“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