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CONVERGENT BOUNDARIES And Mountains Building

Explore the processes of mountain formation such as folding, thrust faulting, metamorphism, and igneous activity at convergent boundaries. Learn about the Appalachian Mountains, Ural Mountains, and the hypotheses behind Earth's mountain belts.

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CONVERGENT BOUNDARIES And Mountains Building

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  1. CONVERGENT BOUNDARIES And Mountains Building Orogenesis: the processes that produce a mountain belt. It includes: 1. Folding 2. Thrust faulting 3. Metamorphism 4. Igneous activity (Plutons (batholith) and Volcanism)

  2. Appalachian Mountains

  3. Ural Mountains

  4. Several hypotheses have been proposed for the formations of Earth’s mountain belts:

  5. at convergent plates • at Continental Plates Collisions • due to Continental accretion • 4. Fault-block mountains

  6. Convergent boundary of two oceanic plates. Creates an ________ and a _____. Example: _____ island arc trench Japan

  7. Convergent Plate Boundaries • Older portions of oceanic plates are returned to the mantle in these destructive plate margins • Surface expression of the descending plate is an deep ocean trench • Also calledsubduction zones • Average angle of subduction = 45 • 1000’s km long, 8-12km deep, 50-100km wide.

  8. Earthquake depth indicates subduction zones

  9. Subduction of oceanic lithosphere at an ocean trench

  10. Convergent boundary of an oceanic plate and a continental plate. Forms a _______ mountain range and a ______. Examples: _______ or ______ Mts volcanic trench Andes Cascades

  11. Aforearc=forarc =arc-trench gap: adepressionin thesea floorlocated between asubduction zoneand an associatedvolcanic arc. It is typically filled withsedimentsfrom the adjacent landmass and the island arc in addition to trappedoceanic crustalmaterial.

  12. Continental-Continental Convergence

  13. Convergent boundary of two continental plates. Forms a ______ mountain range. Examples: ___________, Alps, ______________ Himalayas folded Appalachians

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