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 . 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

lineation Feasible? Explanation type of motion indicated

A) 34 due north yes The Dip angle is due NE and the Dip Slip motion

trend of recorded plunge is going

same direction so feasible

B) 0, 140 yes The Dip angle is due NE and the Strike Slip motion

trend of recorded plunge is going

same direction so feasible

C) 33,N66W NO The dip Angle is due NE and the given obligue slip motion

recorded numbers are indicating towards

west so not feasible

D) 47, 050 NO The dip Angle is due NE and the given obligue slip motion

recorded numbers are indicating towards

west so not feasible

E) 75, due north NO The dip Angle is due NE and the given obligue slip motion

recorded numbers are indicating towards

North so not feasible

  

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