Dubinin, Alexander V; Rimskaya-Korsakova, Maria N (2011): Chemical composition of Fe-Mn nodules and host bottom sediments along the submeridional profile across the Brazil Basin [dataset publication series]. P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, PANGAEA, https://doi.org/10.1594/PANGAEA.786434
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Abstract:
Sedimentation and ore formation were studied in sediments from nine stations located along the 24°W profile in the Brazil Basin of the Atlantic Ocean. Bottom sediments are represented by mio- and hemipelagic muds, which are variably enriched in hydrothermal iron and manganese oxyhydroxides. As compared to bottom sediments from other basins of the Atlantic Ocean, the sediments in study are marked by extremely high manganese contents (up to 1.33%) and maximal enrichment in Ce. It was shown that the positive Ce anomaly is related to REE accumulation on iron oxyhydroxides. Influence of hydrothermal source leads to decrease of Ce anomaly and LREE/HREE ratio. In reduced sediments preservation of positive Ce anomaly and/or its disappearance was observed after iron and manganese reduction. REE contents were determined for the first time in the Ethmodiscus oozes of the Brazil Basin. Ore deposits of the Brazil Basin are represented by ferromanganese crusts and ferromanganese nodules. Judging from contents of iron, manganese, REE, and other trace elements, these formations are ascribed to sedimentation (hydrogenic) deposits. They are characterized by a notable positive Ce anomaly in the REE pattern. Extremely high Ce content (up to 96% of total REE) was discovered for the first time in the buried nodules (Mn/Fe = 0.88).
Related to:
Dubinin, Alexander V; Rimskaya-Korsakova, Maria N (2011): Geochemistry of rare earth elements in bottom sediments of the Brazil Basin, Atlantic Ocean. Translated from Litologiya i Poleznye Iskopaemye, 2011, 1, 3-20, Lithology and Mineral Resources, 46(1), 1-16, https://doi.org/10.1134/S0024490211010032
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: -16.230972 * Median Longitude: -24.036824 * South-bound Latitude: -25.595000 * West-bound Longitude: -24.076667 * North-bound Latitude: -2.985000 * East-bound Longitude: -24.018333
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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3 datasets
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Datasets listed in this publication series
- Dubinin, AV; Rimskaya-Korsakova, MN (2011): (Table 2) Chemical composition of bottom sediments in the submeridional profile across the Brazil Basin. https://doi.org/10.1594/PANGAEA.786430
- Dubinin, AV; Rimskaya-Korsakova, MN (2011): (Table 3) Contents of chemical elements leached during treatment by 1M NH2OHxHCl + 25% CH3COOH from bottom sediments of the Brazil Basin. https://doi.org/10.1594/PANGAEA.786431
- Dubinin, AV; Rimskaya-Korsakova, MN (2011): (Table 4) Contents of chemical elements and their ratios in ferromanganese nodules and crust from the Brazil Basin. https://doi.org/10.1594/PANGAEA.786433