Rare elements and Nd and Sr isotopic composition in micronodules from the Brazil Basin, Atlantic Ocean

Дубинин, А. В.; Uspenskaya, T. Yu.; Rimskaya-Korsakova, M. N.; Demidova, T. A.

doi:10.1134/s0024490217020043

Cited by 13 publications

(20 citation statements)

References 30 publications

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“…Some nodules contain a moderate amount of 10 Å manganate minerals (buserite, asbolane-buserite), which could reflect diagenetic Mn contribution. Mineral composition of the buried nodule 1541_83 was described by Dubinin et al [36]. Manganese minerals were replaced along with the periphery of columnar framboids by low crystallized goethite FeOOH ( Figure 3) with relict growth structures.…”

Section: Resultsmentioning

confidence: 77%

“…The buried nodule nod 1541_83 is unique in its composition with Mn/Fe ratio of 0.41 together with Fe enrichment (23.5%). This nodule is depleted in copper, nickel, cobalt, and zinc relatively to the nodule on the surface sediments [36]. The Ce anomaly value reaches 41 (normalized to Post Archean Australian Shale (PAAS)), because the contents of trivalent rare earth elements are too low ( Figure 4).…”

Section: Resultsmentioning

confidence: 97%

“…The accuracy of determination methods was controlled using reference samples: basalt (BCR-1, BCR-2), andesite (AGV-1), and Fe-Mn nodule (NOD-P-1, OOPE-601 and OOPE-602). The ages of the teeth from nodule 2188-Th4 and from surface sediments were determined using the method of strontium isotopic stratigraphy (SIS) [35] described in previous works [36,37]. The rate of ferromanganese crust growth was estimated by cobalt chronometer in accordance with the equation: V (mm•Ma −1 ) = 0.68/[Co] 1.67 [38,39].…”

Section: Samplesmentioning

confidence: 99%

“…By its chemical composition, this buried nodule does not belong to any of genetic types of ferromanganese nodules. Diagenetic redistribution of matter that occurred after the nodule burial affected its composition significantly [36]. This led to partial Mn reduction and replacement of manganese minerals with goethite.…”

Section: Platinum Group Elements In Buried Nodulesmentioning

confidence: 99%

“…PGE content (ng/g) in ferromanganese crust and nodules from the Cape and Brazil Basins. Ma[36]. Assuming the age of nodule 1541_0 does not exceed the age of underlying sediments, its growth rate equals 1.2-2.4 mm•Ma −1 .…”

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confidence: 99%

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Accumulation of Platinum Group Elements in Hydrogenous Fe–Mn Crust and Nodules from the Southern Atlantic Ocean

et al. 2018

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Distribution of platinum group elements (Ru, Pd, Pt, and Ir) and gold in hydrogenous ferromanganese deposits from the southern part of the Atlantic Ocean has been studied. The presented samples were the surface and buried Fe-Mn hydrogenous nodules, biomorphous nodules containing predatory fish teeth in their nuclei, and crusts. Platinum content varied from 47 to 247 ng/g, Ru from 5 to 26 ng/g, Pd from 1.1 to 2.8 ng/g, Ir from 1.2 to 4.6 ng/g, and Au from less than 0.2 to 1.2 ng/g. In the studied Fe-Mn crusts and nodules, Pt, Ir, and Ru are significantly correlated with some redox-sensitive trace metals (Co, Ce, and Tl). Similar to cobalt and cerium behaviour, ruthenium, platinum, and iridium are scavenged from seawater by suspended ferromanganese oxyhydroxides. The most likely mechanism of Platinum Group Elements (PGE) accumulation can be sorption and oxidation on δ-MnO 2 surfaces. The obtained platinum fluxes to ferromanganese crusts and to nodules are close and vary from 35 to 65 ng•cm −2 •Ma −1. Palladium and gold do not accumulate in hydrogenous ferromanganese deposits relative to the Earth's crust. No correlation of Pd and Au content with major and trace elements in nodules and crusts have been identified.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 97%