Radium, thorium, uranium, and 210 Pb in deep-sea sediments and sediment pore waters from the North Equatorial Pacific

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ID: 293016
1980
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Abstract
Determination of radium, thorium, uranium isotopes, and /sup 210/Pb 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 /sup 234/U//sup 238/U activity ratios in several samples are higher than the seawater value, indicating some enrichment of /sup 234/U in the pore water. However, the absolute concentrations of /sup 238/U and /sup 234/U are 25% lower than those in seawater, suggesting that the sediments form a sink for uranium isotopes. /sup 210/Pb is present in the pore water at concentrations approx. 20% that of /sup 226/Ra. The origin of /sup 210/Pb 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 /sup 222/Rn. /sup 230/Th is present in measurable concentrations in the pore waters, but its distribution does not show any systematic trendmore » with depth or other parameters. The most likely source of /sup 230/Th appears to be minute amounts of sediment particles collected in the pore waters during the squeezing operation.« less
Reference Key
openalex_W1969834634 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors J. Kirk Cochran, S. Krishnaswami
Journal american journal of science
Year 1980
DOI
10.2475/ajs.280.9.849
URL
https://ajs.scholasticahq.com/article/60132.pdf
Keywords Keywords not found

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