The spider diagrams of REE in plagiogranites does not have any Eu anomaly. How can I remove the effect of plagioclase to get the Eu anamoly in plagiogranite? Can anyone help me?
Dear Dr. Nayak,
plagioclase has a significant impact on the variation of REE in general and Eu, in particular. For a tailor-made answer it seems to me essential to know exactly what your study is aimed at. Otherwise it is difficult distil the gist out of your question. I do not fully understand the sense of what you call a "removal" of the Eu anomaly.
Best regards
H.G.Dill
Indeed, we need to know a bit more information about the rocks in question. What kind of Eu anomaly do you think the rocks should have if you remove the effects of plagioclase? Do you think the parent magmas have fractionated or accumulated plagioclase? Is that what you are trying to achieve, calculate a potential composition of a parent magma?
Regards
Jeremy
Sir Dill
Plagiogranites from ophiolite belts usually have negative Eu anomaly, but plagiogranites samples from Naga Ophiolite Belt does not show any Eu anomaly. How can we remove the effect of plagioclase so as to have a negative EU anomaly?
Sir Preston,
Thank you for your response...It should have be negative anomaly and the parent magmas have fractionated plagioclase. But how do we calculate a potential composition of a parent magma?
As Bo Peng suggests, the first step in being able to model fractional crystallization or accumulation, would be to analyse some plagioclase separates from your samples for REE. You should also look at some of the other possibilities, as there are numerous accessory phases that may have affected your REE profiles....apatite, titanite, allanite?
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