“Classic” plate tectonic settings and mountain building Divergent boundary – fault-block mountains (horsts and grabens)

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“Classic” plate tectonic settings and mountain building Divergent boundary – fault-block mountains (horsts and grabens)

Steens Mountain, Oregon

“Classic” plate tectonic settings and mountain building Divergent boundary – fault-block mountains (horsts and grabens) Collision (convergent) boundary – “fold-and- thrust” belts

Development of a fold and thrust belt mountain range Note the asymmetry as one part of the fold overrides the other part. The low- angle reverse fault is called a thrust fault.

Wyoming foreland – Rockies

“Classic” plate tectonic settings and mountain building Divergent boundary – fault-block mountains (horsts and grabens) Collision (convergent) boundary – “fold-and- thrust” belts Subduction (convergent) boundary – volcanic arc mountains

Cascades volcanic arc

“Classic” plate tectonic settings and mountain building Divergent boundary – fault-block mountains (horsts and grabens) Collision (convergent) boundary – “fold-and- thrust” belts Subduction (convergent) boundary – volcanic arc mountains Transform boundaries are not associated with mountain-building

Origin of the Transverse Ranges “Transpressional”

Origin of the Sierra Nevada Relict subduction zone