| The (Pa-231/Th-230)(xs,0) records obtained from two cores from the western (MD97-2138; 1degrees25'S, 146degrees24'E, 1900 m) and eastern (Ocean Drilling Program Leg 138 Site 849, 0degrees11.59'N, 110degrees31.18'W, 3851 m) equatorial Pacific display similar variability over the last 85,000 years, i.e., from isotopic stages 1 to 5a, with systematically higher values during the Holocene, isotopic stage 3, and isotopic stage 5a, and lower values, approaching the production rate ratio of the two isotopes (0.093), during the colder periods corresponding to isotopic stages 2 and 4. We have also measured the Th-230-normalized biogenic preserved and terrigenous fluxes, as well as major and trace elements concentrations, in both cores. The (Pa-231/Th-230)(xs,0)... |
