The geochemistry of loveringite, a uranium-rare-earth-bearing accessory phase from the Jimberlana Intrusion of Western Australia

1978 ◽  
Vol 42 (322) ◽  
pp. 187-193 ◽  
Author(s):  
I. H. Campbell ◽  
P. R. Kelly
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Western Australia ◽  
Late Stage ◽  
The Other ◽  
Cr Content ◽  
Accessory Phase ◽  
Olivine Cumulates ◽  
Strong Depletion

SummaryThe distribution and geochemistry of loveringite, an accessory Ti, Fe±Cr oxide containing U and rare-earth elements (Ln) from the Jimberlana Intrusion, have been studied. Loveringite is most abundant in bronzite cumulates; it is found in trace amounts in early plagioclase-augite-hypersthene cumulates, but is not found in the olivine cumulates or in the late-stage differentiates. Loveringites from the bronzite cumulates have a high Cr content compared with those from the plagioclase-augite-hypersthene cumulates, suggesting that the mineral is stabilized by the presence of Cr in the intercumulus liquid. The Ln pattern shows a strong depletion trend from La to Eu, a sharp reversal between Eu and Tb and a second depletion pattern from Tb to Lu. This pattern suggests that the Ln are substituting into two sites, one much larger than the other.

Reductive Dissolution of a Lateritic Ore Containing Rare Earth Elements (REE) Using Acidithiobacillus Species

2017 ◽  
Vol 262 ◽  
pp. 299-302
Author(s):  
Ivan Nancucheo ◽  
D. Barrie Johnson ◽  
Manoel Lopes ◽  
Guilherme Oliveira
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineral Dissolution ◽  
The Other ◽  
Reductive Dissolution ◽  
Valuable Metals ◽  
Lateritic Ore

Lateritic deposits containing rare earth elements (REE) are important resources in Brazil, where monazite is the main REE-bearing mineral and is frequently associated with iron hydroxy-oxides and quartz. In order to recover valuable metals such as REE and uranium, experiments were carried out under reductive mineral dissolution using Acidithiobacillus species. In terms of phosphate, aerobic reductive dissolution at pH 0.9 using A. thiooxidans extracted about 35% of that present in the ore which is and indicator of the dissolution of monazite. Although only ~9% of the cerium and 5% of the lanthanum were extracted, ~72% of the uranium was solubilized, indicating that it was more susceptible to extraction by reductive dissolution than the other two REE.

U–Pb garnet and titanite age for the Bristol Township lamprophyre suite, western Abitibi Subprovince, Canada

1990 ◽  
Vol 27 (11) ◽  
pp. 1451-1456 ◽  
Author(s):  
C. Tucker Barrie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fault Zone ◽  
Late Stage ◽  
Gold Mineralization ◽  
Light Rare Earth ◽  
Upper Limit ◽  
Abitibi Subprovince ◽  
Brittle Fractures ◽  
Light Rare Earth Elements

A U–Pb age of 2687 ± 3 Ma has been determined for a garnetite dike, using melanite garnet and titanite mineral separates. This is the first primary igneous U–Pb age reported using garnet. The garnetite dike is part of the Bristol Township lamprophyre suite, which is extremely enriched in large-ion lithophile elements and light rare earth elements and which is located within the Destor Porcupine fault zone of the western Abitibi Subprovince. The age represents an upper limit for late-stage gold mineralization found along brittle fractures that cut the lamprophyre suite and it coincides with regional transpression documented in several locations in the southern Superior Province.

scholarly journals Distribution, fractionation and sources of rare earth elements in suspended particulate matter in a tropical agricultural catchment, northeast Thailand

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10853
Author(s):  
Kunhua Yang ◽  
Guilin Han ◽  
Jie Zeng ◽  
Wenxiang Zhou
Keyword(s):  
Rare Earth ◽  
Particulate Matter ◽  
Rare Earth Elements ◽  
Suspended Particulate Matter ◽  
The Other ◽  
Mekong River ◽  
Northeast Thailand ◽  
Eu Anomaly ◽  
Suspended Particulate ◽  
The Relationship

Forty-eight suspended particulate matter (SPM) samples were collected from the Mun River, northeast Thailand and its junction with the Mekong River, to investigate the relationship between the distribution of rare earth elements (REE) in SPM and the soils in the watershed. The total REE contents (∑REE) in SPM in the Mun River ranged from 78.5 to 377.8 mg/kg with the average of 189.3 mg/kg, which was lower than ∑REE of 222.3 mg/kg at the Mekong River (one sample at junction). The Post Archean Australia Shale (PAAS)-normalized ratios of light REE (LREE), middle REE (MREE) and heavy REE (HREE) were averaged to 1.0, 1.3 and 1.0, which showed a clear enrichment in MREE. In short, along the Mun River, the REE contents in SPM were decreasing, and the PAAS-normalized patterns of REE showed gradually flat. The REE content in SPM and soils are highest in the upper catchment, indicating that soil/bedrock is the most important source of REE in SPM. Additionally, the positive Eu anomaly was enhanced by the higher Ca content in SPM (R = 0.45), which may be caused by more feldspars or carbonates with Ca and Eu substituting Ca. The results present the REE behaviors of SPM in the Mun River and relationship between REE in SPM and soil/bedrock, the findings may support the other studies in catchment weathering.

scholarly journals Initial Study for Cerium and Lanthanum Extraction from Bangka Tin Slag through NaOH and HClO4 Leaching

2019 ◽  
Vol 269 ◽  
pp. 07003 ◽  
Author(s):  
Badrul Munir ◽  
Sulaksana Permana ◽  
Anggita Amilia ◽  
Ahmad Maksum ◽  
Johny W Soedarsono
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Initial Study ◽  
The Other ◽  
Water Quenching ◽  
Other Hand ◽  
Global Demand ◽  
Tin Slag

The global demand for rare earth elements have increased dramatically for the last decade as more and more devices use rare earth elements as key for their advanced properties. The paper explores the possibilty to recover cerium (Ce) and lanthanum (La) in Bangka tin slag (BTS) involving roasting at 900°C, water-quenching, and two leachings, 8M NaOH leaching and HClO4 leaching at concentrations of 0.1M, 0.4M, and 0.8M. HClO4 leaching causes Ce and La contents to decrease to 0.47% for 0.1M, 0.51% for 0.4M, and 0.59% for 0.8M. On the other hand, 8M NaOH optimizes cerium and lanthanum contents up to 4.35% and 1.45%, respectively.

scholarly journals Ree and Sr-Nd Isotope Compositions of Clinopyroxenites, Phoscorites and Carbonatites of the Seblyavr Massif, Kola Peninsula, Russia

Mineralogia ◽  
2007 ◽  
Vol 38 (1) ◽  
pp. 29-45 ◽  
Author(s):  
Elena Balaganskaya ◽  
Hilary Downes ◽  
Daniel Demaiffe
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Kola Peninsula ◽  
Mantle Source ◽  
Upper Mantle ◽  
Late Stage ◽  
Narrow Range ◽  
Nd Isotope ◽  
Single Batch ◽  
Mineral Accumulation

Ree and Sr-Nd Isotope Compositions of Clinopyroxenites, Phoscorites and Carbonatites of the Seblyavr Massif, Kola Peninsula, RussiaClinopyroxenites, phoscorites and carbonatites from the Devonian Seblyavr intrusion (Kola Peninsula, Russia) have petrographic characteristics indicating that they are accumulative in origin. Their geochemical (major and rare earth elements) compositions can be accounted for by mixtures of their major rock-forming minerals and accessory phases, i.e. they reflect the record of mineral accumulation. All of the analysed Seblyavr rocks are strongly LREE-enriched with (La/Yb)N mostly ranging from 38 to 189. However, a dolomite carbonatite with hydrothermal LREE-Sr mineralization has an extreme (La/Yb)N value of 1659. Such late-stage dolomite carbonatites were formed by hydrothermal (rather than magmatic) processes. Whole-rock samples of representative magmatic lithologies from Seblyavr have initial 87Sr/86Sr and εNd that fall in a very narrow range from 0.7031 to 0.7033 and +4.9 to +5.9, respectively. We therefore conclude that clinopyroxenites, phoscorites and carbonatites were formed by differentiation and crystallization of a single batch of melt. The parental melt was derived from a depleted upper mantle source that had been meta-somatised prior to melting.

Chemical Migration by Contact Metamorphism between Pegmatite and Country Rocks: Natural Analogs for Radionuclide Migration

1983 ◽  
Vol 26 ◽  
Author(s):  
J. C. Laul ◽  
R. J. Walker ◽  
C. K. Shearer ◽  
J. J. Papike ◽  
S. B. Simon
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
South Dakota ◽  
Trace Element ◽  
Black Hills ◽  
The Other ◽  
Contact Metamorphism ◽  
Relative Degree ◽  
Radionuclide Migration ◽  
Other Hand

ABSTRACTComparison of trace element signatures of country rocks as a function of distance from the contact with two pegmatites, Tin Mountain and Etta, in the Black Hills of South Dakota, suggests that some elements such as K, Li, Rb, Cs, As, Sb, Zn and Pb, have migrated to distances of 4 to 40 meters during contact metamorphism. The relative degree of migration varies depending on the element. On the other hand, there is virtually no migration of rare earth elements (REE), Al, Sc, Cr, Hf, U, and Th. Biotite and muscovite are effective trace element traps for Li, Rb and Cs. Biotite has a greater affinity for Rb, Cs and Li than muscovite.

B1 subdivisions in thin komatiites at Kambalda, Western Australia

1989 ◽  
Vol 126 (3) ◽  
pp. 263-270 ◽  
Author(s):  
B. Thomson
Keyword(s):  
Western Australia ◽  
Late Stage ◽  
Lateral Position ◽  
Total Thickness ◽  
Olivine Cumulates ◽  
High Degree ◽  
Peripheral Regions

AbstractB1 subdivisions are narrow foliated zones of stubby, skeletal olivine blades, situated at the top of the granular olivine cumulates (B2) in ponded komatiite lavas. They developed at a late stage in pond crystallization as a result of compaction-related circulation of intercumulus liquids through and along the top of the cumulates. The total thickness of a B1 and its degree of blade parallelism are related to lateral position within ponded lavas. The deeper, hotter and longer-lived core regions generated a thick B1 with a high degree of blade parallelism (ordered B1), whereas the shallower, peripheral regions produced a narrow B1 with a poor degree of blade parallelism (disordered B1), or failed to develop one at all.

Separation of scandium from the other rare earth elements with a novel macro-porous silica-polymer based adsorbent HDEHP/SiO2-P

2019 ◽  
Vol 185 ◽  
pp. 117-124 ◽  
Author(s):  
Wei Zhang ◽  
Shuqi Yu ◽  
Shichang Zhang ◽  
Jie Zhou ◽  
Shunyan Ning ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Porous Silica ◽  
The Other

scholarly journals The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 73 ◽  
Author(s):  
Evgeniy Kozlov ◽  
Ekaterina Fomina ◽  
Mikhail Sidorov ◽  
Vladimir Shilovskikh ◽  
Vladimir Bocharov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Late Stage ◽  
Rock Type ◽  
Ti Oxides ◽  
Metasomatic Event

The Vuoriyarvi Devonian carbonatite–ijolite–pyroxenite–olivinite complex comprises several carbonatite fields: Neske Vara, Tukhta-Vara, and Petyayan-Vara. The most common carbonatites in the Tukhta-Vara and Neske-Vara fields are calciocarbonatites, which host several P, Fe, Nb, and Ta deposits. This paper focuses on the Petyayan-Vara field, in which the primary magmatic carbonatites are magnesian. The least altered magnesiocarbonatites are composed of dolomite with burbankite and are rich in REE (up to 2.0 wt. %), Sr (up to 1.2 wt. %), and Ba (up to 0.8 wt. %). These carbonatites underwent several stages of metasomatism. Each metasomatic event produced a new rock type with specific mineralization. The introduction of K, Si, Al, Fe, Ti, and Nb by a F-rich fluid (or fluid-saturated melt) resulted in the formation of high-Ti magnesiocarbonatites and silicocarbonatites, composed of dolomite, microcline, Ti-rich phlogopite, and Fe–Ti oxides. Alteration by a phosphate–fluoride fluid caused the crystallization of apatite in the carbonatites. A sulfate-rich Ba–Sr–rare-earth elements (REE) fluid (probably brine-melt) promoted the massive precipitation of ancylite and baryte and, to a lesser extent, strontianite, bastnäsite, and synchysite. Varieties of carbonatite that contain the highest concentrations of REE are ancylite-dominant. The influence of sulfate-rich Ba-Sr-REE fluid on the apatite-bearing rocks resulted in the dissolution and reprecipitation of apatite in situ. The newly formed apatite generation is rich in HREE, Sr, and S. During late-stage transformations, breccias of magnesiocarbonatites with quartz-bastnäsite matrixes were formed. Simultaneously, strontianite, quartz, calcite, monazite, HREE-rich thorite, and Fe-hydroxides were deposited. Breccias with quartz-bastnäsite matrix are poorer in REE (up to 4.5 wt. % total REE) than the ancylite-dominant rocks (up to 11 wt. % total REE).

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