Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 ...

• Main Authors: Leonard, Kathleen A, Williams, Douglas F, Thunell, Robert C
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1983
• Subjects: Drilling/drill rig; Leg72; Glomar Challenger; Deep Sea Drilling Project DSDP; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.812149; https://doi.pangaea.de/10.1594/PANGAEA.812149

Stable isotopic analyses (18O/16O, 13C/12C) of both benthic and planktonic foraminifers from DSDP Holes 516A and 517 appear to reflect changing paleoclimatic and paleoceanographic conditions in the South Atlantic Ocean during the Pliocene. The d18O records of Cibicides wuellerstorfi and Globigerinoides sacculifer do not vary in phase with one another, indicating that the d18O of C. wuellerstorfi is reflecting changing glacial ice volumes, but the d18O of G. sacculifer is being influenced more by other factors, such as variable sea-surface temperatures and salinities. A net depletion in 18O and a series of very low-amplitude fluctuations characterize the late Pliocene planktonic d18O record. The stability of this section may be related to increasing surface-water temperatures in middle southern latitudes during northern hemisphere glacial ice buildup caused by differences in the phasing of the orbital precessional cycle between the northern and southern hemispheres. Hole 516A is presently located in an area ... : Supplement to: Leonard, Kathleen A; Williams, Douglas F; Thunell, Robert C (1983): Pliocene paleoclimatic and paleoceanographic history of the South Atlantic Ocean: stable isotopic records from Leg 72 Deep Sea Drilling Project Holes 516A and 517. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 895-906 ...