Reference no: EM133208145 , Length: Word count: 3 Pages
Assignment Part I: Geologic Cross Sections
Questions partially adapted from Laboratory Manual for Physical Geology, 6th ed by Norris W. Jones and Charles E. Jones
Q1. Along a vertical railroad cut a bed has an apparent dip of 20?, 298?. The bed strikes 067?. What is the true dip of the bed?
Q2. In a mine, a fault has an apparent dip of 14?, N90?W in one adit and 25?, S11?E in another. What is the attitude of the fault plane?
Q3. A fault strikes due north and dips 70?E. A limestone bed with an attitude of 145?, 25?SW is cut by the fault. Hydrothermal alteration along the fault has resulted in an ore shoot at the intersection of the two planes.
a) What is the orientation of the ore shoot?
b) What is the pitch of the ore shoot in the plane of the fault?
c) What is the pitch of the ore shoot in the plane of the limestone bed?
Q4. One limb of a fold has an attitude of 061?, 48?SE and other limb 208?, 55?NW. What is the orientation of the fold axis?
Q5. You are mapping metamorphic rocks and you notice a lineation within the rocks. At five different outcrops you measure the pitch of the lineation on an exposed planar rock surface (not necessarily the same structural surface at each outcrop). The table below lists the attitude of each exposed surface and the pitch of the lineationon that surface.
| Outcrop Number |
Attitude of Surface |
Pitch of Lineation |
| 1 |
300?, 84?NE |
76?E |
| 2 |
350?, 30?E |
50?N |
| 3 |
040?, 70?SE |
63?SW |
| 4 |
157?, 30?W |
50?S |
| 5 |
272?, 45?N |
59?E |
You hypothesize that this lineation represents a planar fabric within the rock. Test this idea by determining whether these five lineation orientations are coplanar. If so, what is the attitude of the plane?
Q6. Two intersecting fault zones have the following attitudes: N80°E, 75°S and S60°W, 52°NW.
a) What is the orientation of the line of intersection?
b) What is the orientation of the plane perpendicular to the line of intersection?
c) What is the obtuse angle between the shear zones within this plane?
d) What is the orientation of the plane that bisects the obtuse angle?
e) A mining adit is to be driven to the line of intersection of the two fault zones. For maximum stability the adit is to bisect the obtuse angle between the two fault zones and intersect the line of intersection perpendicularly. What should the trend and plunge of the adit be?
Assignment Part II: Two Tilt Problems
Q7. The beds below an angular unconformity have an attitude of 334°, 74°W, and those above 030°E, 54°NW. What was the attitude of the older beds while the younger beds were being deposited?
Q8. Iron-bearing minerals in volcanic rocks contain magnetic fields that were acquired when the magma flowed out onto the earth's surface and cooled. These magnetic fields can be measured to determine the orientation of the lines of force of the earth's magnetic field at the time of cooling. If the north-seeking paleomagnetic attitude in a basalt is 32°, N67°E, and the flow has been tilted to S12°E, 40°W, what was the attitude (plunge and trend) of the pretilt paleomagnetic orientation?
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