Computer Science
Scientific paper
Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..699k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 6, pp.699-703
Computer Science
8
Scientific paper
Radio-element concentrations in two shallow-water, continental margin ferromanganese nodules from the Jervis Inlet, British Columbia, and Loch Fyne, Scotland, are markedly different from those found in deep sea manganese nodules. Compared with their deep sea counterparts, the shallow-water concretions show: (1) higher uranium (10-20ppm) and much lower thorium (2-5 ppm) contents; (2) very low Th 230 and Pa 231 activities such that these nuclides are depleted, rather than enriched, with respect to the amounts which are supported by the uranium present; and (3) two or more orders of magnitude higher growth rate. The higher growth rates, together with the data on Mn / Fe ratios and trace element contents, conform with, though do not prove, the concept of an interstitial source of manganese for nodule accretion in shallow marine environments.
Glasby G. P.
Ku Teh-Lung
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