GEOL 1610 1st Edition Lecture 3 Outline of Last Lecture I Oxides II Carbonates III Sulfates IV Sulfides V Halides VI Native Elements Outline of Current Lecture I Igneous Rock II Magma III Lava important points IV Origins of magma V Divergent plate Boundaries VI Convergent Plate Boundaries VII Crystallization VIII Igneous Textures IX Most important intrusive rick textures X Chemistry of Igneous Rocks XI What is Bowen s Reaction series XII How do magmas change XIII Economic important of igneous rocks Current Lecture I Igneous Rock These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a Rocks are formbed by the crystallization of molten rock b Two classes are i Intrusive plutonic from magma ii Extrusive from lava II Magma important points a Molten material in subsurface chambers b Different sources i Mantle deep ii Crust shallow c Different compostion i Quartz content ii Other elemtens iii Volatiles gasses water III Lava important points a Molten rock extruded to a surface b Underwater or to the air IV Origins of magma a Divergent plate Boundaries i Mid ocean spreading centers ii Basaltic composition b Convergent plate boundaries i Ocean Ocean Islandarc These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ii Ocean continent Continental mountains V Divergent plate Boundaries a Continental separate crust and mantle sources b Oceanic single mantle course VI Convergent Plate Boundaries a Mixture of the mantle and continental magmas b Form huge intrusive cores of mountain ranges called Batholiths VII Crystallization a Reverses the process of Melting i Silica tetrahedral first ii Different minerals form during cooling iii Crystals have different 1 Compolition mineralogy 2 Size texture b Most important controlling factors i Quartz SiO2 content ii Volatiles gasses water iii Location intrusive vs extrusive VIII Igneous Textures a Controls i Rate of cooling ii Silica content These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute iii Dissolved gasses water b Environment of Formation i Extrusive volcanic 1 Rapid cooling rapid crystal growth 2 Small crystals ii Intrusive plutonic 1 Slow cooling prolong crystal growth 2 Large crystal IX Most important intrusive rick textures a Phaneritic large interlocking crystals intrusive b Aphanitic very large interlocking crystals extrusive c Porphrytic larger crystals phenocrysts in a groundmass of fine crystals extrusive or very shallow X Chemistry of Igneous Rocks Elements Minerals Character Felsic Matic SiO2 Fe K Al Na Mg Ca Quartz Ca feldspar K feldspars Mica Olivine Pryoxenes Light Dark Continental Oceanic Lo temp Hi temp a 6 most important rocks These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute SiO2 K Al Fe Mg Ca intrusive Granite Gabbru extrusive Rhyolite Basalt Continental Oceanic Also andesite extrusive XI Diorite intrusive What is Bowen s Reaction series a Temperature Based mineral stability sequence b Discontinuous and continuous reactions i Olivine through Biotite Disc ii Ca through Na rich feldspars cont c Shows mineral formation sequence d Shows relative mineral stability i Resistance to weathering XII How do magmas change a Magmatic Differentiation i Settling and laagering of magmas 1 Enrichment in Lo temp ions 2 Si O Al K ii Assimilation and Mixing 1 Incorporation of country rock 2 Merger of magma chambers These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute XIII Economic important of igneous rocks a Metals b Hydrothermal deposits c Pegmatite d Placers e Chromium f Copper mercury gold platinum silver lead zinc titanium These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute