Question

describe the plate tectonic conditions that led to the formation of the sierran arc and the sevier fold-thrust belt.

Answer 1

A convergent-plate boundary to the west of North America caused oceanic crust to be subducted, causing collisions with microcontinents and the partial melting of oceanic crust to create the Sierran volcanic arc.

Give an explanation of the plate tectonic conditions that led to the formation of the Sevier thrust belt and the Sierran arc. During the Laramide orogeny, what happened?

A convergent-plate boundary to the west of North America caused oceanic crust to be subducted, which led to collisions with microcontinents and the partial melting of oceanic crust that produced the Sierran volcanic arc. Compression was responsible for the arc's folds and thrust faults. As opposed to earlier orogenies that just established the more superficial faults of the fold-thrust belts behind the arc, faulting associated with the Laramide orogeny was responsible for the creation of the Rocky Mountains. The Sevier-style orogeny may have changed as a result of the subducting slab's shallowing dip.

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