Between Taiwan and the Molucca strait, an arc-arc collision migrating southward between late Oligocene and early or mid-Pliocene time was followed by renewed subduction at the former sites of arc-associated wrenching. Possibly triggered by polarity changes along strike of the collision, the postcollisional trenches are offset and of opposed polarity. Their combined motion leads to rotation of the convergence system relative to its foreland areas. Examples of such rotating systems are also found in the circum-Mediterranean orogenic complexes.

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