Authigenic Uranium Preservation and Bottom Water Oxygenation in the Scotia Sea

DOI

Sedimentary uranium (U) and thorium (Th) isotopes are invaluable proxies to assess paleo export productivity and bottom water redox conditions, site-specific sediment focusing and vertical rain rates. We report authigenic uranium at IODP Site U1537 in the Scotia Sea and further provide bulk sediment δ234U, Th-normalized vertical rain rates, bulk element concentrations, porewater U concentration, biogenic barium and opal concentrations. Multiple proxies point to increased export productivity during interglacials in the Scotia Sea. During interglacials, the accumulation of authigenic U is controlled by the decomposition of substantial quantities of organic matter, caused by the high export productivity. Conversely, during glacial times, low export productivity is coinciding with low authigenic U, suggesting well-oxygenated bottom waters. Further, we gain new information on the development of Weddell Sea Deep Water export across the last termination into the Scotia Sea. The age model used for the last 150 ka is from Lu et al. (2022), and for earlier periods from Weber et al. (2022).

Identifier
DOI https://doi.pangaea.de/10.1594/PANGAEA.982959
Related Identifier References https://doi.org/10.1594/PANGAEA.939639
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.982959
Provenance
Creator Hallmaier, Moritz ORCID logo; Gutjahr, Marcus ORCID logo; Lippold, Jörg ORCID logo; Hemming, Sidney R ORCID logo; Gerber, Lukas ORCID logo; Weber, Michael E ORCID logo; Eisenhauer, Anton ORCID logo
Publisher PANGAEA
Publication Year 2025
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 Bundled Publication of Datasets; Collection
Format application/zip
Size 5 datasets
Discipline Earth System Research
Spatial Coverage (-40.906 LON, -59.111 LAT)