(Table 1) Nd isotope ratios of ODP Leg 208 samples ...

• Main Authors: Thomas, Deborah J, Via, Rachael K
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: Event label; DEPTH, sediment/rock; AGE; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; ε-Neodymium T; ε-Neodymium, error; Drilling/drill rig; Leg208; Joides Resolution; Ocean Drilling Program ODP; Labrador Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.833136; https://doi.pangaea.de/10.1594/PANGAEA.833136

We present new Nd isotope records from Walvis Ridge Ocean Drilling Program (ODP) sites 1262–1264 (southeastern Atlantic) spanning the past 24 Ma to investigate the Neogene evolution of Atlantic thermohaline circulation. The new data indicate that deepwater epsilon-Nd(t) values from ODP Site 1262 decrease from -11.0 at 10.6 Ma to -12.5 by 7.3 Ma. This decrease parallels the Nd isotope trends contained in Fe-Mn crust records from the northwestern Atlantic; however, the shift at ODP Site 1262 (4755 m water depth) occurred up to ~6 Ma earlier than the corresponding changes in crust records from the Atlantic and earlier than any Atlantic site shallower than 2700 m paleowater depth. Recent interpretations of the rapid decrease in Fe-Mn crust Nd epsilon-Nd(t)ss values invoke changes in weathering inputs to the Labrador Sea region rather than a fundamental change in deepwater convection in the Labrador Sea. However, the new evidence for significant depth stratification of the Nd isotope signal in the southeastern ... : DEPTH, sediment/rock is given in mcd. ...