(Tables 1,2 and 3, pages 853-854) Isotopic data for the solid-phase of three sediment box cores from the DOMES Sites A, B and C in the Pacific Ocean


Determination of radium, thorium, uranium isotopes, and 210Pb in sediments and sediment pore waters from North Equatorial Pacific deep-sea clay-silicous oozes shows that the radium and uranium isotopes are mobile in the pore water. The concentration-depth profiles of radium can be understood in terms of a diagenetic model which takes into account mixing of sediment particles by bioturbation, molecular diffusion in the pore water, adsorption onto particle surfaces, as well as radioactive production and decay. The 234U/238U activity ratios in several samples are higher than the seawater value, indicating some enrichment of 234U in the pore water. However, the absolute concentrations of 238U and 234U are 25% lower than those in seawater, suggesting that the sediments form a sink for uranium isotopes. 210Pb is present in the pore water at concentrations approx. 20% that of 226Ra. The origin of 210Pb in the pore water is uncertain and could be due either to its in situ mobilization in the sediments or subsequent production in the laboratory from the decay of 222Rn. 230Th is present in measurable concentrations in the pore waters, but its distribution does not show any systematic trend with depth or other parameters. The most likely source of 230/Th appears to be minute amounts of sediment particles collected in the pore waters during the squeezing operation.

From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

Supplement to: Cochran, J Kirk; Krishnaswami, Seth (1980): Radium, thorium, uranium, and 210 Pb in deep-sea sediments and sediment pore waters from the North Equatorial Pacific. American Journal of Science, 280(9), 849-889

DOI https://doi.org/10.1594/PANGAEA.880253
Related Identifier https://doi.org/10.2475/ajs.280.9.849
Related Identifier https://doi.org/10.7289/V52Z13FT
Related Identifier https://doi.org/10.7289/V53X84KN
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.880253
Creator Cochran, J Kirk; Krishnaswami, Seth
Publisher PANGAEA
Publication Year 1980
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 462 data points
Discipline Earth System Research
Spatial Coverage (-151.190W, 9.038S, -125.907E, 15.327N); Pacific Ocean; DOMES Site B, Pacific Ocean; DOMES Site C, Pacific Ocean
Temporal Coverage Begin 1975-10-29T00:00:00Z
Temporal Coverage End 1975-11-13T00:00:00Z