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During three to four <518O cycles (determined on Globigerinoides ruber), more positive S18O (= higher global ice volume) values correlated with higher Globorotalia menardii percentages, total numbers of benthic foraminifers, number of benthic foraminifer species, and the percent of total foraminifers composed of benthic foraminifers. During the same intervals, barite and insoluble residues also generally recorded higher values; however, there was no clear evidence of systematic variation in cadmium/calci um ratios (in benthic foraminifers). Maximum percentages of Globigerinoides sacculifer and Globigerinoides ruber correlate with more negative 518O (= lower global ice volume) values, although they sometimes appear to lead the 518O changes by < =4,000 yr. The increase in percentage of the tropical "divergence" planktonic foraminifer species G. menardii and the reduction of the "nondivergence" tropical species G. ruber and G. sacculifer at times of inferred ice growth is attributed to periodic intensification of divergence associated with the Equatorial Counter Current. Barite and insoluble residue sedimentation at the site also generally show a relative increase at those times.

proceedings of the ocean drilling program

Preliminary Assessment of Cyclic Variations in Foraminifers, Barite, and Cadmium/Calcium Ratios in Early Pleistocene Sediments from Hole 709C (Equatorial Indian Ocean)