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Appalachian Mountain Building

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Orogeny is the process that for all mountain ranges. Orogeny results in broad, linear regions of deformation ... This uplift marks the beginning of orogeny. ... – PowerPoint PPT presentation

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Title: Appalachian Mountain Building


1
Appalachian Mountain Building
  • Chapter 20 Section 2
  • Lauren Bauschard
  • Jamie Reed

2
Orogeny
  • 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.

3
Oceanic-Oceanic Convergence
  • 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.

4
Oceanic- Continental Convergence
  • 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.

5
Oceanic-Continental Convergence
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