The composition of ferromanganese nodules of the Chukchi and East Siberian seas |
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| Authors: | G N Baturin V T Dubinchuk |
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| Institution: | (1) Sea Around Us Project, Fisheries Centre, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada;(2) Earth & Ocean Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada |
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| Abstract: | Ferromanganese nodules from the floors of the Chukchi and East Siberian seas were examined by means of analytical electron
microscopy and plasmic and chemical analysis. It was found that the nodules consisted of aggregates of colloform and poorly
crystallized matter of globular and irregular shapes, in which the minerals of iron and manganese were mainly presented by
hematite, vernadite, and asbolane. The samples from the Chukchi Sea contained single micrograins of native gold. The tested
nodules were comparable to oceanic ones in iron content. The contents of manganese, ore elements, and most of microelements
are well below those of the ocean. The comparison of the composition of bottom sediments and considered nodules showed that
the latter were enriched during their formation by factors of 100–200 in manganese, of 10–18 in cobalt, and of 4–8 in iron,
nickel, and zinc. However, the process of diagenetic accumulation of metals by nodules in the marine environment is less effective
than in the open ocean with the sediments of higher con-tent of mobile element forms and of higher exposure time compared
to marine sediments. |
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