GEOL 212 Study Guide - Quiz Guide: Subduction, Terrane, Carbonatite
26 Dec 2017
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Document Summary
According to impact geochronology: mars" mare-like lava plains are ancient - 3 - 3. 5 ga, formed by an ancient process (plate tectonics?) In contrast, its giant volcanoes are younger. (1 - 2 ga). The youngest lavas on olympus mons may be as young as 20 ma. Mars" identifiable volcanoes are limited to three regions. The first two have been recognized for decades: the tharsis plateau (right, the elysium plateau. Both are known for giant shield volcanoes like arisa mons. Martian supervolcanoes: we have discussed the tectonic significance of mars" giant hawaii-style shield volcanoes (no lateral plate motion). They seem mostly to represent effusive eruptions of mafic magma. Maybe mars" air was thicker when they were going off, but that much thicker?. There ought to be signs of explosive eruptions if. Mars is like an alternate earth with thin air and lower gravity. Until 2013, few sites on mars have been interpreted as the result of explosive eruptions.
