EPSC 201 Lecture Notes - Lecture 12: Subduction, Laccolith, Igneous Rock
30 May 2016
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Document Summary
Intrusive settings: geologists categorize intrusions by shape, tabular (sheet) planar with uniform thickness, blister shaped a still that domes upward, balloon shaped blobs of melted rock, tabular intrusions, tend to have uniform thicknesses, often can be traced laterally, have two major subdivision. Dominate in extensional settings: sills, are injected parallel to preexisting layering, are usually intruded close to the surface, both dikes and sills exhibit wide variability in, size, thickness (or width, lateral continuity, tabular intrusion, dikes cut across rock layering. Igneous rock is used extensively as building stone: office buildings, kitchens, why, durable (hard, beautiful, often called granite; it is not always true granite, useful descriptions of igneous rock, color (light or dark, texture, the size, shape and arrangement of the minerals, crystalline interlocking crystals fit like jigsaw puzzle, fragmental pieces of preexisting rocks, often shattered, glassy made of solid glass or glass shards, texture directly reflects magma history.
