Ch07_As Presented

Ch07_As Presented - Chapter 7 Sedimentary Rocks What is a...

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Chapter 7 Sedimentary Rocks
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What is a sedimentary rock? ± Sedimentary rocks are products of mechanical and chemical weathering ± They account for about 5% (by volume) of Earth’s outer 10 miles ± Contain evidence of past environments Provide information about sediment transport Often contain fossils
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What is a sedimentary rock? ± Sedimentary rocks are important for economic considerations because they may contain Coal Petroleum and natural gas Sources of iron, aluminum, and manganese
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Turning sediment into rock ± Many changes occur to sediment after it is deposited ± Diagenesis = chemical, physical, and biological changes that take place after sediments are deposited Occurs within the upper few kilometers of Earth’s crust
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Turning sediment into rock ± Diagenesis Includes Recrystallization – development of more stable minerals from less stable ones Lithification – sediments are transformed into solid rock by Compaction and cementation Natural cements include calcite, silica, and iron oxide
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Types of sedimentary rocks ± Sediment originates from mechanical and/or chemical weathering ± Rock types are based on the source of the material Detrital rocks – transported sediment as solid particles Chemical rocks – sediment that was once in solution
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This note was uploaded on 07/17/2008 for the course GS 121 taught by Professor Leavell during the Fall '07 term at Ohio State.

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Ch07_As Presented - Chapter 7 Sedimentary Rocks What is a...

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