title of the thesis - Department of Geology - Queen's University

2.3.11 Late-Stage Fractures
The youngest features in Creighton Mine are late-stage fractures (Cochrane, 1991). These
fractures crosscut steeper-dipping foliation and fault fabrics, postdating shear zone formation.
Subhorizontal shear fractures (apparent orientation in face) and fractures filled with quartzcarbonate
material show evidence of small centimetre-scale displacement. Slickenlines are
observed along fractures found between the 402 and Return Air Raise Shear Zones on the 7810
Level, though direction of motion cannot be discerned. Reverse offset was noted along filled
fractures in this location (Fig. 2.14A, B). Displacement along shallow fractures, such as those
shown in Figures 2.14C and D, are observed in many locations throughout the mine. Sense of
displacement can not always be discerned (Fig. 2.14D).
Figure 2.14: Shallow shear fractures in Creighton Deep. (A) Secondary fractures and displacement occur
oblique to shear zone foliation; (B) oblique relationships are shown in sketch of photograph in A; (C)
shallow-dipping fractures truncate veins; (D) feature orientations are depicted in a sketch of photograph in
C. Direction of displacement is unknown.
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