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chapter5study guides - GLG111 Study Guide Spring 2009...

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GLG111 Study Guide Spring 2009 Chapter 5: Igneous Rocks, p, 106-135 Define the following: Igneous Rock: form from solidification of magma, lava, or pyroclastic material Lava: liquid rock above the surface Magma: liquid rock below the surface Pyroclastics: material thrown out by a volcano (tephra) Bowens Reaction Series: determines what minerals form at what temperature Igneous Rock Classification A. Texture : refers to the sizes, shapes, and arrangement of different components. Types of texture found in Igneous Rocks: 1. Phaneritic (coarse-grained): (granite, diorite, gabbro) 2. Aphanitic (fine-grained): (rhyolite, andesite, basalt) - Vesicular: pumice - Glassy: obsidian - Fragmental: tuff/tephra 3. Porphoritic: large crystals in a finer grained rock B. Mineral and chemical composition : - Ultra Mafic: Peridotite (magnesium and iron, green olivine) - Mafic: less silica, more magnesium, iron, calcium: dark! Gabbro basalt - Intermediate: between felsic and mafic (diorite, andesite) - Felsic: silica (quartz, feldspar) (granite, rhyolite) 1
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GLG111 Study Guide Spring 2009 Type
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