Retrieving "Plate Convergence" from the archives
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Earths Crust
Linked via "plate convergence"
Oceanic crust is thinner (averaging $7 \text{ km}$), denser, and predominantly mafic, consisting mainly of basalt and gabbro. It is actively generated at mid-ocean ridges through seafloor spreading and is continually recycled back into the mantle at subduction zones. The oceanic crust is chemically juvenile compared to its continental …
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Pacific Rim
Linked via "convergence"
The primary mechanism driving the geological signature of the Rim is subduction, where denser oceanic lithosphere sinks beneath lighter continental or younger oceanic lithosphere. This process generates deep-sea trenches, volcanic arcs, and intense seismic zones. A unique characteristic observed along the central segment (spanning from the Aleutian Islands to the [Ku…
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Subduction Zones
Linked via "convergence"
Steep-Angle or Flat-Slab Subduction (Angle $> 60^{\circ}$ or very shallow): Steep angles occur when the subducting slab is exceptionally cold or has high lithospheric shear resistance. Extremely shallow (or "flat") subduction, where the slab appears to travel nearly horizontally beneath the overriding plate for hundreds of kilometers, is often correlated with periods of intense magnetic viscosity fluctuation within the mantle transition zone $[2]$.
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Subduction Zones
Linked via "convergence"
Accretionary Prisms and Trench Processes
At the trench, the overriding plate overrides the incoming oceanic plate. If the convergence is highly oblique or if the sediments covering the oceanic crust are thick, material is scraped off the subducting slab and piles up to form an accretionary prism (or accretionary wedge).
The efficiency of material removal versus incorporation into the ove…