Physics
Scientific paper
May 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..16..101l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 16, Issue 1-3, pp.101-122
Physics
4
Scientific paper
The apparent rarity of the conditions which give rise to the teart disease of cattle in central Somerset has led to a study of the distribution of molybdenum in the Lower Lias shales from which the teart soils are derived. Analyses of numerous specimens of shale from two boreholes and from outcrops on the coasts of Dorset and Glamorgan have shown considerable variation to occur over the formation but correlations have been found between the concentrations of molybdenum, vanadium, copper and nickel. The amounts of these elements in the shales are related to the organic carbon content and these together are related to the percentage of calcium carbonate, reaching a maximum with 20-50% CaCO 3 . Detailed study of one shale specimen has shown that despite the correlation of these elements with organic carbon, they are not all associated with it. Some of the molybdenum is associated with the silicates and pyrite, while nearly all the vanadium resides in the silicates. Copper and nickel appear to be mainly organically bound, although some of the latter is in exchangeable form.
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