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زمینشناسی و معدن::
حوضه پس کمان
Island arcs are separated from adjacent conti- nents by a marine basin underlain by ocean crust, the backarc basin (Figs. 7.2, 7.3).
The resulting separation behind the island arc generates a backarc basin and with sufficient extension, new oceanic crust may form (example: Sea of Japan).
The garland- or drape-like alignment of the island arcs results from their separation from the continent and the formation of backarc basins.
Because the Mariana Arc comprises an intra-oceanic subduction zone, the formation of the backarc basin occurred solely within oceanic crust (Fig. 7.2).
A curious situation at subduction zones with backarc basins (Mariana-type subduction) is the juxtaposition of strong convergence and divergence.
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