Ocean-Continent Convergent Plate Boundaries ( Read ) | Earth Science | CK Foundation
If both plates meet with continental crust, there will be mountain building. The oceanic plate subducts into a trench, resulting in earthquakes. When two oceanic plates collide one oceanic plate is eventually subducted under the When an oceanic and a continental plate collide, eventually the oceanic. Collision between oceanic and continental lithosphere When the subducting oceanic plate sinks deeper than kilometers, huge lithosphere meet head- on, neither one can sink because both plates are too buoyant.
Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. The denser plate is subducted underneath the less dense plate.
List of tectonic plate interactions
The plate being forced under is eventually melted and destroyed. Where oceanic crust meets ocean crust Island arcs and oceanic trenches occur when both of the plates are made of oceanic crust.
Zones of active seafloor spreading can also occur behind the island arc, known as back-arc basins. These are often associated with submarine volcanoes.
Where oceanic crust meets continental crust The denser oceanic plate is subducted, often forming a mountain range on the continent. The Andes is an example of this type of collision. Where continental crust meets continental crust Both continental crusts are too light to subduct so a continent-continent collision occurs, creating especially large mountain ranges. The most spectacular example of this is the Himalayas.
BBC Bitesize - GCSE Geography - Plate boundaries - Eduqas - Revision 3
Divergent boundaries — where two plates are moving apart. The space created can also fill with new crustal material sourced from molten magma that forms below. Once again a benioff zone forms where there are shallow intermediate and deep focus earthquakes. As the oceanic plate is subducted sediment is scraped off to form an acretionary wedge at the point of collision between the two plates.
When the oceanic plate is subducted due to partial melting of the asthenosphere magma with an andesitic composition is formed. The magma formed is less dense than the surrounding material so it rises to the surface to form a magmatic arc on the edge of the continent which the oceanic plate is subducted under.
List of tectonic plate interactions - Wikipedia
Over time the continental margin, due to compression forms into a folded mountain belt. As time goes on the hot magma rising upward from the subduction zone causes further compression of the mountain belt.
Deep mountain roots form and are gradually metamorphosed and intruded with granitic plutons. Explosive volcanic activity is commonly associated with this type of collision boundary. This is shown in the diagram below. The major componants of an oceanic - continental collision zone and a accretionary wedge are also shown in the diagrams below.Plate Tectonics Explained
Deformation at an ocean-continent collision zone Continent-Continent Collision When two continental plates collide neither plate can be subducted due to their high bouyancy.
With this type of collision there are no features such as a subduction zone, trench or acretionary wedge. The collision of two continental plates occurs when a sea becomes narrower until both plates collide.
After collision the oceanic lithosphere breaks off and sinks into the mantle. The crust is thickened by the underthrusting of one continent under the other. These regions have both shallow focus earthquakes and deep focus earthquakes as the oceanic lithosphere is subducted under the mounatin range.
Thrust faults and highly metamorphised granites are common charcteristics of these collision zones.