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Mars: Second Order Landscapes

Explore geological features of Isidis and Utopia Planitia impact basins on Mars, including crater modifications, grabens, and possible ocean contacts. Discover mysteries of Martian dunes, thermal inertia, and pedestal craters.

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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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