Slideshow 101.12 Sedimentary Rocks - Weathering

Slideshow 101.12 Sedimentary Rocks - Weathering -...

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Unformatted text preview: Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Sedimentar y Rocks Overview Weathering Soil Classification of Sedimentary Rocks Sedimentary Structures Sedimentary Environments Sedimentary Basins Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Sedimentary Rock is formed from Sediment Sediment is Unconsolidated Fragments of: • mineral grains, rock pieces, shell fragments precipitated crystals • includes materials like sand, mud and gravel Sedimentary Rocks form by: 1) Cementing together of clasts 2) Growth of shells by organisms 3) Precipitation of minerals directly from a solution Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments … Weather ing is the process by which rocks and minerals break down at or near the Earth’s surface Er osion : the process by which moving water, wind, ice, or gravity carries pieces of weathered rock away from the bedrock and deposits them somewhere else Weather ing Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Weather ing breaks down rocks and minerals and Er osion transports the weathered fragments away. Together they create Sediment- the raw material for sedimentary rocks. Sediment: unconsolidated particles created by the weathering and erosion of rock, precipitated from water, or secretions of organisms. Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Two Types of Weather ing: Mechanical Weather ing Chemical Weather ing Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Mechanical Weather ing: breaks a mineral or rock into smaller pieces without changing their chemical makeup. Creates more surface area. Sedimentar y Rocks and Envir onments Sedimentar y Rocks and Envir onments Mechanical weather ing pr ocesses 1. Fr ost wedging 2. Cr ystal gr owth 3. Ther mal Expansion & Contr action 4. Exfoliation 5. Biological 6. Abr asion Sedimentar y Rocks and Envir onments...
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This note was uploaded on 04/11/2008 for the course GEOL 101 taught by Professor Winstonnorrish during the Fall '07 term at Central Washington University.

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Slideshow 101.12 Sedimentary Rocks - Weathering -...

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