09 GEOS 1004 - GEOS 1004, SPOTILA Lecture 6, 9/14/09...

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Lecture 6, 9/14/09 SEDIMENTARY ROCKS Why are they important to study? STEP 1: weathering physical weathering - mechanical breakdown into particles of rock; clastic sediment -examples of causes? chemical weathering - chemical breakdown into loose ions; chemical sediment (ions) -by products of chemical weathering reactions = clay minerals (help make up soil) ions-transported by water to oceans clay minerals- residue, makes up soil STEP 2: erosion: clastic or chemical sediment transport Pick up and transport, by gravity, water (most common), ice, or wind. Erosion is both chemical and physical STEP 3: deposition: into layers; clastic sediment by gravity (settling), chemical sediment by chemical reactions sedimentary layers= stratigraphy I. Clastic sediment Clastic sediment is classified by size: boulders, cobbles, pebbles ---> become conglomerate sand ---> become sandstone silt ----> become siltstone mud, clay ----> become shale What happens as clastic sediment is transported? 1) more weathering (abrasion)
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09 GEOS 1004 - GEOS 1004, SPOTILA Lecture 6, 9/14/09...

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