2_1A_SedMetaRocks

Granite felsic igneous rock granite common rock type

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Unformatted text preview: and volcanism. Granite: felsic, igneous rock Granite: Common rock type in continental crust The Stawamus Chief, Squamish (granodiorite) Large crystals = slow cooling Basalt: mafic, igneous rock Basalt: Erupted at many volcanoes Comprises much of the upper oceanic crust Colin Zelt tempting fate. Kilauea, Hawaii Source: B.Zelt Rock Types Rock Igneous, Sedimentary, and Metamorphic 1) Igneous: formed by the solidification of magma Subclassifications: a) Composition [Felsic - Intermediate - Mafic … ultramafic] b) Cooling Environment i) Intrusive • a molten rock that buoyantly rises into existing solid rock and solidifies there slowly recall rock is a • large crystals in granite good insulator ii) Extrusive • a molten rock that buoyantly rises to the surface (e.g., exposed to the air, into the ocean,…) where it solidifies quickly • small crystals in basalt, no crystals in glass Igneous Intrusives and Extrusives Igneous (same rock composition, different cooling environment) Small crystals = fast cooling Large crystals = slow cooling Igneous Intrusives Igneous Caulfield dike, Lighthouse Park, Vancouver, BC Lighthouse A dike (light colour) intruded into the pre-existing...
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