chapter_06_lec modified

chapter_06_lec modified - Sediment and Sedimentary Rocks...

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Steve Kadel, Glendale Community College Sediment and Sedimentary Rocks Physical Geology 11/e, Chapter 6
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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 Sedimentary rock types and sedimentary structures within the rocks give clues to past environments Fossils in sedimentary rocks give clues to the history of life Important resources (coal, oil) are found in sedimentary rocks
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Relationship to Earth’s Systems Atmosphere Most sediments produced by weathering in air Sand and dust transported by wind Hydrosphere Water is a primary agent in sediment production, transportation, deposition, cementation, and formation of sedimentary rocks Biosphere Biological activity key to formation of sedimentary rocks Petroleum and coal resources have biological origin
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Sediment Sediment - loose, solid particles originating from: Weathering and erosion of pre-existing rocks Chemical precipitation from solution, including secretion by organisms in water Classified by particle size 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 Gravel
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From Sediment to Sedimentary Rock Transportation Movement of sediment away from its source, typically by water, wind, or ice Rounding of particles occurs due to abrasion during transport
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chapter_06_lec modified - Sediment and Sedimentary Rocks...

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