accretionary wedge


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accretionary wedge

or

accretionary prism

n
(Geological Science) geology a body of deformed sediments, wedge-shaped in two dimensions or prism-shaped in three dimensions, that has been scraped off the surface of the oceanic lithosphere as it moves downwards beneath a continent or island arc. The sediments are added to the continental edge
References in periodicals archive ?
East-directed crustal thrusts developed, producing the exhumation of both the basal accretionary wedge and a part of the oceanic crust, as well as the thrusting of the ChMC units over the no- or low grade metamorphic Arrayan and Huentelauquen formations (Fig.
The deposition continued once the accretionary wedge was already developed and formed an outer ridge that separated a retrowedge basin (Arrayan basin) from the open sea.
The succession is part of the emergent Makran Accretionary Wedge, which formed in response to the northward subduction of the oceanic crust of the Gulf of Oman under the southern margin of the Afghan Block of the Eurasian Plate (White and Clittgord, 1976; Farhaudi and Karig, 1977; Jacob and Quittmeyer,1979; White, 1979; Platt et al.
Thrust-bound inliers of the Cretaceous- Palaeocene age comprise minor proportion of the vast area of the Makran Accretionary Wedge.
This phenomenon can be explained by a presence of intrabed slips and in general, by total strip thrust in the vicinity of the apical part of the Variscan accretionary wedge by its overthrusting the brunovistulicum (e.
From the information recorded in the cores, the research team can draw conclusions on the mechanics of the accretionary wedge.
As the leeward accretionary wedge developed, the subsequent surface was only drowned at exceptional high tides and became converted to sabkha as the accretion proceeded.
Although many metamorphogenic gold deposits are small and high-grade, the Muruntau deposit in Uzbekistan, hosted by a deformed accretionary wedge of Paleozoic age, is the world's largest open-pit gold deposit[13].
The models of the central and eastern SR/PP show that the accretionary wedge develops a prominent culmination structure with fault-bend fold geometry over the frontal ramp.
2) the subduction complex, or accretionary wedge, where deformed rocks adhere as a result of subduction;
The closing of ocean basins through subduction means that the ultimate fate of these turbidite sequences is to be highly fragmented and deformed in subduction zone accretionary wedges and eventually to form part of collisional orogenic belts, and become welded into the crystalline metamorphic fabric of continental crust.
The Barga Terrane is interpreted as having formed in ocean-margin environment with active island-and-Andean type magnetic arcs, rifted basis, accretionary wedges and continental margins.