7._Sediments___Sedimentary_Rocks_white

7._Sediments___Sedimentary_Rocks_white - Sediments...

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Unformatted text preview: Sediments & Sedimentary Rocks Garden of the Gods, Colorado Sedimentary Rocks Produced from weathering products of pre-existing rocks or accumulated biological matter Detrital rocks produced from rock fragments Chemical rocks produced by precipitation of dissolved ions in water Organic rocks produced by accumulation of biological debris, such as in swamps or bogs Granite Grus Death Valley Salt Flats Coal Swamp Sedimentary Rocks Sedimentary rock types and sedimentary structures within the rocks hold clues to past environments Modern Sand Dune in Morocco and Cross-bedded dune Sandstone in Utah wiki Sedimentary Rocks Fossils in sedimentary rocks yield clues to the history of life Living Stromatolites in Australia and Cambrian Fossil Stromatolites in New York. Oldest Stromatolites (blue-green bacteria Cyanobacteria) may be as old as 3.5 MY Sedimentary Rocks Important resources (coal, oil) are found in sedimentary rocks Spindletop Oil Well 1901 Beaumont, TX wiki Anthracite Coal geology.com Relationship to Earths Systems Atmosphere Most sediments produced by weathering in air Sand and dust transported by wind Hydrosphere Water is a primary agent in sediment production, Sediment Sediment- loose, solid particles originating from: Weathering and erosion of pre- existing rocks Chemical precipitation from solution, including secretion by organisms in water Sediment Classified by particle size - Wentworth Scale Boulder - >256 mm Cobble - 64 to 256 mm Pebble - 2 to 64 mm Sand - 1/16 to 2 mm Silt - 1/256 to 1/16 mm Clay - <1/256 mm Sediment Transportation Movement of sediment away from its source, typically by water, wind, or ice Rounding of particles occurs due to abrasion during transport Sediment: Rounding Sediment Transportation Sorting occurs as sediment is separated according to grain size by transport agents, especially running water Sediment Transportation Sediment size decreases with increased transport distance Sediment: Transportation River sediment size decreases farther from the source: Headwaters: Gravel, Boulder, Cobble, Pebble Flood Plain : Sand River Mouth : Silt & Clay Deposition Settling and coming to rest of transported material Accumulation of chemical or organic sediments, typically in water Environment of deposition is the location in...
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7._Sediments___Sedimentary_Rocks_white - Sediments...

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