GEOL 104 Lecture Notes - Lecture 8: Biotite, Pyroxene, Muscovite

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Sheet structure: as it cools more complex structures form in the order above, magnetic differentiation. Formation of one or more secondary magmas from a single parent magma. During crystallization solid and liquid components can separate. Magmatic differentiation and component separation at various stages produces different types of igneous rocks: intrusive and extrusive exact same, what erupts on surface reflects what is beneath the surface. Changing a magmas composition by the incorporation of foreign matter (surrounding rock bodies) into magma. Magma interacting with the rock around it. If hot enough with break off chunks of surrounding rock and melt them into the magma. Changes the magmas composition: magma mixing. Occurs when one magma body intrudes another: partial melting and magma formation. Incomplete melting or rocks is known as partial melting. Differentiates the magma: formation of mafic (basaltic) magma. Most originates from partial melting of peridotite in the mantle.

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