GEOL101 LAB 7

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San Diego State University *

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101

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Geology

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Feb 20, 2024

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GEOL101 Dynamics of the Earth – Fall 2023 Name: Lily Razzano Laboratory 7: Rock Deformation Section: 03 1. By examining the dip directions on the strike and dip symbols, which direction is the north limb (upper half) dipping: north, south, east, or west? Based on the strike and dip symbols, the north limb ( upper half ) is dipping north and the south limb ( lower half ) is dipping south. 2. By examining the dip directions on the strike and dip symbols, which direction is the south limb (lower half) dipping: north, south, east, or west? The south limb ( lower half ) is dipping south. 3. Based on your answers to Questions 1 and 2 what type of fold is this, syncline or anticline? Anticline because the dip direction is away from each other. 4. Would the limbs on this fold form a topographic high or a topographic low? The limbs of this fold form a topographic high because the figure indicates an anticline. A fold found in the central portion of Iran is shown to the right. Use this screenshot from Google Earth to answer Questions 5 to 8. The fold axis is depicted by the black line, and some strikes and dips on both limbs of the fold are included. Note that North is up in this image! 5. By examining the dip directions on the strike and dip symbols, which direction is the west limb (left half) dipping: north, south, east, or west? The west limb (left half) dips towards the west. 6. By examining the dip directions on the strike and dip symbols, which direction is the east limb (right half) dipping: north, south, east, or west? Refer to Figures 3C and 4C for examples. The east limb (right half) dips towards the east. 7. Based on your answers to Questions 1 and 2, what type of fold is this, a syncline or anticline? Based on the above observation, it's a syncline. As both limbs dip towards each other. 8. Would the limbs on this fold form a topographic high or a topographic low? The limbs of the fold form a topographic low as the limbs dip towards the center.
9. How many anticlines are in Figure 5? There are 4 anticines in figure 5. 10. How many synclines are in Figure 5? There are 3 synclines in figure 5. 11. Based on the fold pattern you observe in Figure 5 what type of fold would you hypothesize to be located to the north of fold G? And similarly, to the south of fold A? Based on the fold pattern, there should be a syncline to the north of fold G and another syncline to the south of fold A. 12. Line D-E is drawn perpendicular (at a right angle) to the folds present in Figure 5. Starting at D and moving towards E, choose the pattern below that matches the fold sequence:. A. syncline, anticline, syncline, anticline, syncline, anticline, syncline B. anticline, anticline, syncline, syncline, anticline, anticline, syncline C. anticline, syncline, anticline, syncline, anticline, syncline, anticline D. syncline, syncline, anticline, anticline, syncline, syncline, anticline 13. Examine the outcrop in Figure 7 above and locate the fault. If you drew a line along the faulty surface, which two letters would this line most likely intersect? Letters J & D 14. In Figure 7, which side of the fault is the hanging wall block: Left or right? Right, the right side of the fault is the hanging wall block 15. Did the hanging wall block in Figure 7 move up or down relative to the foot wall? Moving up the wall 16. What type of fault is depicted in Figure 7? The given figure depicts a reverse fault figure. 17. Based on your answer to Question 15, did this fault form under compression or extension? Compression 17. Examine the outcrop in Figure 8 above and locate the fault. If you drew a line along the fault’s surface, which two letters would this line most likely intersect?
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