EES 1030 Lecture Notes - Lecture 6: Igneous Rock, Ultramafic Rock, Flux Melting
16 Feb 2018
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Document Summary
A rock: a naturally occurring solid aggregate of minerals. Cool from completely molten material, 90% of earth"s crust. Fractionation of melt (the molten material) as it rises. Way the material solidified: rate of cooling, intrusive (subsurface, magma) vs extrusive (extruded out of the volcano as lava) Decrease pressure (decompression melting) (lowers the rocks melting point) Add water (fluid-induced or flux" melting) liquid portion (melt) Where did the melt form (oceanic, continental, mantle) So that mineral is removed from the molten material, and is no longer the same as the rock that it melted from. You can change the conditions (pressure, temp, etc) without completely cooling the melt, There is a specific order that they cool: bowens reactions series. Easy for atoms to migrate if it stays hot. Harder for atoms to migrate if material cools very rapidly and so as minerals crystalize the melt"s composition changes. Viscosity: how easy it is for atoms to move around.
