EESC1180 Lecture Notes - Lecture 4: Partial Melting, Magnesium, Mantle Plume
19 Sep 2017
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Document Summary
Bond one or more elements together into crystals, the building blocks of minerals. Put together a mixture of one or more minerals to make an aggregate - rock. Rocks can be observed where they stick out -outcrops. Extrusive igneous rocks cool when they reach the surface. The crust and asthenosphere are actually mostly solid rock, but melts occur in localized areas. Molten rock, including any suspended crystals and dissolved gases. Igneous rocks are formed when magma cools and crystallizes. Rocks can be classified in 2 ways. There are three geologic environments that allow for decompression melting. Water is a volatile and breaks chemical bonds and can break things down. Conducts from adjacent rocks to melt as well. See rock melting video for more explanation (on smartwork5) Rocks melt at different times because they"re made of different minerals - partial melting. Partial melting of wall rock creates new magma which mixes with magma below.
