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Rare earth elements in the modern sediments of the Bay of Biscay (France)

机译：比斯开湾（法国）现代沉积物中的稀土元素

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摘要

Particulate rare earth elements (REEs) were measured in modern sediment from the Bay of Biscay. Vertical profiles of total and reactive (ascorbate reducible) REEs have been studied in four contrasted sites ranging at water depth from 150 to 2800 m. The focus is on the coupling between the diagenetic conditions and the behavior of particulate REE. Total REEs fraction appears to be affected by the presence of metal sulphides that may act as an important carrier phase for solid REEs. In sediments where sulphate reduction is weak, the transfer from an unknown previous phase, stable in oxic conditions, to another one associated with sulphides seems to be direct, without mobilization in porewaters. In sediments where greater sulphate reduction occurs, we note the formation of an additional "authigenic" phase. Consequently, a threshold level of dissolved sulphide is a prerequisite for the formation of an additional "authigenic" REEs fraction. No direct relationship between the REE_(asc) profiles and authigenic metal oxides have been observed, indicating that authigenic Fe and Mn oxides do not act as an efficient traps in the sediment. Despite particulate REE are mobile in these sediments, no fractionation of the lanthanide series is observed in relation to the redox conditions.
机译：在比斯开湾的现代沉积物中测量了颗粒稀土元素（REE）。在水深从150到2800 m的四个对比站点中，研究了全部和反应性（抗坏血酸可还原的）稀土元素的垂直剖面。重点是成岩条件与颗粒稀土元素行为之间的耦合。稀土元素的总含量似乎受金属硫化物的影响，而金属硫化物可能是固态稀土元素的重要载体。在硫酸盐还原能力较弱的沉积物中，似乎是直接的，在有氧条件下稳定，从未知的前一相向与硫化物有关的另一相的转移是直接的，而没有在孔隙水中移动。在发生硫酸盐还原作用更大的沉积物中，我们注意到形成了另一个“自生”相。因此，溶解的硫化物的阈值水平是形成另外的“自生” REEs馏分的先决条件。尚未观察到REE_（asc）剖面与自生金属氧化物之间的直接关系，这表明自生Fe和Mn氧化物不能作为沉积物中的有效陷阱。尽管颗粒稀土元素在这些沉积物中是可移动的，但相对于氧化还原条件，未观察到镧系元素的分馏。

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