GEOG 1266 Lecture Notes - Lecture 1: Diorite, Extrusive Rock, Peridotite
30 Mar 2017
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Earth"s crust: oxygen 47, silicon 28, aluminum 8, iron 5, ca, na, k, mg 2. 3% each. Same chemical composition and physical structure regardless of form or what has happened to it. Igneous: begins as magma or lava, and cools and hardens. Rock that has been formed by magma or lava. Magma cools and forms rock at or near earth"s surface. Magma cools and forms rock far beneath earth"s surface. Felsic (si, al) mafic (fe, mg: granite 2. Sedimentary: formed from the accumulation of sediment, compaction, and lithification (hardening-1000s of years) of sediment. Depositional environment: where the material was deposited: low energy environments: bottom of ocean. Low energy=fine particles deposit: high energy environment: areas near the coast. Energy associated with the waves creates sand accumulate. High energy=big particles deposit: clastic: particle of sediment. Gravel: shale: mostly clay, siltstone: mostly silt, sandstone: sand, conglomerate: sand and gravel, organic:
