Sorption of the 14 Rare Earth Elements (REE) by basaltic rock is investigated as a function of pH, ionic strength and aqueous REE concentrations. The rock sample, originating from a terrestrial basalt flow (Rio Grande do Sul State, Brazil), is composed of plagioclase, pyroxene and cryptocrystalline phases. Small amounts of clay minerals are present, due to rock weathering. Batch sorption experi...

REE (rare earth element) distribution coefficients (Kd) between the aqueous phase and montmorillonite surface were obtained to investigate the relation between the REE distribution patterns and the species of REE sorbed on the solid-water interface. It was shown that the features in the REE patterns, such as the slope of the REE patterns, the tetrad effect, and the Y/Ho ratio, were closely rela...

As an emerging contaminant, rare earth elements (REEs) are becoming environmental concern, especially in Chinese cities. This study investigated the distribution of REEs river water and tap samples Guiyang, Southwest China. In all samples, concentrations total dissolved REE (∑REE) ranged from 15.1 to 53.3 ng·L–1, with heavy enriched than light elements. Most showed significant positive Gd anoma...

Rare earth elements (REEs) have become increasingly important metals used in modern technology. Processes including mining, oil refining, discarding of obsolete equipment containing REEs, and the use of REE-containing phosphate fertilizers may increase the likelihood of environmental contamination. However, there is a scarcity of information on the toxicity and accumulation of these metals to t...

Temporal variations of rare earth elements (REE) and their fractionation patterns, major elements, Pb Hg were determined in two multicores collected at 445 2100 m water depth (mwd) the Cascais submarine canyon (CSC). The PAAS-normalized REE patterns suggest mixing Tagus estuarine marine sediments, marked by MREE (Nd?Dy series) enrichment positive Eu-anomaly, with sediments. Eu/Eu* implies incor...

The redox-sensitive geochemical behavior of uranium permits the use of Th/U ratios as a geochemical proxy for the oxidation state of the atmosphere and oceans during sedimentary processes. Due to the effects of post-depositional uranium mobility on Th/U ratios during events involving oxygenated fluids, direct measurements of Th/U ratios are often misleading, but the whole rock Pb isotope compos...

The geochemistry of rare earth element (REE) variations in acid waters is being studied as part of the U. S. Geological Survey Abandoned Mine Lands Initiative in two pilot watersheds, upper Animas, Colorado and Boulder, Montana. The following objectives are under investigation: (1) comparison of acid mine waters and naturally acidic springs, (2) determination of whether the dominant control on ...

The Proterozoic Athabasca Basin hosts a large number of high-grade, large-tonnage unconformity-related uranium (U) deposits, many which are also enriched in rare earth elements (REE). basin contains hydrothermal REE mineralization unassociated with U. Previous studies postulated that U and were derived from either the or basement; however, exact source metals remains ambiguous. This study provi...

In the Jebilet massif (Variscan belt, Morocco), two peraluminous granodioritic plutons (the Eastern and Central plutons) are spatially associated with a regional shear zone. The pluton includes Tabouchent, Bramram Bamega intrusions, which represent variably eroded portions of an arcuate apical part pluton. intrusions composed biotite ± cordierite-bearing granodiorite that is crosscut by tourmal...