Thorium and radium isotopic relationships in manganese nodules and sediments at MANOP Site S

Details Thorium and radium isotopic relationships in manganese nodules and sediments at MANOP Site S Thorium and radium isotopic relationships in manganese nodules and sediments at MANOP Site S

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..987m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.987-992

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Scientific paper

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 230 Th / 232 Th activity ratios considerably higher than other phases at this site suggesting that sea water is the likely source of Th for the nodules. Similar 230 Th / 232 Th activity ratios in nodule tops and bottoms and in certain cases departure from expected 226 Ra / 230 Th 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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