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Rider Structural Geology 310 2012 GCHERMAN

Faults. Some exercises adapted from Lisle, R. J., 2004, Geological Structures and Maps, Practical Guide, Third edition. http://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htm. Rider Structural Geology 310 2012 GCHERMAN. Faults.

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Rider Structural Geology 310 2012 GCHERMAN

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  1. Faults Some exercises adapted from Lisle, R. J., 2004, Geological Structures and Maps, Practical Guide, Third edition http://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htm Rider Structural Geology 310 2012 GCHERMAN

  2. Faults From Simple inclined planes: Spacing between contours = contour interval / tangent (angle of dip) Rider Structural Geology 310 2012 GCHERMAN

  3. Dip separation is the bed offset in the down dip direction of the fault (Fig. 4.7). The vertical component of the dip separation is called the throw and its horizontal component is the heave; both of these quantities can be seen in a plane perpendicular to the fault’s strike. For a given fault, the ratio of the heave to the throw depends on the fault plane’s dip in this manner: tan (dip of fault) = throw/heave (Fig. 4.7) d 0.7 90-d 1.8 tan (90-d) = heave/throw and tan d = throw/heave tan 20 ~ 0.7/1.8 = 0.36 tan 70 ~ 1.8/0.7 = 2.70 Rider Structural Geology 310 2012 GCHERMAN

  4. Rider Structural Geology 310 2012 GCHERMAN

  5. ~17m Rider Structural Geology 310 2012 GCHERMAN

  6. The vertical separation is determined by selecting any point on the map and calculating the height difference of the two displaced parts of a geological surface. For example at point x (Fig. 4.9B), height of mudstone bed in hanging wall = –10m height of mudstone bed in foot wall = –20m height difference = (–10) – (–20) = 10 m = vertical separation the stratigraphic separation = vertical separation x cos (fault dip) = 10m 0.64 = 6.4 m. From Section 43., page 61: The stratigraphic separation is the shortest distance between two parallel planes, or the distance measured in a direction which is perpendicular to these planes. Rider Structural Geology 310 2012 GCHERMAN

  7. Use the PowerPoint object tools to rotate the red line, and investigate the omission and repetition results Rider Structural Geology 310 2012 GCHERMAN

  8. Rider Structural Geology 310 2012 GCHERMAN

  9. Fault strike / dip = 087 / 18 N (TAN dip = 100 m / 300 m ) Bedding strike / dip = 050 / 9 N (TAN dip = 100 m / 600 m ) 40o DA deviation Apparent dip ~ 7o Rider Structural Geology 310 2012 GCHERMAN

  10. 800 600 Rider Structural Geology 310 2012 GCHERMAN

  11. 200 100 X Y 26o profile dip with aplha (dip-azimuth deviaiton) ~24o Apparent dip of ?? 800 600 Rider Structural Geology 310 2012 GCHERMAN

  12. X Decapitation thrust fault Y 800 600 Rider Structural Geology 310 2012 GCHERMAN

  13. X Y DS 800 T VS 600 H Rider Structural Geology 310 2012 GCHERMAN

  14. STATION 76250   031/76S cut by 174/68 E w apparent left lateral offset Rider Structural Geology 310 2012 GCHERMAN

  15. MAP Rider Structural Geology 310 2012 GCHERMAN

  16. PROFILE W E

  17. HOMEWORK 0 -10 Rider Structural Geology 310 2012 GCHERMAN

  18. STATION   LAT       LON  76250     40.32721  -74.91455 76251     40.32744  -74.91411 76252     40.32836  -74.91278 76253     40.32912  -74.91173 Rider Structural Geology 310 2012 GCHERMAN

  19. http://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htmhttp://www.impacttectonics.org/gcherman/downloads/GEO310/GCH_GESymbols/GCH_GE_Geology_Apps.htm Rider Structural Geology 310 2012 GCHERMAN

  20. Rider Structural Geology 310 2012 GCHERMAN

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  25. 70 50 Rider Structural Geology 310 2012 GCHERMAN

  26. Rider Structural Geology 310 2012 GCHERMAN

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