Fault surfaces sometimes contain overprinted slip lineations (fault striae). Suc

Question

Fault surfaces sometimes contain overprinted slip lineations (fault striae). Such slip lineations can be used to determine the orientation of slip on a fault, and, therefore, whether the motion on the fault was strike-slip, dip-slip, or oblique-slip. A geology student who was just learning to use a Brunton compass recorded the orientations of five slip lineations on one fault surface. The strike and dip of the fault surface is 320 degree, 47 degree NE. The student's five recorded lineation orientations are recorded in the table below. Determine which lineation orientations are feasible and which ones must represent a mistake on the part of the student because the given orientation does not lie within the fault plane. Give a brief explanation for each of your five answers. For the valid lineation orientations, indicate which type of fault motion is indicated.

Explanation / Answer

a) yes, fissible. As the lineation plunge is lesser than bed dip angle and direction is towards due north so it is fissible.Type of motion is oblique slip.

b) Yes, fissible. As it is towards strike of fault. It is strike slip motion.

c) No, not fissible. As it is opposite direction of fault plane.

d)Yes, fissible. It is towards dip of the fault plane. it is dip slip motion.

e) No, not fissible. As it is larger than dip of the bed. a lineation pluge always lower than fault plane dip angle.

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