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Earth science 11.3
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Earth science 11.3

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Transcript

  • 1. 11.3 Mountain Formation
  • 2. Accretionary wedge
    • A large wedge-shaped mass of sediment that accumulates in subduction zones; Here sediment is scraped from the subducting oceanic plate and accreted to the overriding crustal block
  • 3. accretion
    • Process that occurs when crustal fragments collide with and stay connected to a continental plate.
  • 4. terrane
    • A crustal block bounded by faults, whose geologic history is distinct from the histories of adjoining crustal blocks
  • 5. Isostacy
    • The concept that earth’s crust is floating in gravitational balance upon the material of the mantle
  • 6. Isostatic adjustment
    • Process of establishing a new level of gravitational equilibrium
  • 7. Key Concept
    • Most mountain building occurs at convergent plate boundaries. Colliding plates provide the compressional forces that fold, fault, and metamorphose the thick layers of sediments deposited at the edges of landmasses.
  • 8. Key Concept
    • Ocean- ocean convergence mainly produces volcanic mountains.
  • 9. Key Concept
    • The types of mountains formed by ocean-p continental convergence are volcanic mountains and folded mountains.
  • 10. Key Concept
    • At a convergent boundary between two plates carrying continental crust, a collision between the continental fragments will result and form folded mountains.
  • 11. Key concept
    • The mountains that form along ocean ridges at divergent plate boundaries are fault- block type mountains.
  • 12. Key concept
    • Because of isostasy, deformed and thickened crust will undergo regional uplift both during mountain building and for a long period afterward.