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Point counts of 28 deep-sea sand samples indicate lithic-rich compositions occur in the West Philippine Basin (avg. Q5F17L78), Shikoku Basin (avg. Q14F15L71, and QuFπLé?), and Yamato Basin (avg. QUF15L74), but quartz and feldspar-rich compositions occur in the Japan Basin (avg. Q32F42L26). By using ratios and ternary plots of detrital components, it is possible to separate the point-counted sands into suites derived from predominantly volcanic, sedimentary, and crystalline source terrains. The predictions of provenance made from the sedimentary residue are in reasonable agreement with major rock types exposed in the source areas of the sands. An idealized scheme for the distribution of sand across a marginal basin complex indicates an increase in lithic fragments, volcanic rock fragments, and the ratio of plagioclase to total feldspar towards the frontal arc; and an increase in quartz, feldspar, and the ratio of metamorphic rock fragments over total rock fragments towards the continent. The data presented in this paper generally support this model.

Composition of Deep-Sea Sands from Marginal Basins of the Northwestern Pacific