9_Structure_Labs - Structural Geology Determine geologic...

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Structural Geology Determine geologic history using: Faunal Succession Cross-Cutting Relationships Original Horizontality Superposition Deformation Faults (fracture with offsetting motion) Folding Unconformity (buried surface of erosion)
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Faults
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Unconformity
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Folds
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Strike and Dip: measurements geologists take to understand ORIENTATION of rocks in space Is the rock tilted? By how much?
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Strike and Dip of a Planar Feature Strike: compass direction of a line formed by the intersection of a dipping plane (a stratum or fault) and a horizontal plane N-S strike E-W strike N30° E Dip: measured at a right angle to the strike (true dip). The amount of dip is the angle between the dipping plane and a horizontal plane. 20° 65°
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Structures Related to Stress Type Stress (force per unit area) causes strain (deformation) Tensional stress: pulling apart, extension, stretching Normal fault, rift Compressional stress: pressing together Fold, reverse fault, thrust fault (reverse fault with low- angle fault plane) Shear stress: tangential Strike-slip fault Vertically directed stress: Stress up or down
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This note was uploaded on 03/06/2011 for the course GEO 301 taught by Professor Long during the Fall '07 term at University of Texas at Austin.

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9_Structure_Labs - Structural Geology Determine geologic...

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