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JordanOceanic lithosphere is subducted under continental lithosphere at convergent plate boundaries. This process occurs when the denser oceanic plate sinks beneath the less dense continental plate, creating deep ocean trenches and volcanic arcs. The subducted oceanic plate eventually melts and contributes to the formation of magma that leads to volcanic activity.
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Why is oceanic lithosphere subducted during and oceanic continental collision where as the continental plate is not?
Oceanic lithosphere is denser than continental lithosphere, so it is more likely to be subducted during a collision. The downward force exerted by the dense oceanic plate causes it to sink beneath the less dense continental plate. Furthermore, oceanic lithosphere is typically thinner and more malleable, making it easier to be forced beneath the continental lithosphere.
What happens when continental and oceanic lithospheres collide?
When continental and oceanic lithospheres collide, the denser oceanic plate is usually subducted beneath the less dense continental plate due to the difference in density. This can lead to the formation of volcanic arcs on the overriding continental plate and deep-sea trenches where the oceanic plate is subducted. The collision can also result in mountain building and the formation of complex geological structures.
Is the lithosphere thinner under the oceanic or continental crust?
The lithosphere is generally thinner under oceanic crust compared to continental crust. Oceanic lithosphere is typically around 5-10 kilometers thick, while continental lithosphere can be up to 200 kilometers thick. This difference is due to variations in temperature and composition between the two types of crust.
When an ocean plate collides with a continental plate it does what?
When an oceanic plate collides with a continental plate, the denser oceanic plate is subducted beneath the continental plate due to its weight. This subduction can lead to the formation of deep ocean trenches, volcanic arcs, and seismic activity.
Subduction of oceanic lithosphere under a continental block gives rise to what type of geologic structure that is characterized by a continental volcanic arc and associated igneous plutons?
The subduction of oceanic lithosphere under a continent forms a volcanic arc on the continental margin. This arc is characterized by intense volcanic activity producing a chain of stratovolcanoes and igneous plutons intruding into the continental crust.
