Dissolved and soluble pore water trace metals from sediment core SO268/1_84-1 (GC-05) during SONNE cruise SO268/1, central Pacific


We compare trace metal (Mn, Co, Cu, V, Mo, U, Cd, and As) cycling in the upper ca. 5 m of the German and Belgian license areas for polymetallic nodule mining in the Clarion Clipperton Zone in the Pacific Ocean. Considerable differences can be observed based on redox conditions, leading to Mn oxide dissolution of the solid phase as well as buried polymetallic nodules. Mobilization of metals to the pore water varies between the study sites. Interesting observations were made for Molybdenum (Mo): In the German area, dissolved Mo concentrations reached up to ca. 250 nmol/kg, while in the Belgian area, concentrations rarely rose above 100 nmol/kg. Additionally, physical and chemical trace metal speciation are important for our understanding of metal cycling and potential toxicity to marine life. Trace metals can have different bioavailability and behave differently in diffusion processes or particle-solution interactions depending on their physical and chemical forms. Here we also investigated dissolved (< 0.2 µm) and soluble ( 0.02 µm < 0.2 µm) of Cu increased with depth. Samples were taken during the SO268 cruise as part of the MiningImpact project. Sediment cores were collected with ca. 5 m long gravity corers (GC). Pore water was extracted by means of centrifugation and sequential filtration using cleaned polyethersulfone (PES) syringe filters (0.2 µm) and Anopore syringe filters (0.02 µm). Pore water was preserved by acidification to ~ pH 1.8 with concentrated ultrapure HCl. Samples were measured by Inducitvely Coupled Plasma-Mass Spectrometry.

DOI https://doi.pangaea.de/10.1594/PANGAEA.955676
Related Identifier References https://doi.org/10.58031/KIEL0219GEPH201
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.955676
Creator Paul, Sophie Anna Luise ORCID logo; Koschinsky, Andrea ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference Federal Ministry of Education and Research https://doi.org/10.13039/501100002347 Crossref Funder ID 03F0812G https://foerderportal.bund.de/foekat/jsp/SucheAction.do?actionMode=view&fkz=03F0812G JPI-O MiningImpact: Großskaliger Umwelteinfluss eines Manganknollenkollektors auf den Spurenelementkreislauf und die Bildung und das Verhalten von Sediment-Plumes
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
Resource Type Dataset
Format text/tab-separated-values
Size 702 data points
Discipline Earth System Research
Spatial Coverage (-125.925 LON, 14.036 LAT); Clarion-Clipperton Fraction Zone, North East Pacific Ocean