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Back-arc basins are found in areas where the subducting plate of oceanic crust is very old. The restricted width of back-arc basins is due to magmatic activity being reliant on water and induced mantle convection, limiting their formation to along subduction zones.
Back-arc basin, submarine basin that forms behind an island arc. Such basins are typically found along the western margin of the Pacific Ocean near the convergence of two tectonic plates. Back-arc basins are sites of significant hydrothermal activity, and the deep-sea vents that occur in these.
1 de feb. de 2023 · Most back-arc oceanic lithosphere on Earth today is younger than 60 Ma (Fig. 1 b), indicating that the majority of back-arc basins have closed, either by subduction of oceanic crust into the mantle, or their emplacement into orogenic belts as ophiolites (Fig. 1 c).
1 de ene. de 2023 · Six types of BABs are distinctly different. Extension of the overriding oceanic plate above a steeply dipping old oceanic plate, preferentially subducting nearly westwards, forms large deep back-arc basins with a thin oceanic-type crust.
11 de dic. de 2020 · When rifting persists, breakup occurs, and seafloor spreading takes over, creating new oceanic crust. In back-arc basins, crust emplaced in the vicinity of the arc is generally affected by the hydrous melts entrained from the arc or slab into the melt rising below the spreading axis.
16 de sept. de 2019 · The opening of back-arc basins starts with the initial rifting and crustal thinning of a pre-existing volcanic arc 1, 2, 3 until a critical amount of stretching is reached, after which...
Back-arcs can form on either oceanic crust or continental crust. In the case of oceanic crust, most back-arc regions are subjected to tensional stresses and thus develop a spreading center where new oceanic crust is formed. The composition of this new crust is similar to mid-ocean ridge basalt (MORB), although it contains higher ...
