scholarly journals Fe-Ti-V ASSOCIADO AO GABRO DE LÍDICE, ESTADO DO RIO DE JANEIRO

2016 ◽  
Author(s):  
Ronaldo Mello Pereira ◽  
Marcelo dos Santos Salomão ◽  
Reiner Neumann ◽  
Paulo Guimarães ◽  
Enrico Pedroso
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Rio De Janeiro ◽  
Chemical Analyses ◽  
Ti Oxides ◽  
Icp Ms ◽  
Opaque Minerals ◽  
Titanium Vanadium ◽  
Janeiro State

ResumoO Gabro de Lídice corresponde a um corpo tabular, com cerca de 4,0 quilômetros de extensão e espessura entre 100 e 200 metros, constituído por hiperstênio, diopsídio, olivina, plagioclásio e minerais opacos (óxidos de Fe e Ti). Assinaturas petrográfica e geoquímica indicam caráter toleítico, entre os campos alcalino e subalcalino. O enriquecimento em V é de 2 a 3 vezes maior do que o clarck esperado para tal tipo de rocha. O principal óxido é a titanomagnetita, com inclusões e exsoluções de ilmenita. O vanádio concentra-se principalmente na titanomagnetita, variando os teores entre 0,68% e 2,07% de V2O5. Análises ICP-MS em pré-concentrado de titanomagnetita forneceram teores de 50,86% de Fe2O3t, 13,56% de TiO2 e 3.721 ppm de vanádio (~ 0,66% de V2O5). Quimicamente a ilmenita tem conteúdo em Fe2O3t (46,75% a 48,80%) e TiO2 (49,99% a 51,36%). Amostras enriquecidas em titanomagnetita exibem valores dos elementos terras raras e traço 30 vezes inferiores aos observados nas demais amostras. Ao longo de todo o corpo, a susceptibilidade magnética varia em escala centimétrica a decimétrica e está associada a concentrações anômalas de titanomagnetita na rocha, o que pode representar um bandamento magmático. Os dados apresentados sugerem uma origem associada a ambiente intraplaca.Palavras Chave: Gabro, titanomagnetita, ilmenita, titânio, vanádio.AbstractFe-Ti-V ASSOCIATED WITH LIDICE GABBRO, RIO DE JANEIRO STATE. The Gabbro of Lidice has about 4.0 km in length and thickness between 100 and 200 meters, consisting of pyroxene, olivine, plagioclase and opaque minerals (Fe and Ti oxides). Petrographic and geochemical signatures indicate toleitic character, between the alkaline and subalcalino fields. Vanadium enrichment is from 2 to 3 times higher than the expected clarck for such rock. The main oxide is titanomagnetite, with inclusions and exsolutions of ilmenite. Vanadium (0,68% to 2,07% V2O5) is mainly concentrated in titanomagnetite. ICP-MS analyses in pre-concentrated of titanomagnetite provided levels of 50.86% of Fe2O3t, 13.56% of TiO2 and 3,721 ppm of vanadium (~ 0.66% de V2O5). Chemical analyses of ilmenite show content in Fe2O3t (from 46.75% to 48.80%) and TiO2 (from 49.99% to 51.36%). Samples enriched with titanomagnetite display values of trace and rare earth elements 30 times lower than those observed in other samples. Throughout the gabbro, the magnetic susceptibility varies from centimeter to decimeter scales and is associated with abnormal concentrations of titanomagnetite, which may represent magmatic banding. The data presented may suggest an origin associated with intraplate environment.Keywords: Gabbro, titanomagnetite, ilmenite, titanium, vanadium.

scholarly journals MINERALIZAÇÃO DE Fe-Ti-V ASSOCIADA AO GABRO MARCOS DA COSTA (MIGUEL PEREIRA), ESTADO DO RIO DE JANEIRO

2018 ◽  
Author(s):  
Ronaldo Mello Pereira ◽  
Marcelo Salomão ◽  
Reiner Neumann ◽  
Paulo Guimarães ◽  
Enrico Pedroso
Keyword(s):  
Magnetic Susceptibility ◽  
Rio De Janeiro ◽  
The State ◽  
The Body ◽  
Total Weight ◽  
Chemical Analyses ◽  
Primary Flow ◽  
Basal Portion ◽  
Mineral Concentrations ◽  
Janeiro State

O Gabro Marcos da Costa, localizado em Miguel Pereira, é mais um dos registros de rochas gabroides encontrados no estado do Rio de Janeiro. O corpo tem formato lenticular, 2,7 km2 de área aflorante, é estruturalmente isotrópico e sem presença visível de texturas primárias como a orientação por fluxo ou cumuláticas. Amostras do gabro foram submetidas a análises químicas e medidas de susceptibilidade magnética (SM). Possui caráter toleítico, com trend de enriquecimento em Fe. A ambientação tectônica é do tipo intraplaca e possível geração a partir de magma basáltico de alto-Ti (>3% TiO2). Os teores em TiO2 e V em rocha total são equiparáveis aos encontrados em gabros que encerram mineralizações em Fe-Ti-V. Ilmenita e magnetita, geralmente vanadinífera, são os principais minerais opacos e encontram-se disseminadas na rocha. A composição química da magnetita determinada em MEV-EDS varia de: 90,23% a 98,77% de FeOt, 0,07% a 0,42% de TiO2 e 0,59% a 2,13% de V2O5. Os valores de SM medidos em afloramentos estão entre -0.44 x10-4 a 89.4 x10-4 SI-emu. Em afloramento, por meio dessas medidas de SM, percebe-se a presença de níveis e bandas centimétricas aonde a concentração de minerais ferromagnéticos chega a até 22% em peso e interpretadas como estratificação magmática. As maiores concentrações de minerais ferromagnéticos ocorrem na parte setentrional do corpo aqui considerada como a porção basal da câmara magmática.Palavras Chave: mineralização de Fe-Ti-V, gabro, Rio de Janeiro, magnetita vanadiníferaAbstract:Fe-Ti-V MINERALIZATION ASSOCIATED WITH GABRO MARCOS DA COSTA (MIGUEL PEREIRA), RIO DE JANEIRO STATE. Marcos da Costa Gabbro, located in Miguel Pereira city, is one of the records of gabbroid rocks found in the state of Rio de Janeiro. The body is lenticular shape, with 2.7 km² outcrops, structurally isotropic and without visible presence of primary flow or cumulate textures. Gabbro samples were submitted to chemical analyses and magnetic susceptibility measurements (MS). Its character is toleithic, with trend of enrichment in Fe. The tectonic ambiance is intraplate type, with possible generation from basalt with high-Ti (> 3% TiO2). The TiO2 and V contents are comparable to those found in gabbros containing Fe-Ti-V mineralizations. Ilmenite and magnetite, usually vanadiniferous, are scattered in the rock. The magnetite contents determined in SEM-EDS vary from: 90.23% to 98.77% of FeOt, 0.07% to 0.42% of TiO2 and 0.59% to 2.13% of V2O5. MS values range from -0.44 x10-4 to 89.4 x10-4 SI-emu. Levels and centimeter bands with high MS exhibit ferromagnetic mineral concentrations of up to 22% of total weight and were interpreted as magmatic layering. The highest concentrations of ferromagnetic minerals occur in the northern part of the body here regarded as the basal portion of the magma chamber.Keywords: Fe-Ti-V mineralization, gabbro, Rio de Janeiro, vanadiferous magnetite

Magnetic susceptibility of the selenides of some yttrium-group rare-earth elements

1976 ◽  
Vol 15 (5) ◽  
pp. 394-396 ◽  
Author(s):  
G. V. Lashkarev ◽  
V. P. Fedorchenko ◽  
V. A. Obolonchlk ◽  
I. P. Skripka
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Elements

Geochemical characteristics and geologic significance of rare earth elements in oil shale of the Yan’an Formation in the Tanshan area, in the Liupanshan Basin, China

2021 ◽  
pp. 1-41
Author(s):  
Lianfu Hai ◽  
Qinghai Xu ◽  
Caixia Mu ◽  
Rui Tao ◽  
Lei Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Oil Shale ◽  
Sedimentary Environment ◽  
Moderate Degree ◽  
Material Source ◽  
Icp Ms ◽  
Ree Distribution ◽  
Heavy Rare Earth Elements ◽  
Degree Of Differentiation

In the Tanshan area, which is at the Liupanshui Basin, abundant oil shale resources are associated with coals. We analyzed the cores, geochemistry of rare earth elements (REE) and trace element of oil shale with ICP-MS technology to define the palaeo-sedimentary environment, material source and geological significance of oil shale in this area. The results of the summed compositions of REE, and the total REE contents (SREE), in the Yan'an Formation oil shale are slightly higher than the global average of the composition of the upper continental crustal (UCC) and are lower than that of North American shales. The REE distribution pattern is characterized by right-inclined enrichment of light rare earth elements (LREE) and relative loss of heavy rare earth elements (HREE), which reflects the characteristics of crustal source deposition. There is a moderate degree of differentiation among LREE, while the differences among HREE are not obvious. The dEu values show a weak negative anomaly and the dCe values show no anomaly, which are generally consistent with the distribution of REE in the upper crust. The characteristics of REE and trace elements indicate that the oil shale formed in an oxygen-poor reducing environment and that the paleoclimatic conditions were relatively warm and humid. The degree of differentiation of REE indicates that the sedimentation rate in the study area was low, which reflected the characteristics of relatively deep sedimentary water bodies and distant source areas. The results also proved that the source rock mainly consisted of calcareous mudstone, and a small amount of granite was also mixed in.

Effective procedures for the determination of As, Cd, Cu, Fe, Hg, Mg, Mn, Ni, Pb, Se, Th, Zn, U and rare earth elements in plants and foodstuffs

2018 ◽  
Vol 10 (33) ◽  
pp. 4094-4103 ◽  
Author(s):  
Fernanda Pollo Paniz ◽  
Tatiana Pedron ◽  
Bruna Moreira Freire ◽  
Daiane Placido Torres ◽  
Fábio Ferreira Silva ◽  
...  
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Icp Ms ◽  
International Regulations ◽  
Effective Procedures

There are several international regulations regarding trace elements. The use of ICP-MS for their determination is usually a difficult task, especially when Hg is one of the target elements.

scholarly journals Comparison of the Mineral and Nutraceutical Profiles of Elephant Garlic (Allium ampeloprasum L.) Grown in Organic and Conventional Fields of Valdichiana, a Traditional Cultivation Area of Tuscany, Italy

Biology ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1058
Author(s):  
Stefano Loppi ◽  
Riccardo Fedeli ◽  
Giulia Canali ◽  
Massimo Guarnieri ◽  
Stefano Biagiotti ◽  
...  
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Water Content ◽  
Human Health ◽  
Soluble Sugars ◽  
Allium Ampeloprasum ◽  
Icp Ms ◽  
Essential Trace Elements ◽  
Reference Plant

In the Valdichiana area (Tuscany, Italy) an ancient native landrace of elephant garlic (Allium ampeloprasum L.), locally known as “Aglione della Valdichiana”, has long been cultivated. The aim of this study was to check whether there are differences in the mineral and nutraceutical profiles of the Aglione della Valdichiana cultivated conventionally and organically. Based on the analysis by ICP-MS of a wide array of major, minor, essential, and non-essential trace elements as well as rare earth elements, and the evaluation of the content of polyphenols, flavonoids, antioxidants, soluble proteins, soluble sugars, and starch, as well as the weight and water content, it was concluded that differences in the mineral and nutraceutical profiles of organically and conventionally grown bulbs were very limited. Only a statistically (p < 0.05) higher concentration of Cd (+2620%), Co (+113%), Mn (+55%), Rb (+180%), and Sb (+180%), as well as glucose (+37%) in conventionally cultivated bulbs emerged. Cadmium was the only element slightly higher than in the “reference plant,” but with a negligible risk (three orders of magnitude lower) for human health based on consumption. It is concluded that we failed to find evidence of healthier food or a higher nutraceutical quality for organically cultivated elephant garlic.

Analysis of ultra-low level rare earth elements in magnetite samples from banded iron formations using HR-ICP-MS after chemical separation

2014 ◽  
Vol 6 (15) ◽  
pp. 6125-6132 ◽  
Author(s):  
Wenjun Li ◽  
Xindi Jin ◽  
Bingyu Gao ◽  
Changle Wang ◽  
Lianchang Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Reference Materials ◽  
Chemical Separation ◽  
Banded Iron Formations ◽  
Low Level ◽  
Icp Ms ◽  
Ree Patterns ◽  
Iron Formations

Comparison between the REE data of this work and literature values by Z. S. Yu et al., Sampaio et al., Dulski et al., and Bau et al. in reference materials FER-2 (a) and FER-3 (b) using PAAS-normalized REE patterns.

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