Frost wedge with associated normal faulting of enclosed sediment
Location: Northwest Arm of Kaminak Lake, Kivalliq, Nunavut, Canada; NTS 55L Kaminak Lake; 62° 17.5' N, 95° 31' W
This frost wedge has the same general history and configuration as that described in 0211 and is probably the one shown in close-up in 0064. However, in this image, the enclosing sediment can be seen to be disrupted by normal faults at the left side of the wedge. Infill predating the section's reactivation, described in the caption for image 0064, seems to have been displaced by the faulting. Since normal faults imply extension, it is possible that the enclosing sediment has been disrupted as a result of shrinking of the physical dimensions of the wedge. The faulting seems to extend to the surface on which the recent eolian sediments have been deposited. The beds at the right side of the wedge seem to be upturned as they would be by compression. A tuna fish can is in the lower left part of the image for scale.
Updated 04/09/2010 AW