geology 101 study guide

geology 101 study guide - Chapter 11 Folds, Faults, and...

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Chapter 11 Folds, Faults, and Other Records of Rock Deformation How do Rocks Become Deformed? What determines whether a Rock Bends or Breaks? Ductile rocks bend or fold Brittle rocks break or fault Folds and faults are commonly referred to as geologic structures. Folds Folds are structural features (different than hills, which may be only from erosion). Folds form when rocks undergo Ductile (plastic) deformation from compression. At what type of plate boundaries would you expect them to form? Types of Fault s Dip-Slip Motion is vertical (up and down) along the fault
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Generated by compressional (shortening) or tensional (extension) forces. Strike-Slip Motion is horizontal (side by side) along the fault plane. Generated by shearing forces. Normal or Reverse Fault? The easiest way to determine the type of vertical motion is to see a cross-section (side view). Based on relative motion. MAKE SURE THERE IS A MARKER BED Strike-slip Fault The easiest way to determine the direction of horizontal motion is to see a map view. Based on relative motion. All faults are an expression of brittle strain, but they result from different types of stress. Tectonic stress leads to strain
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geology 101 study guide - Chapter 11 Folds, Faults, and...

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