Why do oceanic plates dive underneath continental plates when they collide?
"When two oceanic plates collide, the plate that is older, therefore colder and denser, is the one that will sink. The rest of the story is a lot like the continental vs. oceanic plate collision we described above. Once again, a sun ducting zone forms and a curved volcanic mountain chain forms above the sub ducting plate."
AKA google
두해양판이충돌하면하나의해양판이결국다른판아래✧섭입됩니다。 한판이다른판아래✧미끄러zippy는곳을'섭입대'라고합니다。 섭입판이맨틀✧내려가면서점차가열되고있는베니오프영역이형성됩니다。
When oceanic plates collide with continental plates, the denser oceanic plate tends to subduct or dive underneath the less dense continental plate. This phenomenon is mainly driven by the differences in density and composition between these two types of plates.
To understand why this happens, you need to consider a few key factors:
1. Density: Oceanic plates are generally denser than continental plates due to their composition. Oceanic crust is primarily made up of basalt, which is denser than the granite that comprises most of the continental crust.
2. Thickness: Oceanic plates are thinner compared to continental plates, which are generally thicker. The thinner and denser oceanic plate is more prone to sliding beneath the thicker and less dense continental plate.
3. Composition: Oceanic crust is filled with basaltic rocks, which are rich in iron and magnesium. These minerals make the oceanic crust denser and heavier than the continental crust, which consists mostly of lighter granitic rocks.
Due to these differences, when an oceanic plate collides with a continental plate, it starts to subduct beneath it. The subduction occurs because the denser and thinner oceanic plate is more buoyant compared to the thicker and less dense continental plate. This creates a gravitational force that causes the oceanic plate to sink into the hotter mantle beneath.
As the oceanic plate subducts, it moves into the subduction zone, where it encounters increasing pressure and temperature. The heat and pressure cause the subducted plate to partially melt, generating magma. This magma may then rise to the surface, leading to volcanic activities associated with subduction zones.
It's important to note that subduction is a complex process influenced by various geological factors such as plate boundaries, convergence rates, and angles of collision. The study of plate tectonics provides further insights into the mechanics behind plate interactions and subduction.
두 해양 판이 충돌하면 하나의 해양 판이 결국 다른 판 아래로 섭입됩니다. 한 판이 다른 판 아래로 미끄러지는 곳을 '섭입대'라고 합니다. 섭입판이 맨틀로 내려가면서 점차 가열되고 있는 베니오프 영역이 형성됩니다.
(When two oceanic plates collide one oceanic plate is eventually subducted under the other. Where one plate slides under the other is referred to as the 'subduction zone'. As the subducting plate descends into the mantle where it is being gradually heated a benioff zone is formed.)