Benthic foraminifers, isotopes and varimax factors at DSDP Holes 72-517 and 72-518 ...

• Main Authors: Hodell, David A, Kennett, James P, Leonard, Kathleen A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1983
• Subjects: Drilling/drill rig; Leg72; Glomar Challenger; Deep Sea Drilling Project DSDP; Antarc*; Antarctic; NADW; North Atlantic Deep Water; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.814013; https://doi.pangaea.de/10.1594/PANGAEA.814013

Pliocene changes in the vertical water mass structure of the western South Atlantic are inferred from changes in benthic foraminiferal assemblages and stable isotopes from DSDP Holes 516A, 517, and 518. Factor analysis of 34 samples from Site 518 reveals three distinct benthic foraminiferal assemblages that have been associated with specific subsurface water masses in the modern ocean. These include a Nuttalides umbonifera assemblage (Factor 1) associated with Antarctic Bottom Water (AABW), a Globocassidulina subglobosa-Uvigerina peregrina assemblage (Factor 2) associated with Circumpolar Deep Water (CPDW), and an Oridorsalis umbonatus-Epistominella exigua assemblage associated with North Atlantic Deep Water (NADW). Bathymetric gradients in d13C between Holes 516A (1313 m), 517 (2963 m), and 518 (3944 m) are calculated whenever possible to monitor the degree of similarity and/or difference in the apparent oxygen utilization (AOU) of water masses located at these depths during the Pliocene. Changes in ... : Supplement to: Hodell, David A; Kennett, James P; Leonard, Kathleen A (1983): Climatically induced changes in vertical water mass structure of the Vema Channel during the Pliocene: evidence from Deep Sea Drilling Project Holes 516A, 517, and 518. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 907-919 ...