GEOL107 Lecture Notes - Lecture 4: Muscovite, Silicate Minerals, Lithification
27 Jul 2018
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09. 07. 2017: volcanoes and plutons, continued , types of plutons. Found 2 major types of process taking place as magma in laboratory cooled: discontinuous reaction series, distinct silicate minerals being formed within distinct temperature ranges. Sodium (na) rich: ca rich plagioclase feldspar called anorhite, na rich plagiocalse feldspar called albite, calcium leaves magma (goes to rock) earlier (at higher temperatures) than. Fractional crystallizaton: when sequential minerals form and removed from magma as temperature decreases, at highest temperatures minerals like olivine, pyroxene, and calcium-rich plagioclase feldspar form, at lowest temperatures minerals like muscovite and stuff forms. Forming magma: 3 factors determine where and when rock will begin to partially melt (create magma, 1. Pressure lower pressure can cause rocks to begin to melt (decompression melting: 2. Temperature raising temperature can bring rocks to melting temperature: 3. Presence of water lowers melting temperatures of rocks. Definition: naturally occurring aggregate (combination) of minerals.
