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In order to evaluate the role of sediment subduction in the magma genesis in the Setouchi volcanic belt, SW Japan, bulk rock compositions of both pelagic sediments from the Philippine Sea (GDP 15-12) and trench-filled sediments from the Nankai Trough (DSDP site 582) were determined. The analytical result shows that trace element concentrations, particularly Pb, Ba and Th, of the pelagic sediments are much higher than those of the terrigenous sediments. Mixing calculations using these elementsdoi:10.2343/geochemj.37.503 fatcat:gqmre37j3naylbaapvwpvf2ave