Abstract
Oxygen and carbon isotope values from calcareous nannofossils in the mid-late Quaternary (Brunhes) interval of core from DSDP Site 594 off eastern South Island, New Zealand are compared with the δ 18O and δ 13C signal of planktic and benthic foraminifers from the same samples. Nannofossil δ 18O values appear strongly affected by non-equilibrium fractionation, in agreement with previous in-vitro studies. The nannofossil δ 18O and δ 13C signals show a strong down-core cross-correlation and a significant positive linear correlation. This is interpreted as the result of kinetic isotope effects producing non-equilibrium fractionation of both 18O and 13C. A previously reported isotope stage ⅞ carbon-shift appears to be related mainly to a Pacific-wide reduction in the abundance of gephyrocapsids rather than to any significant change in the partitioning of carbon isotopes. The strong correlation between nannofossil δ 18O and δ 13C can also be interpreted as being influenced by increased productivity during glacial intervals and decreased productivity during interglacials in subantarctic waters.
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