6 Sediments - unconsolidated particles created by 1. The weathering of rock2. The secretions of organisms or decomposition of organic matter3. Chemical precipitation
7 Sedimentary Rock Formation Weathering – breakdown both physically (clasts) or chemicallyErosion – loosening of weathered products (clasts) and initial transportTransportation – movement of materials via wind, water, or ice; sorting and rounding can occurDeposition – material settles out of the transporting mediumLithification – process of either cementation or compaction of the material
9 Sedimentary Rocks Composed of lithified sediments by compaction – weight of overlying sediment compresses sediment, important in fine-grained sedimentsby cementation – materials carried in solution precipitates minerals - iron oxides, carbonates, silicaTwo Classifications- clastic-nonclastic
11 Sedimentary RocksClastic Rock – composed of fragments of preexisting rocks.Nonclastic Rock – composed of chemical precipitates or biochemical matter.
12 Daily QuestionUse a Venn diagram to compare and contrast clastic, chemical nonclastic, and biochemical nonclastic sedimentary rocks. Identify at least five characteristics.ClasticChemicalBiochemical
13 Types of Sediments - Clastic Broken fragments of rock produced by weathering.Classified according to size.Range in size from largest boulder to smallest clay particle.
14 Clastic TextureIncreasing distance from sourceThe size, shape, and distribution of particles that collectively make up a rockIncreasing distance from source
15 Which sample is closer to the source of sediment?
16 Sorting - a function of transport mechanism 1. Water2. Wind3. Glaciers