A microprobe study of metalliferous sediment components
1973
Eklund, William Alan
Examination of polished sections of manganese micronodulesfrom metalliferous sediments from the Bauer Deep reveals sequencesof ferromanganese deposition which are consistent for micronodulesfrom a single sediment sample and imply a common depositionalhistory for members of such assemblages. The relatively simple'stratigraphy' of manganese micronodules, as compared to macronodules,makes stratigraphic correlation of depositional historieseasier and more conclusive for micronodules than macronodules.Quantitative microprobe analysis and X-ray mircodiffractionpatterns indicate that the major authigenic silicate component ofmetalliferous sediment is an iron- and magnesium-rich, low-aluminumnontronite.Microprobe and X-ray microdiffraction analyses of manganesemicronodules establish todorokite as the predominant crystallinecomponent. Comparison of the distributions of lanthanum, cerium,and samarium in micronodules and phosphatic fish debris indicatesthat bulk sediment REE distribution is determined by the relativeabundances of cerium-enriched micronodules and cerium-depletedbiogenic phosphate.
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