RocksRock climbersEl CapitanYosemite mapRock typesThe rock cycleRock cycle Basaltic lava splashbasalt Rhyolite: Fine-grained igneous textureScoria: basaltCoarse-grained igneous texture Porphyritic igneous texturePorphyritic Andesite Porphyritic graniteObsidian exhibits a glassy texturepumiceClassification of igneous rocksMagma typesMagma componentsGraniterhyoliteClassification of igneous rocksbasaltgabbroClassification of igneous rocksandesiteHornblende phenocrysts in andesitePorphyritic Andesite Porphyritic andesitedioriteBowen’s Reaction SeriesHalite/Sylvite mineBingham Copper Mine1RocksReading Chapter 3Pages 51-78Review questions:1, 2, 3, 4, 5, 17, 18Rock climbersEl Capitan Yosemite mapRock types• Igneous rock• Sedimentary rock • Metamorphic rock• Melting—Magma The rock cycle2Rock cycle "shortcuts" or interruptions • Sedimentary rock melts • Igneous rock is metamorphosed • Sedimentary rock is weathered • Metamorphic rock weathers Basaltic lava splashbasaltRhyolite: Fine-grained igneous textureScoria: basaltCoarse-grained igneous texture3Porphyritic igneous texturePorphyritic Andesite Porphyritic granite• http://www.soc.soton.ac.uk/soes/resources/collection/minerals/igne-1/pages/ig10.htmObsidian exhibits a glassy texturepumiceClassification of igneous rocks4Magma types• Felsic—high silica• Mafic—only about half silica• Intermediate—by mixing of those two• Ultramafic—from mantle meltingMagma components• http://volcanoes.usgs.gov/Products/Pglossary/VolRocks.htmlGranite rhyoliteClassification of igneous rocksbasalt5gabbroClassification of igneous rocksandesiteHornblende phenocrysts in andesite• http://www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousCompositions/5Andesite.htmlPorphyritic Andesite Porphyritic andesite• http://www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousCompositions/5Andesite.html6dioriteBowen’s Reaction SeriesHalite/Sylvite mine Bingham Copper
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