Arc-Continent Collision (Frontiers in Earth Sciences) by Dennis Brown, Paul D. Ryan

By Dennis Brown, Paul D. Ryan

Arc-continent collision has been one of many vital tectonic approaches within the formation of mountain belts all through geological time, and it remains to be so this present day alongside tectonically energetic plate limitations comparable to these within the SW Pacific or the Caribbean. Arc-continent collision is assumed to were essentially the most vital technique fascinated with the expansion of the continental crust over geological time, and should additionally play a tremendous function in its recycling again into the mantle through subduction. knowing the geological procedures that ensue in the course of arc-continent collision is accordingly of significance for our realizing of ways collisional orogens evolve and the way the continental crust grows or is destroyed. moreover, zones of arc-continent collision are manufacturers of a lot of the worlds basic financial wealth within the type of minerals, so knowing the strategies that ensue in the course of those tectonic occasions is of value in modeling how this mineral wealth is shaped and preserved. This ebook brings jointly seventeen papers which are devoted to the research of the tectonic techniques that occur in the course of arc-continent collision. it truly is divided into 4 sections that deal to start with with the most avid gamers interested in any arc-continent collision; the continental margin, the subduction area, and eventually the volcanic arc and its mineral deposits. the second one part offers 8 examples of arc-continent collisions that diversity from being at present lively via to Palaeoproterozoic in age. The 3rd part includes papers, one who bargains with the obduction of large-slab ophiolites and a moment that provides a variety of actual types of arc-continent collision. The fourth part brings every thing that comes earlier than jointly right into a dialogue of the techniques of arc-continent collision.

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On the basis of the comparison, the onset of subduction in the Rio San Juan segment of the Caribbean Great Arc can be constrained to approximately 120 Ma. This segment was thus obviously active for more than 65 Ma. An orthogonal convergence rate of 15–25 mm/a requires that a minimum amount of 975–1,625 km of oceanic crust must have been subducted. Both petrological/geochronological data and numerical 2 Intra-oceanic Subduction Zones 33 Fig. 6 Serpentinite melange (a) forming in the spontaneously evolving subduction channel (Fig.

Results from 2D numerical modelling by Gerya et al. (2002). simulation underscore the broad spectrum of different P–T–time paths and peak conditions recorded by material subducted at different periods of time as the subduction zone evolved and matured. g. in Greater Antilles in Hispaniola, Abbott et al. 2006). Gorczyk et al. (2007a) modelled this phenomenon numerically (Fig. 7) and concluded that exhumation of such garnet-bearing peridotites can be related to fore-arc 34 Fig. V. Gerya istic P–T paths of crustal and mantle rocks (right column).

When during the margin evolution forces generated from this lateral density contrast become big enough to overcome the continental/arc crust strength then this crust starts to creep over the oceanic one (Fig. 3 Myr). This causes deflection of the oceanic lithosphere (Fig. 3 Myr) and may actually lead to its delamination from the continental/arc lithosphere (Fig. 9 Myr) thus triggering retreating subduction process (Fig. 2 Myr). This type of subduction nucleation has been successfully modelled with both analogue (Mart et al.

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