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MARS TECTONICS & VOLCANOLOGYZachary Gallegos
University of New Mexico / Mars One
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Mars Orbiter Laser Altimeter Map
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Plate Tectonics• Lithospheric plates sliding
on the asthenosphere, above the mantle
• Exists on Earth
• Theory proposed in the early 1900’s
• Does it exist on other bodies in the solar system?
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Plate Tectonics• Recycles material
• Regulates the atmosphere• CO2 sequestration and output
• Linked with mantle convection• Push new material to surface
at divergent boundaries• Pulls old material into the
Earth at convergent boundaries
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Tectonics of Earth• Picture of plates
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Plate boundaries
• Divergent• Spreading apart
• Convergent • Moving together
• Strike-slip• Sliding past
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Divergent
• Mid-Atlantic ridge• Oceanic
• East African Rift• Continental
• Rio Grand Rift• Continental
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Convergent
• Mariana Islands/Trench • oceanic-oceanic
• Pacific Northwest • oceanic-continental
• Himalayas • continental-continental
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Strike-slip
• San Andres fault • right lateral
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Tectonics of Mars
• Mars seems to lack global, Earth-like tectonics• Too small?• Not enough water?
• Large scale faulting
• HUGE scale rifting
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Topography
• Mars’ planetary dichotomy• Not tectonic in origin
• Bolide impact , water resurfacing
• Slow sloping at the dichotomy• not pronounced
• Earth’s dynamic lithosphere• Tectonic in origin• Steeply sloping at the margins
• Continental and oceanic crust
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Magnetics • Mars lacks a current magnetic field
• Magnetic reversals recorded on Earth
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Magnetics• Possible magnetic reversals recorded in early Martian crust
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Interior of Mars• Smaller/colder
• Less water
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Faulting• Tectonic movement
• Normal (extension)
• Reverse (compression)
• Strike-slip (lateral)
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Faulting on Mars• Thrust faulting
• Amenthes Rupes
• Normal faulting• Circum-Tharsis
• Strike-slip faulting??• Within Valles Marineris
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Faulting on Mars• Circum-Tharsis
• Extensional faulting
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Valles Marineris• Giant tectonic fissure in
the crust• Not the result of plates• Result of Tharsis uplift
• Length: > 4,000km
• Width: > 200km
• Depth: > 7km
• Largest known valley in the solar system
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Valles Marineris• Nearly ¼ or the planets circumference
• Nine times longer than the grand canyon
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Vallis Marineris
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Volcanology• Study of volcanoes
• Volcanoes bring new material to the surface from below• Lava, ash, gas
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Volcanology of Earth• Most of Earth’s volcanism is related to plate tectonics
• Divergent and convergent boundaries
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Volcanology of Mars• No planetary tectonics
• Shield forming• Hot spot volcanism (e.g. Hawaii)
• Mostly basaltic in compositions• From ultramafic komattiatic to dacitic
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Rocks and Minerals• Mars has a different volcanic signature than Earth
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Why Basalt?• Hot spot volcanism produces basalt
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Volcanism and Tectonics• With no tectonics, volcanoes grow to enormous size
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Montes• Mons are large shield volcanoes
• Earth analogue: Hawaii
• Gentle slopes < 6°
Ascraeus Mons Pavonis Mons Arsia Mons
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Tholi• Tholus is a term for
smaller, dome shaped volcanoes• Older than Mons
• Buried by later flows
• Steeper flanks
• Different material than Montes?
• Less material than Montes?
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Patera• Term given to small volcanoes with large calderas
• Latin translation: shallow drinking bowl
• Larger calderas than the tholi
• Probably represent larger volcanoes
• Buried beneath flows and sediment
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Rootless Volcanoes & Pseudocraters• Show no sign of magma conduit
• Analogues on Earth erupt due to a magma body flowing over a surface or subterranean water source
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Martian Volcanic Provinces
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Tharsis• Largest volcanic province on Mars
• 25% of the planets surface
• Avg. 7-10km above datum
• Youngest flows on Mars
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Tharsis
Arsia Mons
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Olympus Mons• Largest mountain in the solar system
• Height: > 22km
• Diameter: > 500km
• Slope: ~ 4°
• 6 nested calderas• 3.5km deep
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Alba Mons• North of Tharsis buldge
• Very low slopes ~ .5°
• 1600km across
• Rises 3km above plains
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Elysium• Second largest volcanic
province• 1,700x2,400 km
• Elysium Mons• 13km high
• Hecates Tholus• North
• Albor Tholus• South
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Syrtis Major
• 1200km across
• 2km high
• 2 calderas• Nili Patera, Meroe Patera
• Silica rich rocks• Dacite & Granite
Isidis Basin
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Highland Patera• Near the Hellas impact basin
• Impact induced volcanism along fractures?
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Arabia Terra• Low relief Patera
• Structures that look like Earth’s supervolcanoes• e.g. Eden Patera
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Questions?
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Geography of Mars
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Volcanic Provinces
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Exploration Sites