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Geological significance of fracture traces


, : Geological significance of fracture traces. Photogrammetric Engineering and Remote Sensing 27(3): 435-438

Fracture traces, as now mapped in a variety of landscapes, are parallel or subparallel to joints in areas of flat or very gently folded rocks but are not parallel to the dominant joint sets in folded rocks. They apparently extend downward to depths of at least 3,000 ft. at Bisbee, Arizona, where ore pods, which are fracture-controlled, are parallel to surface fracture traces. A probable wrench fault in Alaska separates 2 areas of different fracture-trace orientations, but fracture-trace orientations are identical on both sides of a thrust fault in central Pennsylvania. Extrusive and intrusive igneous rocks in the same area of Alaska show different fracture-trace orientation.

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Other references

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