Tectonics of the Seiad massif, northern Klamath Mountains, California
Structural data and analyses of mineral preferred orientations in the Seiad massif of northern California give evidence for the distinction of two ultramafic assemblages with different oceanic histories. The contact between these two assemblages is a thrust fault. Before the thrusting, the underthrust peridotite was deformed in lithospheric conditions, together with an amphibolite unit not