Revisit of rare earth element fractionation during

Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarifiion. We investigated the REE fractionations during chemical weathering and river sediment transport based on the systematic observations from a

Rare earth and yttrium phosphate solubilities in aqueous

The precipitates were washed with 0.1 mol dm3 HC104 and with deionized water to eliminate any traces of carbonate. 1625 2.2. XRay Diffraction Analysis of Rare Earth Phosphates Rare earth phosphate precipitates from each procedure were exam ined by Scintag XRD immediately prior to their use in solubility analyses.

Geochemical Evidence for RareEarth Element Mobilization

Mar 06, 2018 · Rareearth element geochemistry signatures are particularly useful for tracking element sources and mobility and are, therefore, powerful tools in the investigation of clay mineral formation and diagenesis. Rareearth element and bulk chemical compositions were determined using discrete chemical analyses and chemical imaging.

Fractionations of rare earth elements in plants and their

Fractionations of rare earth elements (REEs) and their mechanisms in soybean were studied through appliion of exogenous mixed REEs under hydroponic conditions. Significant enrichment of middle REEs (MREEs) and heavy REEs (HREEs) was observed in plant roots and leaves respectively, with slight fractionation between light REEs (LREEs) and HREEs in stems. Moreover, the tetrad effect was

Rare earth, major, and trace elements in chert from the

Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indie that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater.

A review of fractionations of rare earth elements in plants

Studies were carried out on several aspects of rare earth elements (REEs), such as the theory and practice of their appliions in agriculture, their geochemical behaviors in natural and agricultural ecosystems, the mechanisms for the increase of crop yield using REE fertilizer, and their toxicology.

Controls on the distribution and fractionation of yttrium

Mineralogy, major elements (Fe, Mn and Al), rare earths and yttrium (REY) of bulk sediments were analyzed in four gravity cores recovered along the main channel of the Mandovi estuary, western India, to determine the sources and controls on REY distribution. The accelerator mass spectrometer (AMS) ages of total organic carbon indied modern age for the sediments of the upper estuary and

Interoceanic variation in the rare earth, major, and trace

Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indie that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater.

(PDF) Rare earth element fractionations of the

Rare earth elements (REEs) fractionations in siliciclastic marine sediments are related to the parent rock properties, weathering degree, grain size, and heavy minerals. The relations between

Rare earth element patterns of the Central Indian Basin

Rare earth element (REE) concentrations have been determined in terrigenous, siliceous (nodule barren and nodule bearing), calcareous, and red clay from the Central Indian Basin. The bulk distribution of REE, and in particular the relative cerium fractionation, in these surface sediments has been studied in relation to bottom water conditions. REE fractionations within a single depositional

A review of fractionations of rare earth elements in

Available online at com ScienceDirect JOURNAL OF RARE EARTHS ELSEVIER JOURNAL OF RARE EARTHS, 26 (2008) 715 com A review of fractionations of rare earth elements in plants LIANGTao (MS W) DING Shiming (TJ)2, SONGWenchong Cfefcfl1)1, CHONG Zhongyi (0<!&X) ZHANG Chaosheng (ffc$8, LI Haitao &MW) xi (1.

Chemical element Major components Britannica

Chemical fractionations taking place during the evolution of igneous rocks from primordial matter have clearly modified this basic relationship. The odd–even relationship is most prominent in the rareearth elements (atomic numbers 57–71), which are chemically so similar that they are little fractionated by geochemical processes.

Rare Earth Element and Trace Element Features of Gold

These are obvious LREE fractionations. The rare earth element (REE) distribution patterns show obvious Eu anomaly with average δEu values of 0.664, and δCe anomalies of 1.044. REE characteristics are similar to those of wall rocks (regional metamorphic rocks), but different from those of the Dexing granodiorite porphyry and Damaoshan biotite

Effectiveness of rare earth elements constrain on

Rare earth elements (REE) have been extensively used to indie for material provenance since they behave conservatively and mainly transport in particulate form during earth surface processes. Nevertheless, the appliion of REE for material provenance study has to be cautious because grain size and mineral fractionations can alter bulk compositions of weathered sediments. Central Asia is

Rare earth element concentrations and Nd isotopes in the

may cause fractionations within the group. The resulting dissolved PAASnormalized REE patterns illustrate typical openocean features like heavy rare earth enrichment relative to the light ones and a

The effect of diagenesis and fluid migration on rare earth

limited data on the distribution of rare earth elements (REEs) in pore fluid. REEs comprise a set of elements with very similar chemical properties. However, the progressive filling of shielded 4forbital with increasing atomic number throughout the series leads to slight fractionations in their relative concentrations in natural systems.

Condensation and fractionation of rare earths in the solar

Condensation and fractionation of rare earths in the solar nebula indiing a complex history for these inclusions, and that the undeniable gassolid fractionations that produced the REE patterns may have taken place under somewhat more reducing conditions ior of the rare earths and suggested a

Rare earth element content of cryptocrystalline magnesites

Differences in rare earth element (REE) relative fractionations and total abundances in marine cherts and shales reflect the depositional loion of the sediments. Based on cerium anomaly (Ce/Ce{asterisk}) and total REE abundance ({Sigma}REE) variations preserved in interbedded chert and shale sequences of the Franciscan assemblage, the

A review of fractionations of rare earth elements CORE

Abstract. Studies were carried out on several aspects of rare earth elements (REEs), such as the theory and practice of their appliions in agriculture, their geochemical behaviors in natural and agricultural ecosystems, the mechanisms for the increase of crop yield using REE fertilizer, and their toxicology.

Accumulation and fractionation of rare earth elements are

Rare earth elements (REEs) are now considered emerging pollutants in the environment. Phytolacca americana, an REE hyperaccumulating plant, has been proposed for the remediation of REE

Rare earth elements (REEs) in shallow and deep water

Through time, oceans have experienced physicochemical variations in a response to the evolution of the earth and its atmosphere. Geochemical proxies are employed to define these variations, evaluate their magnitudes and identify the responsible factors. Because of the unique behavior of the rare earth elements (REEs) within the oceanic system, they have been proven to be a leading proxy for

Controls on the distribution and fractionation of yttrium

Abstract. Mineralogy, major elements (Fe, Mn and Al), rare earths and yttrium (REY) of bulk sediments were analyzed in four gravity cores recovered along the main channel of the Mandovi estuary, western India, to determine the sources and controls on REY distribution.

Quaternary International Journal ScienceDirect

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Revisit of rare earth element fractionation during

Abstract Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarifiion. We investigated the REE fractionations

Dysprosium – Hastings Technology Metals Limited

It occurs in the Earth''s crust at an average concentration of 3 parts per million(ppm). Xenotime is enriched in dysprosium oxide and contains 8% to 9% of the rareearth oxide (REO) content. Monazite(Ce), which is more abundant in the Earth''s'' crust than xenotime, has dysprosium oxide contents of 0.2% to 0.9% of the REO content.

Fractionation Mechanisms of Rare Earth Elements (REEs) in

Mar 16, 2006 · Fractionations of rare earth elements (REEs) in wheat (Triticum aestivum L.) were observed through appliion of exogenous mixed REEs under hydroponic conditions. Middle REE (MREE), light REE (LREE), and heavy REE (HREE) enrichments were found in roots, stems, and leaves, respectively, accompanied by the tetrad effect (an effect that can cause a split of REE patterns into

(PDF) Revisit of rare earth element fractionation during

Revisit of rare earth element fractionation during chemical weathering and river sediment transport Article (PDF Available) in Geochemistry Geophysics Geosystems · February 2017 with 675 Reads

Isotopic fractionation of rare earth elements in

The isotopic composition of Rare Earth Elements(REEs) can be fractionated through various physical and chemical reactions in nature [1]. The isotopic variations of REEs occurring naturally has a potentially significant influence in geochemical research fields. The REEs has key features that their chemical similarities and gradual changes of ionic radius, which may help us to understand the

Role of ligands in accumulation and fractionation of rare

Abstract. Few studies have been carried out on the effects of ligands on rare earth element (REE) bioaccumulation processes. In this study, the effects of phosphate (Pi, an inorganic ligand) and citrate (an organic ligand) on accumulation and fractionation of REEs in wheat were investigated using aqueous culture with extranous mixed REEs (MRE).

Recent Quaternary International Articles Elsevier

CiteScore: 2.19 ℹ CiteScore: 2018: 2.190 CiteScore measures the average citations received per document published in this title. CiteScore values are based on citation counts in a given year (e.g. 2015) to documents published in three previous calendar years (e.g. 2012 – 14), divided by the number of documents in these three previous years (e.g. 2012 – 14).