Download Appalachian Mountain Building

Chapter 20 Section 2
Lauren Bauschard
Jamie Reed
Orogeny is the process that for all mountain
ranges.
 Orogeny results in broad, linear regions of
deformation known as orogenic belts.
 Most orogenic belts are associated with plate
boundaries.
 The greatest variety and
the tallest of these belts
Are found at convergent
Boundaries.
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When an oceanic plate converges with another oceanic plate,
one plate descends into the mantle to create a subduction
zone.
As parts of the subducted plate melt, magma is forced
upward to form a series of volcanic peaks called an island arc
complex.
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Same as O-O boundaries in that convergence along
both creates subduction zones and trenches.
Convergence between O-C plates can produce
major mountain belts
The descending oceanic plate forces the edge of
the continental plate upwards. This uplift marks
the beginning of orogeny.
In addition to uplift, compressive forces may cause
the continental crust to fold and thicken.