Trench basins, which form oceanward of magmatic arcforearc basin systems on the slope between the trench and subduction complex, are sedimentary records of the tectonic evolution of convergent margins (Moore & Karig, 1976). Whether ocean trenches are sediment starved (<1 km sediment thickness) or sediment rich (>5 km) depends on a number of factors, including proximity to major sediment routing
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