In fault models, coherent subduction of the incoming continental material occurs if the continental rise of the colliding terrane is gentle. In this case, the approaching continental sliver starts to subduct, and subduction is characterized by a non-plate-like behaviour and strong deformation of the slab.
Fault models result in locking of the trench and likely in subsequent slab break-off, if the margin of the terrane is steep and if the strength of its lower crust is high.
The combination of a strong plate contact i. The remaining lower crust and lithospheric mantle of the continental fragment continue to subduct.
The subducting plate is characterized by a non-plate-like behaviour and strong deformation of the slab. In summary, our results indicate that the following types of responses can occur by solely varying the plate contact type:. This mode is subdivided in two groups: plate-like and non-plate-like continental subduction. Shear crustal delamination of the upper crust of the incoming continental margin; subsequent continuation of subduction in a non-plate-like fashion.
Neither the slab pull magnitude nor tectonic setting in our case prescribed plate velocity of the subducting plate versus fixed subducting plate is very important to the overall geodynamics at this stage. The plate contact type, along with the slope of the incoming passive margin and the rheology of the continent, decides whether the incoming crust partially overthrusts, subducts entirely or blocks the trench leading to slab break-off.
We would like to thank the anonymous reviewer and Taras Gerya for their many critical and constructive comments and corrections. We also thank Anna Maria Marotta and Serge Lallemand for the very useful suggestions that helped to improve the manuscript. Abers G. Seismic low-velocity layer at the top of subducting slabs: observations, predictions, and systematics , Phys.
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Ranalli G. Pellegrini R. Ocean-ocean collision zone. When an oceanic and a continental plate collide, eventually the oceanic plate is subducted under the continental plate due to the high density of the oceanic plate.
Once again a benioff zone forms where there are shallow intermediate and deep focus earthquakes. As the oceanic plate is subducted sediment is scraped off to form an acretionary wedge at the point of collision between the two plates. When the oceanic plate is subducted due to partial melting of the asthenosphere magma with an andesitic composition is formed. The magma formed is less dense than the surrounding material so it rises to the surface to form a magmatic arc on the edge of the continent which the oceanic plate is subducted under.
Over time the continental margin, due to compression forms into a folded mountain belt. As time goes on the hot magma rising upward from the subduction zone causes further compression of the mountain belt. Deep mountain roots form and are gradually metamorphosed and intruded with granitic plutons. Explosive volcanic activity is commonly associated with this type of collision boundary.
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Tectonics 5: — Skip to content. Menu Search form Search term. September 22, Stanford research uses seismic data to explain continental collision beneath Tibet New imagery reveals the causes of seismic activity deep beneath the Himalaya region, contributing to an ongoing debate over the continental collision process when two tectonic plates crash into each other.
Facebook Twitter Email. By Danielle Torrent Tucker In addition to being the last horizon for adventurers and spiritual seekers, the Himalaya region is a prime location for understanding geological processes.
Klemperer is also a professor of geological sciences, by courtesy. What to read next:. Campus Life. Stanford Report Receive daily Stanford news. Stanford forecast.
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