Abstract

Structural, petrologic, and geochemical data support the correlation of the Redwood Creek schist of northwesternmost California with the South Fork Mountain Schist of northern California and the Colebrooke Schist of southwestern Oregon. Metamorphism to lawsonite-albite-chlorite facies and development of secondary structures recording two penetrative deformations are shared by all three units. A later deformational event recorded by the Redwood Creek schist, but absent in the South Fork Mountain Schist, consists of differential rotation of domains several kilometres in size within the schist belt. This deformation is significant, because it records an event that occurred after the separation of the schist bodies. The rotation most probably occurred in conjunction with northward strike-slip movement of the Redwood Creek schist.

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