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rare earth fractionation

(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 648 Reads

Unusual rare earth element fractionation in a tin-bearing ...

Unusual rare earth element fractionation in a tin-bearing magmatic- hydrothermal system Thomas Monecke 1 *, Ulf Kempe 2, Michael Trinkler 3, Rainer Thomas 4, Peter Dulski 4, and Thomas Wagner 5

Distribution and fractionation of rare earth elements and ...

Abstract. Concentrations of rare earth elements (REE) and yttrium (Y), and major metals (Al, Fe and Mn) were measured in suspended particulate matter (SPM) and bottom sediments of the Kali estuary, western India, for their distribution and fractionation.

(PDF) Rare-earth element fractionation in uranium ore and ...

Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals Article (PDF Available) in Applied Geochemistry · October 2017 with 294 Reads How we measure 'reads'

Rare Earth - I Know I'm Losing You (full version) - YouTube

Feb 17, 2011· Rare Earth; Writers Norman Whitfield, Cornelius Grant, Edward Holland; Licensed to YouTube by UMG; EMI Music Publishing, LatinAutor - SonyATV, SOLAR Music Rights Management, LatinAutor, CMRRA, BMG ...

Rare-earth element fractionation in uranium ore and its U ...

The REEs patterns of the alteration and ore for the Great Bear Lake are smooth ; however, the ore/alteration pattern displays spikes in the heavy rare-earths . These spikes cannot be explained solely by simple light rare-earth fractionation into U(VI) secondary minerals.

Rare earth element fractionation in metamorphogenic ...

— (subm) Note on the aqueous geochemistry of the rare-earth elements: Comments on "The aqueous geochemistry of the rare-earth elements and yttrium. 2. Theoretical predictions of speciation in hydrothermal solutions to 350°C at saturation water vapor …

Condensation and fractionation of rare earths in the solar ...

the rare earth elements (REE) when compared to Cl chondrites. Tanaka and Masuda proposed that the fractionated rare earth patterns were formed by in- complete volatilization of dust followed by fractional condensation, although they did not attempt to model the process in detail.

Mobility and fractionation of rare earth elements during ...

The rare earth elements (REE) have been mobilised and fractionated during supracrustal alteration of the Torrongo granodiorite. Compared with the parent granodiorite, incipiently and moderately ...

Rare earth element fractionation and concentration ...

Read "Rare earth element fractionation and concentration variations along a groundwater flow path within a shallow, basin-fill aquifer, southern Nevada, USA, Geochimica et Cosmochimica Acta" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Fractionation characteristics of rare earth elements (REEs ...

engers of rare earth elements (REEs) in soils and thus affect geochemical behavior and occurrence of REEs. The fractionation of REEs is a common geochemical phe-nomenon in soils but has received little attention, espe-cially fractionation induced by secondary minerals. In this study, REEs (La to Lu and Y) associated with soil-abun-

(PDF) Rare-earth fractionation and magmatic processes

Rare earth element (REE) fractionation trends in feldspars are reported from Olympic Dam (including Wirrda Well and Phillip's Ridge) and Cape Donington (Port Lincoln), for comparison with two ...

Rare-earth element fractionation in uranium ore and its U ...

@article{osti_1416495, title = {Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals}, author = {Balboni, Enrica and Spano, T and Cook, N and Simonetti, A and Burns, P C}, abstractNote = {We developed a cation exchange chromatography method employing sulfonated polysterene cation resin (DOWEX AG50-X8) in order to ...

Rare earth element distributions and fractionation in ...

Rare earth element (REE) concentrations were measured for the first time in plankton from the northwestern Mediterranean Sea. The REE concentrations in phytoplankton (60–200 μm) were 5–15 times higher than those in four size fractions of zooplankton: 200–500 μm, …

(PDF) Mobility and fractionation of rare earth elements ...

Mobility and fractionation of rare earth elements during supergene weathering and gossan formation and chemical modification of massive sulfide gossan. Geochimica et Cosmochimica Acta, 2006. Matthew Leybourne. Jan Peter. D. Layton-matthews. John Volesky. Daniel Boyle. Matthew Leybourne. Jan …

Fractional Precipitation of Rare Earths with Phosphoric Acid

FRACTIONAL PRECIPITATION OF RARE EARTHS WITH PHOSPHORIC ACID By M. K. CARRON, C. R. NAESER, H. J. ROSE, JR., and F. A. HlLDEBRAND ABSTRACT A study of the fractional precipitation of the phosphates of pairs of adjacent and some nonadjacent rare-earth elements was made by means of wet-chemical, spectrographic, and X-ray powder diffraction techniques.

Fractionation of Rare Earth Elements in Greisen and ...

This study focuses on concentrations and fractionation of rare earth elements (REE) in a variety of minerals and bulk materials of hydrothermal greisen and vein mineralization in Paleoproterozoic monzodiorite to granodiorite related to the intrusion of Mesoproterozoic alkali- and fluorine-rich granite. The greisen consists of coarse-grained quartz, muscovite, and fluorite, whereas the veins ...

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 clarification.

Fractionation of rare earth and other trace elements in ...

Fractionation of rare earth elements (REE) and other trace metal concentrations (Th, U, Cd, Cr, Cu, Ni, Pb, and Zn) between mangrove sediments and claw muscles and shells of male crabs (Ucides cordatus) from a subtropical estuary highly impacted by fertilizer industry activities was investigated.This is the first record of REE distribution in these organisms, and the results showed higher ...

Rare-earth element fractionation in uranium ore and its U ...

Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals Article (PDF Available) in Applied Geochemistry · October 2017 with 294 Reads How we measure 'reads'

Revisit of rare earth element fractionation during ...

RESEARCH ARTICLE 10.1002/2016GC006659 Revisit of rare earth element fractionation during chemical weathering and river sediment transport Ni Su 1, Shouye Yang, Yulong Guo 1, Wei Yue, Xiaodan Wang, Ping Yin2,3, and Xiangtong Huang 1State Key Laboratory of Marine Geology, Tongji University, Shanghai, China, 2Key Laboratory of Marine Hydrocarbon Resources and Environmental …

Thulium anomalies and rare earth element patterns in ...

Dauphas, N & Pourmand, A 2015, ' Thulium anomalies and rare earth element patterns in meteorites and Earth: Nebular fractionation and the nugget effect ', …

Rare Earth Elements: Their Importance in Understanding ...

The rare earth elements (REEs) are commonly defined as lanthanum (La) and the 14 elements comprising the Lanthanide series. The REE's typically exhibit trivalent oxidation states; however, Europium may also occur as Eu2+ and Cerium may occur as Ce4+. The REE's ionic radii decrease on progression from La to Lu, which results in a slight but predictable change in their chemical affinity.

High field strength element/rare earth element ...

U and Th also have higher partition coefficients at higher garnet Ca contents, while the amount of fractionation between the two decreases. In contrast, the heavy rare earth element partition coefficients D HREE are hardly affected by a change in garnet Ca content. We provide a semiquantitative explanation for the behavior of the high field ...

Apatite Replacement and Rare Earth Mobilization ...

Light rare earth elements released from allanite early in weathering apparently combined with P released by leaching of primary apatite to form secondary phases exhibiting a range of morphologies and compositions. Chondrite normalized fractionation patterns La > Nd > Sm > Ce; La > Ce > Nd ≥ Sm and La = Sm = Nd > Ce were identified.

Rare-earth element fractionation in uranium ore and its U ...

Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals Enrica Balbonia,b,∗, Antonio Simonettia, Tyler Spanoa, Nathaniel D. Cooka, Peter C. Burnsa,c a Department of Civil and Environmental Engineering and Earth Science, University of Notre Dame…

Rare-earth element - Wikipedia

In geochemistry, rare-earth elements can be used to infer the petrological mechanisms that have affected a rock due to the subtle atomic size differences between the elements, which causes preferential fractionation of some rare earths relative to others depending on the processes at work.

Rare Earths As A Pollution Tracer In China | Science Trends

Jul 26, 2019· His research interests include trace metal fractionation and particularly critical elements (rare earth elements, cobalt, vanadium) in low-temperature aqueous systems, a better understanding of trace metal cycles in natural waters, and an improved knowledge of trace metals mobility from rock to soils and vegetation in the critical zone.

Evaluating the fractionation of ion-adsorption rare earths ...

The fractionation of ion adsorption rare earths (IAREs) along the depth in a shaft of a deposit at Dajishan, Jiangxi, China was comparatively evaluated using the partition values (PVs) and relative fractionation values (RFVs) of the leached rare earths (REs).

Diverse fractionation patterns of Rare Earth Elements in ...

Oct 23, 2019· Rare earth elements (REEs) were studied in groundwater in fractures at depths between 144 m and 450 m in Proterozoic granitoids on the Baltic Shield at a coastal site in south eas