492-pp10 - UNIVERSITY OF SOUTH ALABAMA Last time. Mars Part...

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1 ES 492 (H): Planetary Geology Lecture 10: Mars Part 2 Soft Rock Geology; Sedimentary Processes UNIVERSITY OF SOUTH ALABAMA Phobos: the doomed moon! ht p:/ antwrp.gsfc.nasa.gov/apod/image/0612/phobos_hiresme_big.jpg Origin of sediment Last time… 1. Introduction to Mars 2. Imaging Mars 3. Hard rock geology of Mars Mars Part 1: Hard rock/Tectonics Mars Historical Information •Known by the ancients. •Named for the Greek God of War because of its red colour. •Percival Lowell though he saw canals on Mars •First visit by a spacecraft was in 1964 ( Mariner 4 ; flyby) •15+ “successful” visits to date; Mariner 6/7 (1969) showed that ice caps were CO 2; first orbital survey of any planet ( Mariner 9 , 1971); first landing ( Viking 1 , 1975); best orbital imagery (Global Surveyor, 1997-2006); first robotic rover ( Pathfinder , 1997) •Most recent visit (2005-present) by Reconnaissance Orbiter ht p:/ antwrp.gsfc.nasa.gov/apod/image/ Hard vs. Soft Rocks Last time Last time This Time This Time Today’s Agenda 1. Recap of Mars geological time 2. Water on Mars 3. Wind on Mars It’s 3D glasses day! Look for me!
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2 Recap: Martian Geology Surface topography The Mariner spacecraft demonstrated that the northern and southern hemispheres of Mars were different from one another (crater density and topographic height) high crater density low crater density Water on Mars Liquid water on Mars Melt water on Mars No liquid water On Mars Water on Mars Noachian Eon (4.6 to 3.5 Ga) •major cratering •large impact basins •global volcanism •liquid water Northern Mars with postulated shorelines to ancient oceans (c 2.0+ GA). Source: Perron et al. (2007) Water on Mars htp:/antwrp.gsfc.nasa.gov/apod/image/0206/marslakes_topomap_big.jpg Ma'adim Vallis, one of the largest canyons on Mars may have been carved by running water. (c 3.5+ GA). Noachian Eon (4.6 to 3.5 Ga) •major cratering •large impact basins •global volcanism •liquid water erosion ht p:/ summit.fas.harvard.edu/~perron/lib/exe/ Water on Mars Noachian Eon (4.6 to 3.5 Ga) •major cratering •large impact basins •global volcanism •liquid water erosion Hesperian Eon (3.5 to 2.5 Ga) •less numerous impacts •more localized volcanism •Melt water erosion ht p:/ sci.esa.int/science-e-media/img/65/IaniChaos-AresVal is_erosion2-410.jpg Catastrophic flow? Water on Mars
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3 Noachian Eon (4.6 to 3.5 Ga) •major cratering •large impact basins •global volcanism •liquid water erosion Hesperian Eon (3.5 to 2.5 Ga) •less numerous impacts •more localized volcanism •meltwater erosion Amazonian Eon (2.5 to 0 Ga) •rare volcanism •no liquid water •isolated impacts ht p:/ www.celestialmonochord.org/photos/uncategorized/esa_water_on_mars.jpg Water on Mars Noachian Eon (4.6 to 3.5 Ga) •major cratering •large impact basins •global volcanism •liquid water erosion Hesperian Eon (3.5 to 2.5 Ga) •less numerous impacts •more localized volcanism
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492-pp10 - UNIVERSITY OF SOUTH ALABAMA Last time. Mars Part...

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