Stable isotopic record of late Pliocene and Pleistocene foraminifera of ODP Site 114-704 ...

• Main Authors: Hodell, David A, Ciesielski, Paul F
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1991
• Subjects: Drilling/drill rig; Leg114; Joides Resolution; Ocean Drilling Program ODP; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.754619; https://doi.pangaea.de/10.1594/PANGAEA.754619

We studied the stable isotopic and carbonate stratigraphy of ODP Hole 704A to reconstruct the paleoceanographic evolution of the eastern subantarctic sector of the South Atlantic Ocean. Site 704 is well positioned with respect to latitude (46°52.8'S, 7°25.3'E) and bathymetry (2532 m) to monitor past migrations in the position of Polar Front Zone (PFZ) and changes in deep-water circulation during the late Pliocene-Pleistocene.Several important changes occurred in proxy paleoceanographic indicators across the Gauss/Matuyama boundary at 2.47 Ma: (1) accumulation rates of biogenic sedimentary components increased by an order of magnitude (Froelich et al., this volume); (2) planktonic d1 8O values increased by an average of 0.5 per mil; (3) the amplitude of the benthic d18O signal increased; (4) the accumulation rate of ice-rafted detritus increased several fold (Warnke and Allen, this volume); and (5) carbon isotopic ratios of benthic foraminifers decreased by 0.5 per mil, as did the d13C of the fine-fraction ... : Supplement to: Hodell, David A; Ciesielski, Paul F (1991): Stable isotopic and carbonate stratigraphy of the late Pliocene and Pleistocene of Hole 704A: eastern subantarctic South Atlantic. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 409-435 ...