Neodymium isotope ratios of fish teeth from ODP Site 113-689 (Appendix A) ...

• Main Authors: Scher, Howie D, Martin, Ellen E
• Format: Dataset
• Language: English
• Published: PANGAEA 2004
• Subjects: DEPTH, sediment/rock; AGE; Samarium-147/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; ε-Neodymium 0; ε-Neodymium T; ε-Neodymium, standard deviation; Neodymium; Composite Core; Thermal Ionization Mass Spectrometry TIMS; Calculated; Leg113; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctica; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.708129; https://doi.pangaea.de/10.1594/PANGAEA.708129

Long-term records of neodymium (Nd) isotopes from sedimentary archives can be influenced by both changes in water mass mixing and continental weathering. Results of Nd isotopic analyses of fossil fish teeth from ODP Site 689 (Maud Rise, Southern Ocean) provide a long, continuous, high-resolution marine sediment Nd isotope record (expressed in epsilon-Nd units). Correlation of down core secular variations between the epsilon-Nd record, delta13C values from benthic foraminifera, and clay mineral assemblages demonstrates that long-term variability of Nd isotope ratios reflect changes in ocean circulation, and that only minor fluctuations in epsilon-Nd values are associated with changes in continental weathering on Antarctica. Nonradiogenic epsilon-Nd values at Site 689 during the middle Eocene require the contribution of an end member with epsilon-Nd <- 9.5. Southern Ocean deep water may have been too radiogenic in the middle Eocene (epsilon-Nd = -8.5), though this end member may not be fully characterized. ... : Age model after Mead and Hodell (1995, doi:10.1029/94PA03069) referred to the time scale of Cande and Kent (1995, doi:10.1029/94JB03098). Fish teeth from the size fraction >125 µm ...