weathering%20powerpoint

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Unformatted text preview: Questions to start 1. What are sedimentary rocks? 2. What kinds do you know? 3. Where do sedimentary rocks come from? Terrigenous or siliciclastic sedimentary rocks conglomerate sandstone Dark Grey Shale with Sandstone on Top Fountain Fm Chemical/biochemical sedimentary rocks Rock formed by the precipitation of minerals from solution by either organic or inorganic processes Chemical/biochemical sedimentary rocks Limestone Carbonate Chert Silicate Salt, gypsum Evaporites Carbonaceous sedimentary rocks – contain abundant organic matter Salt marsh peat Organic material deposited in saturated conditions with low oxygen content (i.e. stagnant water, swamp) Peat is partially altered plant material – see a sample in lab next week Coal formed by compacting partially decayed organic matter, burial and heating, concentrates H and C Coal mine in Kentucky Relative Abundance of Sedimentary Rocks Initial process to formation of clastic sedimentary rocks? • Start with source rocks that undergo weathering • What is mechanical weathering? • What is chemical weathering? The rock cycle Initial processes to form sedimentary rocks? • Start with source rocks that undergo weathering – • Where are those source rocks probably going to be located? Note where they are located here. • Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition) of rock at Earth’s surface • Erosion – the physical removal of material by mobile agents such as water, wind, ice, or gravity • Transport- movement of sediment and dissolved weathering products Physical and chemical weathering work hand-in-hand PHYSICAL: makes or enlarges cracks for passage of water CHEMICAL: dissolves or alters certain minerals; can enlarge fractures •...
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This note was uploaded on 03/02/2010 for the course GEOL 3430 taught by Professor Kraus during the Spring '10 term at Colorado.

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weathering%20powerpoint - Questions to start 1. What are...

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