GLG 201 4.4.07 - 5. Relationship between deformation and...

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GLG 201 4.4.07 Why do some rocks break and other change shape? Deformation behavior depends on: 1. Composition; what is rock made of? a. Some minerals are harder than others b. Same conditions: i. Granite (lots of quartz) 2. Bending 3. Pressure a. Rocks above are confining pressure i. Keeps rocks from breaking b. Mostly ductile deformation will occur at depths at 10-15 km below surface if temperature is also high c. White/dark gneiss i. White: quartz ii. may show FLOW structures related to ductile deformation 4. Temperature a. Warm rocks are DUCTILE (they bend) b. Cold rocks are BRITTLE (they break)
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Unformatted text preview: 5. Relationship between deformation and earthquakes a. Earthquakes ONLY occur whenever rock deforms BRITTLELY! i. Earthquakes are the release of energy inside the Earth ii. Often result of BRITTLE deformation Stress Stress is the force/area that causes deformation Three types of stress 1. Compression a. Folds b. Faults: reverse or thrust 2. Tension/extension a. Fault: normal 3. Shear a. Fault: Strike-slip Recognizing Faults Faults dont have to break Earths surface...
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GLG 201 4.4.07 - 5. Relationship between deformation and...

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