32 - Polymorphic Phase Transformation (See in picture, the...

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20:34 Mantle Made of ultramafic rocks (mafic = iron and magnesium, rich in metals) Olivine (Me, Fe) SiO 4 Pyroxene (Mg, Fe) SiO 3 Speed of a P-wave traveling through the Earth     DIAGRAM 1 Crust has relatively low elastic modulii  As you go down, elastic modulii increases, which makes the speed of the wave  increase Different Material as you go down  So waves propagate much faster Lithosphere—includes crust but also includes the upper most part of the mantle Lithosphere/Asthenosphere boundary is mechanical Rocks above behave differently than the rocks below. Crust, Mantle, Core = Compositional Boundary Different stuff on either side of those boundaries  See “Low Velocity Zone” b/w 100-200 km Asthenosphere Lithosphere is about 0-100 km
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Unformatted text preview: Polymorphic Phase Transformation (See in picture, the flat part) Ex: Diamond In response to increase in temp and pressure, the atoms are always going to be in equilibrium to their context More and more rock on top, there is some packing, push on those atoms as much as they can stand, once they cant stand anymore pressure they under go a polymorphic phase transformation Collapsing of structure, DONT CHANGE MATERIALS, the atoms just get packed more closely together Reorganize themselves Olivine changes into Spinel at deeper depths 2 ways to get Diamonds to the surface = 1. continental Collision 2. Kimberlite Pipes South Africa 20:34 20:34...
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32 - Polymorphic Phase Transformation (See in picture, the...

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