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87Sr/86Sr ratios of ocean -floor sediments from the NW Pacific result from mixing between island-arc detritus (0.7037) and open-ocean detritus derived from the upper continental crust (0.7175). Sediments lying within and immediately in front of the Kurile-Kamchatka trench change from a c. 500 m sequence rich in open-ocean detritus in front of the south-central Kuriles to a c. 1000 m sequence, the Meiji sediment tongue, rich in island-arc detritus in front of the northern section of the arc.doi:10.2343/geochemj.30.289 fatcat:6po4hyi6obcknjliax6oweqthe