GEO 102 Lecture Notes - Lecture 12: Kerogen, Sedimentary Rock, Aragonite
15 Oct 2016
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Document Summary
Sedimentary rocks can form by: shell fragments or carbon rich relics of plants, precipitation of minerals from h2o(water) solution, cementing together of loose grains of pre-existing rocks. Rocks that solidify from a melt are called igneous rocks. Breccia- sedimentary rock composed of angular pebble-sized fragments surrounded by matrix. Arkos contains sand-sized particles made of quartz and feldspar. Precipitation is a process associated with the formation of travertine. Travertine (chemical limestone) is crystalline calcium carbonate caco3 that has precipitated out of groundwater. Shale is a sedimentary rock that is composed of clay-and-silt sized grains that breaks in thin sheets: only shale and mudstone are composed of silt-and-clay sized pieces, but mudstone doesn"t break into thin sheets. Fossiliferous limestone, chalk, and micrite contain the mineral calcite. Biochemical limestone composed of mineral calcite or its polymorph aragonite. Chert is composed of the mineral quartz (silicecus)
