Geochemistry of sediment samples from ODP Leg 135 holes

These sites were drilled during Leg 135 in the Lau Basin. The data are compared with total gamma (SGR) wireline logs at Sites 834 and 835.

Pliocene (Piacenzian) nannofossil Zone CN12, which has been identified at Sites 834 and 835, is examined in detail using spectral analyses on core and wireline logs. The potassium and calcium concentrations from the core material were used to calculate an objective depth-to-geological time stretching function, which improved the stratigraphic correlation between sites. The integrated use of chemical analyses, wireline-log data and paleomagnetic results improved confidence in the correlations obtained.