Fold mountain

From Wikipedia, the free encyclopedia
  (Redirected from Fold mountains)
Jump to: navigation, search
Zagros mountain range, seen from space.

Fold mountains are mountains formed mainly by the effects of folding on layers within the upper part of the Earth's crust. In the time before either plate tectonic theory developed, or the internal architecture of thrust belts became well understood, the term was used for most mountain belts, such as the Himalayas. The term is still fairly common in physical geography literature but has otherwise generally fallen out of use except as described below. The forces responsible for formation of the fold mountains are called orogenic movements. The term orogenic has derived from a Greek word meaning mountain building. These forces act at tangent to the surface of the earth and are primarily a result of plate tectonics.

Formation[edit]

Fold mountains are formed when two tectonic plates move together (a convergent plate boundary). Fold mountains are formed from sedimentary rocks which accumulated along the margins of continents. When plates and the continents riding on them collide, the accumulated layers of rock may crumple and fold like a tablecloth that is pushed across a table, particularly if there is a mechanically weak layer such as salt.[1]

Examples[edit]

See also[edit]

References[edit]

  1. ^ a b Ulmer, S. (11 August 2011). "Fold mountains slip on soft areas". ETH Life. ETH Zürich. Retrieved 21 February 2012.