Fault Slickensides - Alaska

The host rock here is massive serpentinite from the Kenai peninsula of Alaska and this is a well developed small fault surface. You should note and trace: 1) the linear and fibrous serpentine that forms the slickensides, 2) the steps that the fibers terminate against that consistently step down in one direction, and 3) the subtle corrugations (like corrugated tin roof) in the slip surface.

Questions that may arise are as follows. Which direction did the overlying block (now removed) move relative to this underlying block. What is the mechanical significance of the large corrugations? Was slip on this surface likely associated with seismic events?

Link to interpreted image.

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