Authigenic neodymium isotopes and rare earth element data of sediment samples from ODP Site 982

Table 1 Title: Neodymium isotope compositions of Fe–Mn oxyhydroxide leachates from ODP Site 982, North Atlantic Abstract: Neodymium isotope compositions (143Nd/144Nd, εNd) were measured on Fe–Mn oxyhydroxide leachates extracted from bulk sediments at ODP Site 982 (Rockall Plateau, North Atlantic; 57°30.992N, 15°52.001W; 1135 m water depth). Leaching was performed using a hydroxylamine hydrochloride solution to selectively dissolve the authigenic Fe–Mn oxyhydroxide fraction, which records past seawater Nd isotope signatures. Nd isotopes were determined by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The data are used to reconstruct changes in intermediate water mass provenance in the North Atlantic across glacial–interglacial cycles and to investigate the role of ice-sheet dynamics in driving these shifts. Keywords: neodymium isotopes, authigenic Fe–Mn oxyhydroxide, ODP Site 982, North Atlantic, paleoceanography, glacial–interglacial Table 2 Title: Particulate neodymium isotope compositions in bulk sediment from ODP Site 982, North Atlantic Abstract: Neodymium isotope compositions (143Nd/144Nd, εNd) were measured on the detrital (particulate) fraction of bulk sediments from ODP Site 982 (Rockall Plateau, North Atlantic; 57°30.992N, 15°52.001W; 1135 m water depth). Samples were processed to remove the authigenic and carbonate components prior to total digestion of the residual detrital phase. Nd isotopes were determined by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The detrital εNd data serve to characterize the provenance of terrigenous material delivered to the site and to assess potential detrital contamination of the authigenic leachate signal. Keywords: neodymium isotopes, detrital, sediment provenance, ODP Site 982, North Atlantic, paleoceanography Table 3 Title: Major and rare earth element concentrations of Fe–Mn oxyhydroxide leachates from ODP Site 982, North Atlantic Abstract: Concentrations of major elements (Al, P, Ca, Mn, Fe) and rare earth elements (Y, La–Lu) were measured in Fe–Mn oxyhydroxide leachates extracted from bulk sediments at ODP Site 982 (Rockall Plateau, North Atlantic; 57°30.992N, 15°52.001W; 1135 m water depth). Leaching was performed using a hydroxylamine hydrochloride procedure targeting the authigenic Fe–Mn oxyhydroxide phase. Elemental concentrations were determined by inductively coupled plasma mass spectrometry (ICP-MS, iCAP). These data are used to evaluate the selectivity of the leaching procedure (e.g., via Al/Nd ratios as indicators of detrital contamination), to examine REE patterns and to support the interpretation of the corresponding authigenic εNd record. Keywords: rare earth elements, major elements, Fe–Mn oxyhydroxide, leachate geochemistry, ODP Site 982, North Atlantic Table 4 Title: Neodymium isotope compositions of secondary standard solution and reference materials for external reproducibility assessment Abstract: Neodymium isotope compositions (143Nd/144Nd, εNd) of secondary standard solutions and reference materials were measured alongside samples to monitor the external reproducibility of Nd isotope analyses. Measurements were performed by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The data document the long-term analytical precision and accuracy of the Nd isotope measurements reported in this study. Keywords: neodymium isotopes, analytical reproducibility, reference materials, quality control, MC-ICP-MS Forward mixing model python code Description:The Python code implementing the forward mixing model with Monte Carlo uncertainty propagation used in Xu et al. (2026), published in Science Advances. The model reconstructs glacial–interglacial shifts in seawater neodymium isotope compositions (εNd) at ODP Site 982 (Rockall Plateau, North Atlantic) by projecting ice-volume changes from the LR04 benthic δ¹⁸O stack through a two-endmember mixing framework (Icelandic vs. background North Atlantic sources), with a dual-period modulation scheme calibrated to the Last Glacial Maximum.