Radionuclide analysis on nodules from MANOP Site, supplement to: Moore, Willard S (1984): Thorium and radium isotopic relationships in manganese nodules and sediments at MANOP Site S. Geochimica et Cosmochimica Acta, 48(5), 987-992


Relationships among Th and Ra isotopes in nodule, sediment and water phases at MANOP Site S establish the most likely source for Th in the nodules, the frequency of nodule turning, and the similarity of micro and macro nodules. Manganese nodules and bottom waters have 230Th/232Th activity ratios considerably higher than other phases at this site suggesting that sea water is the likely source of Th for the nodules. Similar 230Th/232Th activity ratios in nodule tops and bottoms and in certain cases departure from expected 226Ra/230Th activity ratios in nodule tops and bottoms indicate that the nodules rotate every one to ten thousand years. The micro nodules have diffusion coefficients of Ra similar to macro nodule bottoms. I suggest that they may act as a carrier phase for transporting metals through oxic sediments to nodules.

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Metadata Access
Creator Moore, Willard S
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1984
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 3 datasets
Discipline Earth System Research
Spatial Coverage (-140.107W, 11.017S, -140.078E, 11.025N)
Temporal Coverage Begin 1979-05-19T00:00:00Z
Temporal Coverage End 1979-05-26T00:00:00Z