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10.3 Plate Tectonics

10.3 Plate Tectonics . By: Brendan, Sid, and Andy. Video . http://www.youtube.com/watch?v=mnPNNr5aE7I. Volcanoes. There are 800 volcanoes worldwide that are un-identified The main group of volcanoes are around the “Ring of Fire” near the pacific boundary

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10.3 Plate Tectonics

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  1. 10.3 Plate Tectonics By: Brendan, Sid, and Andy

  2. Video http://www.youtube.com/watch?v=mnPNNr5aE7I

  3. Volcanoes There are 800 volcanoes worldwide that are un-identified The main group of volcanoes are around the “Ring of Fire” near the pacific boundary Another group is Intraplate Volcanism-based off of how hot the mantle below it is

  4. PewPew

  5. Intraplate Volcanism Intraplate Volcanism is when volcano processes happen in planes and not on the edge of boundaries. The most widely know one is/is in Hawaii They’re mantle plumes in the lower mantle that rise due to convection. They come up from a massed area, called a plume head, and go through a long neck like vent called a plume tail

  6. Mantle PLumes Mantle plumes appear to form deep within Earth at the core-mantle boundary. Once the plume nears the top of the mantle, decompression melting forms basaltic magma. Hot spots are the result of this which are small volcanic regions a few hundred kilometers across

  7. Intraplate

  8. Hawaii Hawaii lies above the mantle plume. The plume and all the volcanoes are currently active The seven islands are becoming normal like volcanoes The main phase of volcanoes ended on Oahu 3 million years ago On Kauai it ended 5 million years ago The magma that hardens forms the islands that are there today.

  9. Convergent Plate Boundaries The basic connection between plate tectonics and volcanism is that plate motions provide the mechanisms by which mantle rocks melt to generate magma. Here, slabs of oceanic crust are pushed down into the mantle. As a slab sinks deeper into the mantle, the increase in temperature and pressure drives water from the oceanic crust.

  10. O-C When an Ocean boundary is converging with a Continental boundary the ocean will go under and have volcanoes forming what looks like a arc. The difference from these arcs and ocean arcs would be the magma that is formed The magma would have more silica content making it’s viscosity lower

  11. O-C

  12. O-O When the two oceanic boundaries converge they will form volcanoes at the ocean floor that will eventually rise up to form normal volcano arcs on the surface of the water.

  13. O-O

  14. CP Boundaries cont.

  15. Divergent There is much more magma in divergent boundaries due to the fact that the pressure is so much less than the others and the immense amounts of magma will just flow to the area.

  16. Divergent Plate Boundaries Most magma is produced along the oceanic ridges during seafloor spreading. Below the ridge axis where the plates are being pulled apart, the solid yet mobile mantle rises upward to fill in the rift where the plates have separated. The rock undergoes decompression melting, producing large amounts of magma. This newly formed basaltic magma is less dense than the mantle rock from which it was formed, so it buoyantly rises.

  17. Pulls Apart

  18. Quiz

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