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Site 317 belongs to a group of relatively shallow-water, highcarbonate, Central Pacific sites (including also Sites 75 and 167) which have had very limited nonbiogenic sedimentation, evidenced by very low AI2O3, during the past 30 m.y. The nonbiogenic component of the sediment from the upper part of Site 317 is relatively high in Ti, compared to other Central Pacific sites, suggesting the influence of a local basaltic source. A nearly constant MgO content probably reflects about a half percent molecular MgCθ3 in the skeletal carbonate.

Major Element Chemistry of the Tertiary Rocks at Site 317 and the Problem of the Origin of the Nonbiogenic Fraction of Pelagic Sediments