1 Martian Paterae: Tyrrhena and Hadriaca GLY 424/524 March 6, 2002 Tyrrhena Patera Martian Volcanic Provinces Tyrrhena Patera Hadriaca Patera Amphitrites Patera Apollinaris Patera Alba Patera Martian Paterae • Shallowly sloping flanks (<2°) • Summit caldera/caldera complex • Flanks dissected by radial channels – Channels different sizes on different volcanoes – Channels different orientations on different volcanoes • Originally proposed to be shield volcanoes built from fluid basalts (Mariner 9) • Now generally believed to be composed of pyroclastic deposits Martian Paterae • Circum-Hellas – Tyrrhena Patera – Hadriaca Patera – Peneus Patera – Amphitrites Patera • Alba Patera (Tharsis) • Apollinaris Patera (Elysium) Tyrrhena Patera
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