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• W1999978958 abstract "Abstract. Sediments collected from hypersaline and anoxic deep-sea basins in the eastern Mediterranean (Thetis, Kryos, Medee, and Tyro) were characterised in terms of their mineralogical composition, the distributions of rare earth elements (REE), Zr, and Hf and their content of microbial DNA. We identified two major mineralogical fractions: one fraction of detritic origin was composed of quartz, gypsum, and low-Mg calcite bioclasts (with 0 < Mg < 0.07%) and another fraction of authigenic origin constituted of halite, dolomite, high-Mg calcite (with a Mg content of up to 22%) and rare bischofite and showed a textural evidence of microbial assemblages. We found that in the Medee and Tyro sediments, the shale-normalised REE pattern of these sediments is strongly enriched in middle REE (MREE), whereas in the Thetis and Tyro basins, a positive Gd anomaly in the residue was obtained after the removal of the water-soluble fraction. In all investigated basins, Y / Ho ratio clustered around chondritic values, whereas Zr / Hf ratio ranged from slightly subchondritic to superchondritic values. Subchondritic Y / Ho and Zr / Hf values were mainly found in the high-Mg carbonate having a microbial origin. The observed preferential removal of Zr with respect to Hf without significant partitioning of Y with respect to Ho indicates that the Zr / Hf ratio and Y–Ho fractionations are influenced by the microbial activity in the sediments. We propose that the concurrent Y-Ho and Zr–Hf fractionations are a suitable tracer of microbial activity in marine sediments." @default.
• W1999978958 created "2016-06-24" @default.
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• W1999978958 date "2014-02-26" @default.
• W1999978958 modified "2023-10-08" @default.
• W1999978958 title "Authigenic phase formation and microbial activity control Zr, Hf, and rare earth element distributions in deep-sea brine sediments" @default.
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• W1999978958 doi "https://doi.org/10.5194/bg-11-1125-2014" @default.
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