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Diagram of the geological process of subduction. Subduction is a geological process in which the oceanic lithosphere and some continental lithosphere is recycled into the Earth's mantle at the convergent boundaries between tectonic plates.
The figure is a schematic diagram depicting a subduction zone. The subduction slab on the right enters the mantle with a varying temperature gradient while importing water in a downward motion. A model of the subducting Farallon slab under North America. In geology, the slab is a significant constituent of subduction zones. [1]
Some troughs look similar to oceanic trenches but possess other tectonic structures. One example is the Lesser Antilles Trough, which is the forearc basin of the Lesser Antilles subduction zone. [8] Also not a trench is the New Caledonia trough, which is an extensional sedimentary basin related to the Tonga-Kermadec subduction zone. [9]
The direction of the subduction system changes since the break-off of slab creates the space, which is the major parameter of this model. [4] The evolution diagram showing how the subduction reversal initiated by a break-off slab at subducting plate: Brown colour is the less dense continental crusts; White colour is the oceanic crust; 1. Two ...
Diagram of a cross-section of the Patagonia slab window. The Nazca plate and Antarctic plate are colliding with the South American plate at the Chile Ridge. [1]In geology, a slab window is a gap that forms in a subducted oceanic plate when a mid-ocean ridge meets with a subduction zone and plate divergence at the ridge and convergence at the subduction zone continue, causing the ridge to be ...
The subduction process consumes older oceanic lithosphere, so oceanic crust is seldom more than 200 million years old. [28] The overall process of repeated cycles of creation and destruction of oceanic crust is known as the Supercontinent cycle , first proposed by Canadian geophysicist and geologist John Tuzo Wilson .
Subduction zones are caused when two tectonic plates converge on each other and one plate is pushed beneath the other. [34] In a marine setting, this typically occurs when the oceanic crust subducts below the continental crust , resulting in volcanic activity and the development of deep ocean trenches. [ 35 ]
Schematic depiction of the process of slab detachment. OC=oceanic crust, OLM=oceanic lithospheric mantle, CC=continental crust, CLM=continental lithospheric mantle In plate tectonics, slab detachment or slab break-off may occur during continent-continent or arc-continent collisions.