GEOL 1330 Chapter Notes - Chapter 4: Igneous Rock, Silicate Minerals, Magma Chamber
7 Mar 2017
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Document Summary
Andesitic (intermediate composition) a compositional group of igneous rocks that contains at least 25% dark silicate minerals. Aphanitic texture a texture of igneous rocks in which the crystals are too small for individual minerals to be distinguished without the aid of a microscope. Assimilation in igneous activity the process of incorporating country rock into a magma body. Bowens reaction series concept proposed by n. l. bowen that illustrates the relationships between magma and the minerals crystallizing from it during the formation of igneous rocks. Crystallization formation and growth of a crystalline solid from a liquid or gas. Crystal settling process that occurs during the crystallization of magma, in which earlier-formed minerals are denser than the liquid portion and settle to the bottom of the magma chamber. Extrusive igneous activity that occurs at earth"s surface. Decompression melting melting that occurs as rock ascends to a drop in confining pressure.
