Abstract

The Omineca crystalline belt of northeastern Washington and southeastern British Columbia is characterized by a regional Bouguer gravity high, and individual gneiss domes within the terrane are marked by local gravity highs. Models of crustal structure which satisfy the limited available seismic refraction data and explain the gravity highs over the gneiss terrane permit the hypothesis that the metamorphic core complexes are the surface expression of a zone of dense infrastructure that makes up the top 20 km of the crust within the crystalline belt.

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