By Amy E. Draut, Peter D. Clift, David W. Scholl
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Additional info for Formation and applications of the sedimentary record in arc collision zones
Melts are now considered to originate primarily in the mantle wedge above the subduction zone and are thought to result from the input of volatiles that lower the mantle solidus. In Indonesia, almost all Cenozoic magmatism seems to have been influenced by subduction, although it has not always been the direct result of melting of the mantle wedge above the subducting slab. In some cases a subduction signature is inherited from previous subduction events. , Pearce and Peate, 1995) is often used to infer the tectonic setting in ancient arcs, but if a subduction signature is inherited, volcanic arcs may be mistakenly identified in ancient orogenic belts as subduction related when they are not.
A fixed hinge may result from coupling of the subducting and overriding plate or from collision, causing the two plates to move in the same direction as the slab is being subducted. In these cases, magmatism may cease, although subduction continues, simply because the mantle wedge is not being replenished, becomes depleted, and can no longer melt. For the period since 25 Ma (Fig.
The collision caused the long subduction system to separate into two parts. West of Sulawesi, northward subduction continued in the Sunda Arc, but to the east subduction ceased, and the Australia–Philippine Sea plate boundary became a strike-slip system. Between the two, the Australia–SE Asia collision formed a mountain belt in East Sulawesi. By the late middle Miocene, at ca. 12 Ma, convergence in East Sulawesi could no longer be accommodated by orogenic contraction. At this time the oldest oceanic lithosphere in the Indian Ocean, of Late Jurassic age, arrived at the eastern end of the Java Trench.
Formation and applications of the sedimentary record in arc collision zones by Amy E. Draut, Peter D. Clift, David W. Scholl