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

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Abstract

The Sr isotope stratigraphy of the biogenic apatite was used to determine the age of pelagic sediments in the Brazil Basin (Station 1541) that contain ferromanganese micronodules, nodules, and coatings on the weathered volcanic rocks. The age of sediments at horizons 0–5 and 86–90 cm was estimated at 24.1 ± 0.2 Ma and 24.8 ± 0.2 Ma, respectively. The average sedimentation rate in the Late Oligocene was about 13 mm/ka. The hydrogenous Fe–Mn nodule on the sediment surface with the Mn/Fe value of 1.05–1.95 was formed at a rate of 1.2–2.4 mm/Ma, which is 1000 times lower than the growth rate of buried nodule (Mn/Fe 0.4) at depth of 83 cm. Diagenesis provoked changes in the mineral composition of the buried nodule (asbolane-buserite partially replaced by goethite), leading to the loss of a part of Mn, Ni, Li, and Tl but accumulation of trace elements linked with iron oxyhydroxides (Ce, Th, Be, As, and V) were retained. The composition of manganese micronodules at two studied depths in sediments evolved in the course of two stages of ore formation: related to the oxic and suboxic diagenesis. The Sr isotopic composition in manganese micronodules from both horizons do not differ from that of dissolved Sr in the ocean water. The 143Nd/144Nd ratio, which reflects the Nd isotopic composition in the paleocean during the micronodule formation, varies in manganese micronodules from different horizons and is constant in different size fractions.

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Correspondence to A. V. Dubinin.

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Original Russian Text © A.V. Dubinin, T.Yu. Uspenskaya, M.N. Rimskaya-Korsakova, T.P. Demidova, 2017, published in Litologiya i Poleznye Iskopaemye, 2017, No. 2, pp. 99–120.

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Dubinin, A.V., Uspenskaya, T.Y., Rimskaya-Korsakova, M.N. et al. Rare elements and Nd and Sr isotopic composition in micronodules from the Brazil Basin, Atlantic Ocean. Lithol Miner Resour 52, 81–101 (2017). https://doi.org/10.1134/S0024490217020043

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