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2005 canyons canyons volcanoes

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Unformatted text preview: eem more primitive? Mars (continued) Annual Atmospheric Pressure Annual Atmospheric Pressure Variations Dunes Polar Regions Rayed Impact Craters Rayed Impact Craters Tornabene, et al., 2005 Canyons Canyons Volcanoes Olympus Mons shield volcano 18 km above the surrounding plains (Mauna Loa rises 8.8 km above seafloor) 600 km diameter (Circumscribes 2.65 X area of Ohio) Basal cliff up to 6 km high (landslides) Young (perhaps still active) Why is it so big? (plume without plates) Tharsis Martian Meteorites All are igneous rocks of basaltic or ultramafic composition. SNC = shergottite (basalt or gabbro), nakhlite (clinopyroxenite), chassignite (dunite), ALH84001 (orthopyroxenite) Best evidence for Mars origin is trapped gases Radiometric ages of SNCs are generally very young, less than 1.3 b.y. The exception is ALH84001, which has an age of 4.5 b.y. Spirit rover in Gusev crater Bonus question: who took this photo? Humphrey Humphrey Normative Mineralogy Adirondack/Humphrey/Mazatzal Diopside Pyroxenes Olivine (Fo55/52/51) 14/13/13% Hypersthene 31/26/35% 6/13/0% Magnetite 1.2/1.3/1.7% 4.4/4.3/2.6% Ilmenite Chromite 0.9/1/0.9% 0.9/0.9/0.8% 41/39/44% Plagioclase (An4...
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