Stable oxygen and carbon isotope ratios of foraminifera from Oligocene to Miocene sediments of DSDP Hole 39-354 from Ceara Rise, West Altlantic (Table 1) ...

• Main Author: Biolzi, Milena
• Format: Dataset
• Language: English
• Published: PANGAEA 1983
• Subjects: ORDINAL NUMBER; Sample code/label; Planktic foraminifera zone; Globigerina venezuelana, δ18O; Globigerina venezuelana, δ13C; Catapsydrax dissimilis, δ18O; Catapsydrax dissimilis, δ13C; Globigerinoides ruber, δ18O; Globigerinoides ruber, δ13C; Globigerinoides trilobus, δ18O; Globigerinoides trilobus, δ13C; Globoquadrina dehiscens, δ18O; Globoquadrina dehiscens, δ13C; Globoquadrina globularis, δ18O; Globoquadrina globularis, δ13C; Globorotalia mayeri, δ18O; Globorotalia mayeri, δ13C; Globorotalia kugleri, δ18O; Globorotalia kugleri, δ13C; Globorotalia opima opima, δ18O; Globorotalia opima opima, δ13C; δ18O, carbonate; δ13C, carbonate; Cibicidoides pseudoungerianus, δ18O; Cibicidoides pseudoungerianus, δ13C; Globocassidulina subglobosa, δ18O; Globocassidulina subglobosa, δ13C; Oridorsalis umbonatus, δ18O; Oridorsalis umbonatus, δ13C; Stilostomella spp., δ18O; Stilostomella spp., δ13C; Foraminifera, benthic δ18O; Foraminifera, benthic δ13C; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg39; Glomar Challenger; Deep Sea Drilling Project DSDP; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.690399; https://doi.pangaea.de/10.1594/PANGAEA.690399

The oxygen- and carbon-isotope compositions of planktic and benthic foraminifera and calcareous nannofossils from Middle Oligocene-Early Miocene Equatorial Atlantic sediments (DSDP Site 354) indicate two important paleoceanographic changes, in the Late Oligocene (foraminiferal Zone P.21) and in the Early Miocene (foraminiferal Zone N.5). The first change, reflected by a delta18O increase of 1.45‰ in Globigerina venezuelana, affected only intermediate pelagic and not surface, deep or bottom waters. The second change affected surface and intermediate waters, whereas deep and bottom waters showed only minor fluctuations. In the case of the former the isotope effect of the moderate ice accumulation on the Antarctic continent is amplified in the Equatorial Atlantic by changes in the circulation pattern. The latter paleoceanographic change, reflected by a significant increase in 18O in both planktic and benthic forms (about 1.0‰ and 0.5‰, respectively), may have been caused by ice volume increase and temperature ... : Analyzed specimens: planktic foraminifera 20-30, benthic foraminifera 5-12 ...