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Along which of these plate boundaries interactions, one can notice the formation of accretionary prism/wedge.
Question

Along which of these plate boundaries interactions, one can notice the formation of accretionary prism/wedge.

A.

Mid Oceanic Ridge Oceanic Plate divergence boundary

B.

Transform fault boundary

C.

Continent-Continent convergence boundary

D.

Ocean-Continent convergence boundary

Correct option is D

Introduction

  • Accretionary prisms (also called accretionary wedges) are wedge-shaped masses of sediment that accumulate at convergent plate boundaries.
  • They form through the process of subduction, where one tectonic plate descends beneath another.
  • As the oceanic plate subducts, sediments are scraped off and accumulate, forming a distinctive geological structure crucial to understanding mountain building and continental growth.

Information Booster:

  • Ocean-Continent Convergence Boundary 
  • Formation Process: Denser oceanic plate subducts beneath lighter continental plate
  • Sediments on oceanic floor and trench are scraped off (like a bulldozer)
  • Material accumulates and compresses into wedge shape
  • Wedge-shaped sedimentary mass
  • Composed of marine sediments, oceanic crust fragments, and scraped material
  • Intensely folded and faulted (thrust faults dominate)
  • Grows landward over time (oceanward dipping)
  • Width: tens to hundreds of kilometers

Additional knowledge:

  • Transform Fault Boundary
  • Plates slide horizontally past each other
  • No subduction or compression
  • Strike-slip faulting dominates
  • Continent-Continent Convergence 
  • Both plates have similar low density (no subduction)
  • Results in mountain building (orogeny)
  • Fold mountains with intense deformation
  • Crustal thickening rather than scraping

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