Abstract

Finite-strain analyses of Galice Formation metagraywackes from the footwall block of the Orleans fault, western Klamath Mountains, California, show a dramatic increase in strain ratios structurally upward, approaching the Orleans fault. Rxz strain values range from less than 3 at a distance of 2 km from the fault to 6.5 adjacent to the fault. Strain-ellipse orientations are relatively consistent; X-directions are commonly northwest-southeast and subhorizontal and trend subparallel to the trace of the Orleans fault. Finite-strain ellipse orientations and the clockwise rotational strain recorded by microscopic kinematic indicators are both compatible with the interpretation of dextral oblique convergence on the Orleans fault during the Nevadan orogeny.

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