Dissolved rare earth element and yttrium and manganese concentrations in pore water from sediment cores from the Atlantic (MSM96)

DOI

The Neodymium (Nd) isotopic signature (εNd) has been widely used as a proxy to reconstruct past ocean circulation. Recently it has been increasingly questioned which archives can be reliably used to extract authigenic εNd used for the reconstruction of past ocean circulation and under which environmental conditions bottom seawater εNd are altered and the original water mass signature is overprinted. Pore waters of marine sediments are the key environment in which early diagenetic exchange processes between seawater-derived Nd and terrigenous solid phases take place. This dataset contains rare earth element and yttrium (REY) and manganese (Mn) concentrations of pore water and MUC overlying botom seawater from the abyssal Atlantic Ocean. Pore waters are oxic (no elevated Mn) and REY pore-water concentrations are low with 10-40 pM.Samples were collected during cruise MSM96 in 2020. Pore waters were sampled from MUC liners and for some samples several liners were pooled to acquire sufficient volume, especially for samples for which also Nd isotopes were measured. Sediments were centrifuged and the supernatant (i.e., the pore water) and the MUC bottom water were filtered through 0.2 µm pore size by different techniques (polyethersylfone (PES) syringe filters and nuclepore membrane filters using gas pressure). Pore water and seawater was preserved by acidification to ~ pH 1.8 with concentrated ultrapure HCl. REY and Mn for filtered samples were preconcentrated offline using a seaFAST (Elemental Scientific Inc., Nebraska, USA) with a 10 mL sample loop and using a NOBIAS PA-1 resin column. Samples were spiked with 100 ppt Tm and In to monitor yields and all REY were Tm corrected at the end of the data evaluation. Correction was usually within 5-15%. Preconcentrated samples were measured on a Thermo Fisher Element HR-ICP-MS (GEOMAR, Kiel) coupled to a CETAC Aridus 2 desolvating nebulizer for increased sensitivity and decreased oxide formation.Diffusive gradients in thin films (DGTs) were deployed for 12.5 and 28.4 hours at 5°C. Membranes were cut into 1-4 cm slices, eluted with 1 M HNO3 and measured by quadrupole ICP-MS (Perkin Elmer Nexion 350x). Sample concentrations were then calculated following methods described in Zhang and Davison (1995). The different methods lead to different results and based on a comparison of concentration data and shale-normalized REY patterns, syringe filtered samples were deemed most reliable.

Identifier
DOI https://doi.pangaea.de/10.1594/PANGAEA.982937
Related Identifier IsPartOf https://doi.pangaea.de/10.1594/PANGAEA.981262
Related Identifier References https://doi.org/10.1021/ac00115a005
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.982937
Provenance
Creator Paul, Sophie Anna Luise ORCID logo
Publisher PANGAEA
Publication Year 2025
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 458637508 Early diagenetic alteration of rare earth element and yttrium (REY) signals in marine sediments and impact on the use of REY as tracers in past and present marine environments
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 4538 data points
Discipline Earth System Research
Spatial Coverage (-17.700W, 37.908S, -14.512E, 48.100N); North Atlantic Ocean
Temporal Coverage Begin 2020-10-14T20:46:02Z
Temporal Coverage End 2020-11-06T13:39:04Z