Stable isotope ratios of benthic and planktonic foraminifera from Miocene to Pliocene sediments of DSDP Hole 7-62A on the Eauripik Rise, Pacific Ocean (Table 1)

• Main Authors: Resig, Johanna M, Kroopnick, Peter M
• Format: Dataset
• Language: English
• Published: PANGAEA 1983
• Subjects: 7-62A; AGE; Calculated from stable oxygen isotopes; Deep Sea Drilling Project; DEPTH; sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Foraminifera; benthic δ13C; benthic δ18O; Globigerinoides sacculifer; δ13C; δ18O; Globorotalia tumida; Glomar Challenger; Isotope ratio mass spectrometry; Leg7; North Pacific/RIDGE; Planktic foraminifera zone; Sample code/label; Siphouvigerina sp.; Streptochilus globulosum; Temperature; calculated; Uvigerina spp.; Pacific; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.682292; https://doi.org/10.1594/PANGAEA.682292

Oxygen and carbon isotope analyses show that the biserial forarniniferal genus Streptochilus, which was originally described from pelagic sediments on the Eauripik Rise and Ontong Java Plateau, lived deep in the upper water column within the oxygen minimum layer. The species of Streptochilus average from 4 to 19% of the foraminiferal assemblages in which benthic forms compose less than 1 or 2%. Specimens of Streptochilus are selectively dissolved when in contact with the bottom water mass. Their rapid evolutionary turnover of less than a few million years and their wide areal distribution in the equatorial Indo-Pacific are indicative of planktonic foraminifera. Aside from usefulness of the species of Streptochilus as stratigraphic indices, these Neogene biserial planktonic foraminifera are potential indices of paleoceanographic stratification.