Questions related to Rare Earth Elements
I observed a positive relationship between Sr and £REEs in my limestone geochemistry, and would like to know if there are other indices which could be used to explain such relationship, as interpretation based on Sr has limitations. Secondly, can I use trace elements ratios like Al/K, Mg/Ca, etc (or weathering indices) be used to provide a clue to paleo-climatic conditions? How can this be achieved?
Q1: In many articles on jadeite and jadeitite(Shi 2008,CÁRDENAS-PÁRRAGA2021, Meng 2016, Abduriyim2017, et al.), scholars draw spider diagram based on trace element data and REE from LA-CIP-MS. But the number of elements in the horizontal coordinate is often different. What is the principle on which this is selected?
Q2： When some of the results of the test are below the detection limit（bdl) , or the corresponding elements are not detected (nd), how should they be reflected in the diagram?
I am based in the UK, can anyone tell me where I can get an ICP-MS calibration standard for
Element - Raw Contaminant Stream (ppm) *** main element required.
Ce - >10000 ***
Dy - 49 ***
Er - 22
Eu - 49
Gd - 127
La- >10000 ***
Lu - 10
Nd - 2162 ***
Pr - 330 ***
Sc - <1
Sm - 150
Tb - 5 ***
Tm - 1
Y - 240
Dear science community!
I need your help, please!
I`m totally disapointed and at a loss!
In 2020 (at the end of October) there were the IOP Conference Series: Materials Science and Engineering (ICoSiET 2020). Me and my colegues took part in these conference. As the result (like a result of any other conference) the thesis collection should have been published (at the 4th quarter of the 2020)). Unfortanately, these collection still haven`t publised (despite the fact that 2021 is already at its end).
So, I wonder, if there are anybody, who know something about this situation? Maby there are any of those who also waiting for their thesis?
We have wrote lots of messages to the organizators and the head of the university (in which this conference took place) but they stoped to respond us.
I think this situation shows disrespect for the conference participants. And I believe that such situations should be inlighted in our community!
Thank you, for your attention!
I have a set of cumulate rocks formed by the accumulation of plagioclase and biotite. The proportion of plagioclase is around 55%-60%. However, the whole-rock geochemical data show a strong negative Sr anomaly in the primitive mantle normalized trace element patterns. Any potential interpretations for such a chemical characteristic?
Thank you, guys.
Hi, please help me resolve this doubt! I am doing some sediment studies, and I am analysing trace metals and Rare Earths elements with icp-ms.
Once obtained the concentrations, I don't know how to choose which of the rare earth isotopes is the correct one. Is there a protocol or are there studies in the literature that might indicate this? Thanks in advance!
I am a new researcher in the field of Carbonatite. I have samples from northeastern India I thought it is carbonatite but geochemically it does not show any characteristics of Carbonatite like LREE enrichment and total REE content or (trace element like Ba, Sr).
I didn't get any apatite in petrography but I found spinel, olivine, and tremolite so I think that it might be marble or meta carbonate.
So I need tools to resolve this problem. whether it is carbonatite or not
I am doing a study on REE in some rivers.
To find the relative enrichment of LREE or HREE how should I do.
I did the normal calculation of Sum of LREE/sum of HREE and if the value is greater than 1 it LREE enrichment and Less than 1 HREE. However, I did this simple calculation in the Obtained concentration of data from ICP-MS and I am getting a High LREE enrichment.
The problem I am facing is this is not the case for a normalized pattern where if I do the above calculation it shows HREE enrichment and also the spider plot show the same. I also did some other ratio calculations with normalized data all showing HREE enrichment.
Which should I follow? the normalized data or non-normalized data to find the REE Enrichment of my water samples.
It would also be a kind gesture if anyone can provide me with the equation to calculate the REE enrichment for example for (La/Lu)PAAS.
thank you for your kind consideration
I have geochemical data of sedimentary sequence. From XRD data I got signatures of certain clay minerals like smectite and Kaolinite. But I need the quantitative analysis to find out the percentage of clay from certain sedimentary units. Also, I have XRF and ICP-MS data of the same sequence. Is there any way to get the quantitative clay percentage from major oxides/Trace/ REE?
I am working with REE geochemical data for statistical analysis. I normalized the data with PAAS value and now the question is I wanted to know if enriched in my data LREE or HREE?
1) Should I Divide the LREE concentration obtained from the ICP-MS with the HREE concentration from the ICP-MS or should I do the same division with the PAAS normalized data.
(The Spider plot from PAAS shows HREE enrichment in my data but the ratio of LREE/HREE from the ICP-MS shows LREE enrichment.
2) I have seen some calculated ratios such as La/Yb and It has a flow up the equation
(La/Yb)N = (La/Ybsample) / (La/YbPAAS), although I have never found this equation in any paper that I referred to and wanted to know if anyone knows the equation to calculate the LREE/HREE, LREE/MREE, MREE/HREE enrichment (please kindly mentioned if this calculation is also done using the ICP-MS or the PAAS normalized like the above-mentioned equation.
Thank you for your kind consideration
kindly help me to clear these doubts...
1) How to interpret the sum REE value should I do the Sum of REE with the PAAS normalised data or with the original concentration obtained from the ICP-MS.
2) While doing my research I found much paper which shows pH influence in the REE value but for my area in the Alps region I was not getting any correlation with pH and I been trying to analyse if there any other correlation with other physical parameters such as Ec or even ionic strength but found no luck. I even try cluster and PCA analysis.
3) will it be ok if I conclude my study with the statement no correlation with lithology or these parameters are present in the given samples and further studies with other physical data are required?
I am also attaching my cluster analysis data and PCA analysis data for kind reference
I have bulk rock analysis (trace and rare earth elements) for some granitic plutons and I need to use these analysis to identify the type of alteration. On the other hand I need to know the elements that indicate if the rock is alter or fresh.
I have test samples containing Radium, if i remove the Radium under controlled conditions along with the REE's, is there a cost effective process for the utilisation or disposal of Radium and is it commercially viable?
if its classed a radiative concentrated waste, does anyone have a method and cost for the disposal of Radium in todays world market.
Can you, please, help me to find the information about formation of complex compounds of rare earth elements with chloride anion.
I`m interested particulary the necessary chloride concentration for stable complexes formation.
Thanks a lot!
Can you please tell me if there are anionic sulfate complexes of rare earth elements?
And, if so, can you advise sources where you could read about it.
1. I measured REY concentrations for weathered whole rocks (anorthosite complex, syenitic rocks, metamorphic complex) and each clay fraction extracted therefrom. The results showed good correlation between Eu/Eu* anomaly and total REY concentrations.
2. In addition, diagram of (Th+U)n vs. REY concentrations also showed good correlation.
I want to understand the REY fractionation based on physico-chemical factors such as electrovalence and ionic radii.
I am doing some leaching experiments now on metal-bearing wastes using citric acid as lixiviant. The metals of interest are REE, Co, Mo and V. Is there any specific method for each of them to be precipitated from organic (citrate) PLS? Or are the standard methods (e.g. precipitation of V using ammonia solutions) suitable for organic PLS?
I need to know the particle size for the test, concentration of acid, amount of sample to be tested and the apparatus to be used as well as how to analyze the solution.
I am first time trying to use some REE plots and I am unable to find the equation for obtaining the Sm/Sm* and Nd/Nd*, I have searched in books but not able to find the proper equation.
I was looking for an effective way to remove electrodeposited rare earth elements (REEs) from the substrates. Any suggestions, references will be greatly appreciated! Thanks.
We are working on geochemical analysis of sediments derived from eastern and western ghats of India.
I'm looking for some info/examples that permit me to calculate the detection limit in EDS system. I know the rule that the peak (cps) should be >3(bkg)^1/2, but I'm interested to calculate the ppm amount detectable. Many thx in advantage for help.
I`ve found a lot of articles in which REMs are devided into light, medium and heavy groups, and it`s quite easy, ok. But I still can`t find information about Eu and Gd separation.
Is it possible to divide(without using 100steps extraction and very expensive extragents) so close in properties elements?
And one more question, is it possible to quantify individual REMs in their mixture?
* PMN Primitive mantle normalized
**La and Sm both are usually more incompatible than Yb
For normalizing REE data of fine siliciclastic rocks both PAAS as well as Chondrite values are used. Ideally both would given similar normalized REE pattern. Please suggest me which normalization shall I use and why?
How can separate of rare earth element from a mixture of calcium oxide and rare earth oxide
the calcium is a critical problem which interfere with every methods used for uptake or precipitate of rare earth so if anyone can help me for remove of calcium
thank you so much
Dear professors, I have a question about rare earth elements in the bone repair process. As we all know, rare earth elements like lanthanides are toxic, but I have seen some reports that low concentrations of rare earth elements will promote it to a certain extent The differentiation of osteoblasts and the inhibition of the reproduction of osteoclasts. Is there a certain basis for this statement? Can experiments in this area be tried? Or that rare earth elements are heavy metals and are not beneficial to bone regeneration.
If the professor knows the answer, I hope you can answer it for me. Thank you very much!
Two andesitic samples have significant Tb negative anomaly. The same ones also have Pr negative anomaly which I can explain by a late apatite crystallisation and many apatite inclusions in phenocrysts. I cannot find any information on Tb.
I have to make comments on some plots of geochemical data and I need to get better understanding of how elements get enriched or depleted during crystallization.
I have come across some REE data that seems to show, when correctly normalized, strong positive anomalies in Ce and less so in Nd and Dy and strong negative anomalies in Pr. Later analyses of similar material show smoother normalised distributions. Is this a well known instrumental error? Is there some sort of interference going on?
I am planning to work on the mineralogy of the rock and lateritic soil samples of the Bingo carbonatite complex in order to determine its REE-bearing minerals and determine its REE prospectivity. I would like to know which method I should use to get reliable results. Thanks for your answers.
Textural analysis of zircons is the first step of study that allows selection of targets for geochemical and isotope analysis (Hf isotopes, REE, 18O, etc.), which are necessary to understand geotectonic conditions of its formation and also its inheritance. Could someone want to tell me if the textural study of the core allows us to go so far as to determine if the zircon was detrital before receiving an overgrowth in, for example, a migmatite?
I am currently working in a project on extracting REE from ionic clay sources and wondered whether SPC can be used to determine the process capability of the extraction. For example, plotting recovery rate of 30 trial runs of extraction and calculating Cpk value?
In the hydrothermal system, such as skarn deposit, the garnet always have rhythmic components zonatrion. The major and trace element always different in the adjacent rings. How to explain this phenomenon? even the REE pattens are also changing between different adjacent rings. Why? Impulse type of fluid from the intrusions is enough or some thing alse?
I'm trying to find the partition coefficient for REE in fluorite. There have been a few papers which say they have a Kd value but do not specifically state what it is in the paper. When I go through their references, I can't seem to find the value in those papers either.
I have fluorite from 2 districts and I have done LA-ICP-MS analysis on the fluorite. It is the the goal to try to deduce the REE concentration in the fluid based on the concentration in the fluorite. Does anyone have a good reference on the partition coefficient? I appreciate it.
Can we distinguish primary or metamorphic origin of a mineral based on there REE and trace element pattern ?
I'm searching the following paper, cause I've got no access to this journal!
could you please send me the pdf of this paper?
Rare earth element characteristics and K–Ar ages of the Band Ziarat ophiolite complex, southeastern Iran
A. A. Hassanipak, A. Mohamad Ghazi, J. M. Wampler
I have a solution that contains tributyl phosphate (TBP) and I need to digest it for ICP-OES. I will be looking at rare earth elements (REE). I do not have any experience with TBP and from everything I have read it looks like it may be acid resistant. I do not have access to a perchloric acid hood. Any other suggestions?
After many years of research about synthesis of nanaparticles, it is good to ask a question about what is more promising in the future to guide our research work. My question is: do you think that we need to focus more on metal oxide or metal ferrite composites or we still need to work more on both? Is it better to dope metal oxides and metal ferrites by transition metal or rare earth elements?
How to normalize the REEs to the the shale references (PAAS or NASC)? Is it as simple as dividing the REE value by the reference one?
The occurrence of negative Y anomaly in the chondrite normalized REE patterns in carbonatite is unusual, as Y is isovalent and cannot readily fractionate from its twin Ho in magmatic processes. Rare examples of such Y signatures in carbonatite was reported from the Kalkfeld and Ondurakorume complexes (Bühn 2008).
Hi, All Professors and Researchers.
Unfortunately, there are not accurate analytical facilities in Iran and the budget of my department (Geology division of Urmia University) is frozen to support me for further and detailed analyses. Therefore, I'm looking for research collaborator to carry out ICP-MS, SEM, and EPMA analyses to investigate the behavior of ore-related trace and REE elements on powdered samples. My ph.D thesis is about Sediment hosted copper deposits of NW Iran. Thank you.
The composition of the main elements, trace elements and rare earth elements contained in rocks certainly greatly affects the strength of the rock. Is there a relationship between the chemical composition of rocks exposed to geological structures and rocks that are not exposed to structures?
A reviewer asked me to comment on why the REE are enriched in the magnesiocarbonatite relative to the calcite carbonatite, at Ngualla, Tanzania. My reading around the subject of REE and carbonatites suggest that REE are more concentrated in magnesiocarbonatites and ferrocarbonatites relative to calcite carbonatites, globally; not just at Ngualla. And yet, I have never read an explanation for this association. Can anybody point me in the right direction, please?
I replace the iron ion with a rare earth ion of concentration between 0 and 0.2. The particle size decreased till a concentration 0.12 and then increased again for a concentration 0.2. The synthesis method used is co-precipitation.
Explored the data of rare and rare-earth elements in rocks before-vize (before carbonian era) weathering crust developed by ferruginous quartzites and Bolshetroitsky field. Power paleo weathering crust reaches 300 m at the field for the first time held ICP-MS analysis and highlighted features of iron and iron-aluminum ores. Primarily associations with Sr, Zr and Ba represent weathering crust. Key words: rare earth elements, trace elements, high-grade iron ore, weathered fillito-shales, weathering crust, hematite, goethite, hydrohematite, berthierine, chamosite, deposit.
Is it possible to clearly differentiate igneous to metamorphic titanite/monazite based on their REE?
e.g. Eu, CE anomaly or enrichment of HREE
can anyone suggest references?
I am beginner researcher working on REE deposit .I am confused to identify mineral generation in thin section which mineral formed first and second and so on . I think mineral generation history is very important to define mineral deposit in good way . Just like below photomicrograph how I identify generation history .Please give me suggestions how I can do it .Thanks
In mafic and ultramafic magma from SSZ ophiolite, the REE has low values, depletion of LILEs and some of HFSEs. To evaluate the subduction components and crustal contamination generally using the Nb/Th - Nb/La ratios. In case of Th has values lower than detection limit. Can be use other elemental ratios for that purpose?
I am looking for the causes that produce a HREE depletion in sedimentary phosphatic chalks of Late Cretaceous.
Thank you for yours answers,
A REE pattern as observed in an intra oceanic tonalite (plagiogranite) such that flatter and low HREE, similar to the primitive mantle with no Eu anomaly. Under what conditions such REE pattern can be achieved? The Hf-O isotope composition of these TTG rocks strongly suggests depleted mantle. Can such a REE pattern be achieved by shallow partial melting of amphibolite underplate?
I study the REE geochemistry of coal samples. Different REE-distribution patterns is drawn when the different background value is selected. There is a negative Ce anomaly when I use chondrite, but it becomes positive when I use the others. I have the same problem with Eu. I don't know that the samples should be interpreted as having positive Ce anomaly (using NASC, UCC, PAAS) or negative Ce anomaly (based on chond. normalized values). Generally the total REE content of the samples are low, ranging from 8 to 50 ppm (below the all background values).
I am looking for any information concerning the prices of neodymium and cerium oxides at different stages of production (i.e. extraction, processing and transformation into a final product). I am interested on price (value prior, during and after production) and industrial impact of these mineral resources.
Any help or suggestion?
I would like to know how should I determine the price of the possible monazite sand? I do have an ICP-Mass test result which indicates elements present (attachment). For a feasibility study I need to determine the price for the raw sand but I do not know any guidelines or references to do so.
Suggestions are more than welcome.
What are the expected RSD values for geochemical analysis of a Standard as well as for samples under study?
Are 1 to 3 values acceptable or values more than 7 are even acceptable?
The question is with respect to trace elements and the REE in igneous rock samples.
Are there any rare-earth elements compatible to be incorporated into biomaterials (impose no or negligible toxicity to the biological cells)?. Thank you.
Researcher working on High Entropy Alloys ,and its related functional property.
Hello every one, I’m a student in university, major in drainage evolution by using provenance tools. Recently, I did some experiments about heavy mineral and trace and rare earth element in modern river sediments. The heavy mineral assemblages mainly the amphibole, magnetite and pyroxene, and I explained these materials sourced from intermediate-basic volcanic rock. However, the chondrite-normalized REE patterns show steep light-REE (LREE) and relatively flat heavy-REE (HREE) shapes with moderate negative Eu anomalies. These REE distribution features are broadly identical to those of UCC. Then the Geochemical data indicate the sediments are sourced from felsic rock. Then I want to ask a question: whether there exits difference of indicating meanings between various provenance tools, not just for heavy mineral and geochemical tools.
If anybody has updated PAAS values of REE's from McLennan, S. M. 1989 or "Rare-earth elements in sedimentary rocks - Influence of provenance and sedimentary processes. Geochemistry and Mineralogy of Rare Earth Elements" entitled paper, kindly attach it.
I accessed a Russian paper " The Use of Lanthanides for the Reconstruction of Phanerozoic and Proterozoic Sedimentation Environments Exemplified by Sections in the Cover and Basement of the East European Platform" entitled (in attachment). I have decided to follow its pattern and all the parameters which author has used in the same. But I am facing a problem during plotting and calculating the parameters because of not availability of raw data in this paper, for example if I want to calculate the ∑Ce/∑y ratio, but what is the mean of ∑Ca:(La-Eu) values similarly, if I want to draw climate interpreter diagram i.e La-(Nd+Sm)+ Y+dYdiagram here, I don't know whether the data is normalised or not. I tried to access the refered Journal i.e. Yu. A. Balashov, Geochemistry of Rare Earth Elements Nauka, Moscow, 1976) [in Russian] but I could not found it.
therefore, you are requested, please share the ideas regarding the aforesaid parameters or its related materials.
i'm looking to claculate REE ratios la/lu, Eu, Ce tell me please how to do?
I would like to measure the REE and TDEE in mice, but i am hardly getting any clue about TDEE and i assumed if REE i can be measured by MRI. MRI which might give us the idea comparatively between two animals based on the Brown adipose tissue chemical energy dissipation.Any insight further into this would certainly be appreciated.
My research now is using the detrital zircon U-Pb dating methods to investigate the potential sedimentary sources.
My sample shows several zircon peaks and if I want to match one peak with a terrane which is the potential source. Is it feasible to compare the REE pattern of the zircons from the sepcific peaks with those from the terrane?
I am trying to find references that can give me an idea of what diagrams of trace elements to use in order to evaluate the possible source of the granites I am currently studying.