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Exploring Plate Tectonics: Convergent Boundary Collisions

Delve into the dynamics of plate collisions at different convergent boundaries, from subduction to volcanic arcs, mountain ranges to island formations! Learn about the Andes, Cascades, Aluetian Islands, and more.

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Exploring Plate Tectonics: Convergent Boundary Collisions

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  1. Plate Tectonics – Part 2 Types of Convergent Boundaries PLATE COLLISIONS!!!!

  2. Oceanic – Continental Convergence • 1. Collision!!! • 2. Continental Crust is less dense so Oceanic crust sinks (subducts) into the asthenosphere.

  3. Oceanic – Continental Convergence • 3. Subducting Ocean Plate creates a V-shaped Trench. • 4. Oceanic Plate reaches the asthenosphere and melts.

  4. Oceanic – Continental Convergence • 5. The melted magma begins to rise through the mantle and crust. • 6. It will rise to make a volcanic eruption. • 7. Lava cools forming a continental volcanic arc.

  5. Andes Volcanic Mountains (South America) Cascades Mountain Range (Mt. St. Helens) Oceanic – Continental Examples

  6. Oceanic – Oceanic Boundary • 1. Collision!!! • 2. The more dense ocean plate (older) subducts into the asthenosphere.

  7. Oceanic – Oceanic Boundary • 3. Oceanic crust melts into magma. • 4. Magma becomes buoyant and rises. • 5. This eventually forms volcanic islands in the water.

  8. Example of Oceanic-Oceanic Boundaries ALUETIAN ISLANDS

  9. Example of Oceanic-Oceanic Boundaries Northern Mariana Islands

  10. Continental – Continental Boundary • 1. Collision!!! • 2. Neither plate subducts because they are both low in density.

  11. Continental – Continental Boundary • 3. Crust is compressed and deformed, forced upward forming a mountain range.

  12. Example: Continental- Continental Convergence • Mt. Everest! (Himalayan Mts.)

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