars: Second Order Landscapes • The Impact Basins • Isidis Planitia: Modifications • Thermal inertia (map: Caprarelli & Orosei 2015) C.M. Rodrigue, 2019 Geography, CSULB

  4. Mars: Second Order Landscapes • The Impact Basins • Isidis Planitia: Modifications • Gullying in Libya Montes, south rim of Isidis (HiRISE) C.M. Rodrigue, 2019 Geography, CSULB

  5. Mars: Second Order Landscapes • The Impact Basins • Isidis Planitia: Modifications • Possible Deuteronilus Contact of northern ocean? (HiRISE) C.M. Rodrigue, 2019 Geography, CSULB

  6. Mars: Second Order Landscapes • The Impact Basins • Isidis Planitia: Modifications • Dunes (MOC) • Thumbprint terrain (MOC) • Rootless cones? • Moraines and eskers? C.M. Rodrigue, 2019 Geography, CSULB

  7. Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Lava basin antipodal to Argyre • Very smooth surface, much of it covered with lavas from Elysium volcanoes C.M. Rodrigue, 2019 Geography, CSULB

  8. C.M. Rodrigue, 2019 Geography, CSULB Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Circular grabens, some of them double • Draping of cover material (sediment?) over buried craters • Folding and compaction into depressions creates grabens on inner slopes of buried craters’ rims • Sometimes shrinkage of cover material exerts tension leading to grabens just beyond buried crater rim

  9. Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Circumferential rings of grabens reveal buried crater structure • Buried “quasi-circular structures” – old craters under smooth lowlands surface, including over Utopia itself C.M. Rodrigue, 2019 Geography, CSULB

  10. Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Lava basin antipodal to Argyre • Viking 2 frost documentation C.M. Rodrigue, 2019 Geography, CSULB

  11. Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Patterned ground typical of high latitude Northern Lowlands • Scalloped pits: sublimation of subsurface ice, thermokarst C.M. Rodrigue, 2019 Geography, CSULB

  12. Mars: Second Order Landscapes • The Impact Basins • Utopia Planitia • Pedestal craters in abundance (HiRISE) • Subsurface ice → wet splat effect C.M. Rodrigue, 2019 Geography, CSULB

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