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Kapuskasing Structural Zone - Regional Summary

The Kapuskasing uplift is an enigmatic northeast trending belt of high-grade metamorphosed rocks that cuts obliquely across the dominant east-west trending lower grade lithologic belts of the southern Archean Superior Province, the central core of the North American craton. It is shown to be an intact, west-dipping, 20km thick crustal, soled by an intracrustal decollement above which 55-70 km of southeastward directed thrusting brought mid-to-lower crustal rocks to the surface. The upper crustal deformation was accompanied by the development of a lower crustal root, up to 200 km wide and 12 km thick. The shortening was accomplished by brittle faulting and erosion at levels above 20 km and ductile folding or faulting in the lower crust. A complex, multi-stage history is inferred:

  1. an ~2540 Ma event with a large component of east-west shortening and ~10 km of thrust uplift;
  2. an ~1900 Ma dextral transcurrent event associated with an additional ~10 km of uplift.

LITHOPROBE studies have documented the KSZ as being a "window" on the mid-to-lower crust - an exposed crustal laboratory from which new insights on the development of cratonic crust have already been derived.

Synthesis volume: Canadian Journal of Earth Science, V31, #7, July, 1994

Kapuskasing Publications

Kapuskasing Transect Reports

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