Lec6 - University of California Berkeley Civil Engineering 70 Professor Ken Johnson Engineering Geology Civil Engineering 70 Lecture 6 Goals o What

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 6 9/13/07 Goals o What sediment is How is it described How is it formed How is it Moved o Sediment Character is linked to environment o Terms – Bed, fissility, dip slopes Sedimentary Rocks o Formed by deposition of sediments Clastic Sedimentary Rocks Clasts – sand, gravel, silt, clay, particles Different sizes of clasts Chemical Sedimentary Rocks By precipitation from a saturated solution Biogenic Sedimentary Rocks By deposition of skeletal remains of marine or lacustrine organisms o Sedimentary part of Rock Cycle Wethering Erosion and dissolution Transportation Deposition Burial Diagenesis o Terms of clastic Sedimentary rocks Conglomerate - >50% gravel size Sandstone - >50% sand size Siltstone - >50% silt size Shale - >50% clay size, has fissility Claystone - >50% clay size, has no fissility Mudstone - >50% clay size, has no fissility Fissility – plane of weakness in compressed sedimentary rocks Composed of clasts and matrix Matrix consists of finer grained particles and cementing material Lithification of Sedimentary Rocks o Consolidation Slow squeezing of water from the pore space o Compaction Rearrangement of particles/clasts
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This note was uploaded on 04/02/2008 for the course CE 70 taught by Professor Johnson during the Fall '07 term at University of California, Berkeley.

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Lec6 - University of California Berkeley Civil Engineering 70 Professor Ken Johnson Engineering Geology Civil Engineering 70 Lecture 6 Goals o What

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