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The Skiag Bridge backthrust fault in Pipe Rock Quartzite. The zig-zag line highlights a single sedimentary layer from which many samples were collected. Note the damage extends in to both the hanging and foot walls. The poles are 1m in length. |
The photographs below are progressively more detailed illustrations of the Skiag Bridge back thrust fault developed in Cambrian Pipe Rock Quartzite at Loch Assynt, NW Scotland. The fault has a displacement of ~1m accommodated on an ~30cm wide displacement zone. However, deformation extends for considerable distance (~6m and ~4m respectively) into both the hanging and foot wall rocks. The fault zone has been extensively sampled and the fault rocks have been studied via a variety of techniques, including optical, cathodoluminescence, SEM, EBSD and TEM microscopy, to arrive at a model based on grain indentation.
For further details, see the original micrographs and descriptions in: Lloyd and Knipe. 1991, Journal of Structural Geology, and Knipe and Lloyd, 1994, Pure and Applied Geophysics.
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The Skiag Bridge backthrust fault in Pipe Rock Quartzite. The zig-zag line highlights a single sedimentary layer from which many samples were collected. Note the damage extends in to both the hanging and foot walls. The poles are 1m in length. |
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Detaile of the region adjacent to the main displacement plane. Note the 'foliated' appearance of the fault rock. |
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The main fault displacemnent plane: not fault blocks and fine scale gouge. |
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Individual fault blocks and gouge. |
