GEOL 212 Study Guide - Midterm Guide: Igneous Rock, Mantle Convection, Continental Crust
14 Nov 2017
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Comparative tectonics of the outer solar system: io, has 30 times the surface heat of earth. Igneous rocks: rocks that form via the solidification of magma. In the mantle, heat is brought upward by convection. As hot rocks convect upward they transfer heat to cooler rocks lying above them, which may melt: pressure: the greater the pressure, the less likely materials are to melt. When rocks experience decompression without losing their heat, they can experience decompression melting: volatile substances: the addition of substances like water or carbon dioxide to a mineral lowers its melting point. In this case, the shape of the melting curve for peridotite changes: where magma forms on earth, mid-ocean ridges: rising rocks in mantle convection cell bring heat near the surface, transferring heat to overlying rocks. At the same time, the hot rising mantle rocks experience decompression melting.
