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Clastic Rocks Sedimentary rocks Composition • There are three types of sedimentary rock composition • Clastic (detrital)- that are formed from mechanical weathering debris • Chemical- that form when dissolved materials precipitate from a solution • Organic- form from the accumulation of plant or animal debris Sedimentary Rocks • Sedimentary rocks are then broken down by the two major textures that they display • Clastic – meaning that they are composed of discrete particles that are compacted and cemented together • Non-clastic – This means that they are consisting entirely of crystals (forming from chemical compostion) Conglomerate • Clastic (detrital) compositions • Clastic texture • Is formed from water currents (mechanical weathering) • Made up from gravel and sand particles Sandstone • Clastic (detrital) compositions • Clastic texture • Formed from mechanical weathering • Made up of sand sized particles cementer together by calcite, silica, and iron oxides Quartz sandstone • Clastic (detrital) compositions • Clastic texture • Formed from mechanical weathering • Comprised of quarts grains cemented together by silca
