![]() ![]() The area is cut by a major fault running NE-SW approximately. Map 2 shows an area in which a thick sequence of conglomerate (circles) unconformably overlies mudstone (white) and coal (black). Say whether the strike-slip component is sinistral or dextral.Ģ. Say whether the dip-slip component is normal or reverse. Measure the distance of net slip and determine its trend and plunge from the stereographic projection. Draw a line between the two cutoffs, parallel to the slickenline orientation. Draw a few of the slickenlines, also with their correct rake.Ĭ) *Now mark, using a dashed line, the cutoff of the dyke in the hanging wall (450 m across strike from its position in the footwall). The cutoff-line of the dyke in the footwall should be shown with its correct rake. The land surface should be a horizontal line at the top of the section. This section will show what you would see if you were able to remove the hanging wall block completely, and look directly at the fault face on the footwall. Use a small ‘×’ for the linear data.ī) *Now draw a fault-plane cross-section, viewed from the southwest. Also plot the slickenline lineation, and the intersection line, where the fault and dyke intersect. Determine the slip of the fault.Ī) *Plot the fault and the dyke as great circles on a stereographic projection. Slickenlines on the fault trend toward the south and have rake of 060°. Assignmentġ.* Map 1 shows a simple map of a level landscape 500 m above sea level, in which a fault offsets a mafic dyke with a strike separation of 450 m. In this lab you will analyse areas where piercing points can be located in both the footwall and hanging wall of a fault, allowing the true slip to be determined. This is because cut-offs for a single plane surface are inadequate to determine the displacement vector, or slip of a fault. In Lab 7 you dealt with fault constructions that involved the separation of surfaces, but not with fault slip. ![]()
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