Tectonics Terrestrial Planets2
What do we mean by “tectonics?”: What do we mean by “tectonics?” Movement of a planet’s surface Movement = ??? What Drives Tectonics?: What Drives Tectonics? What Drives Tectonics?: What Drives Tectonics? Types of Movement: Types of Movement Types of Movement: Types of Movement Types of Movement: Types of Movement Slide9: Mercury Geologically inactive (3.7 Ga) Features resulting from compressive forces Slide10: Venus Possibly geologically active Volcanoes = heat loss Lava flows (craters young) Thick crust; convecting mantle Wrinkle ridges, extensional zones Slide11: Alpha Regio Tesserae - highly deformed older terrain (< 1 Ga) More cratered Embayed by lava flows Slide12: Maat Mons – 8 km high, Aphrodite Terra Region Slide13: Mars Probably geologically active Volcanoes = heat loss Thick crust; convecting mantle Wrinkle ridges, extensional zones - BIG Slide14: Olympus Mons 24 km high 550-600 km across Thick crust! Mars: Mars dfldjfkdkfj Volcanoes on Mars: Volcanoes on Mars http://volcano.und.nodak.edu/vwdocs/planet_volcano/mars/Overview.html Martian Volcanoes: Martian Volcanoes Less gravitational pull; volcanoes larger before collapsing under own weight Hot spots and crust are stationary Slide18: It’s still all about heat loss! Slide19: Heat from Impacts, differentiation, radioactive decay Differentiation of layers Continued differentiation - volcanism, tectonism All are differentiated All have been cooling – unique signature Moon and Mercury – solid core; geologically inactive; conduction Mars and Venus – solid core; geologically active; convection in mantle Earth ….
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