Examination of polished sections of manganese micronodules
from metalliferous sediments from the Bauer Deep reveals sequences
of ferromanganese deposition which are consistent for micronodules
from a single sediment sample and imply a common depositional
history for members of such assemblages. The relatively simple
'stratigraphy' of manganese micronodules, as compared to macronodules,
makes stratigraphic correlation of depositional histories
easier and more conclusive for micronodules than macronodules.
Quantitative microprobe analysis and X-ray mircodiffraction
patterns indicate that the major authigenic silicate component of
metalliferous sediment is an iron- and magnesium-rich, low-aluminum
nontronite.
Microprobe and X-ray microdiffraction analyses of manganese
micronodules establish todorokite as the predominant crystalline
component. Comparison of the distributions of lanthanum, cerium,
and samarium in micronodules and phosphatic fish debris indicates
that bulk sediment REE distribution is determined by the relative
abundances of cerium-enriched micronodules and cerium-depleted
biogenic phosphate. / Graduation date: 1974
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29627 |
| Date | 09 August 1973 |
| Creators | Eklund, William Alan |
| Contributors | Dymond, Jack |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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