EAPS 11600 Lecture Notes - Lecture 9: Continental Crust, Silicate Minerals, Mafic
22 Mar 2019
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Source material determines rock type and behavior of the melt. Internal temps. of planetesimals increase with size. (due to increased compression, kinetic energy from collision, and radioactive decay) With melting heavier elements move inward to form core lighter material forms the outer mantle. Melted source material for igneous rocks is called. Composition-proportion of different minerals present in the rocks. Crystal size (texture) and composition are used to subdivide crystalline igneous rocks. Melt or melted rock is the source material (magma) that produces igneous bodies that cool below the crust, as well as, the material that erupts at the surface (lava) How melt behaves depends in part upon the composition of the rock that is melted. The key property of these materials is there silica content which controls their viscosity or ability to flow. The ability to flow is a function of composition, specifically silica content.
