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

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 mar...

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Bibliographic Details
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
Description
Summary: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 ...

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