I am working on a suite of volcanic rocks which exhibit high initial 87Sr/86Sr ratio. In some samples the ratio is as high as 0.749267 ( and 143Nd/144Nd = 0.512580). Geochemically, the samples are also enriched in a wide range of incompatible trace elements including LILEs and HFSEs.
I wonder if someone has faced with these kinds of unusually enriched Sr-Nd magmatic rocks in the literature to suggest some papers.
It should be mentioned that the accuracy and precision of the results are confirmed by the results obtained by analyzing international standard samples during the runs.
Thanks.
Hi Leonid,
The ratios were obtained from intermediate alkaline rocks. Although enrichment of the source over a long period of time can have a great impact on the isotopic signatures of the segregated melt but I still think the ratios are too high. The rocks are enriched but not so old (40 Ma). For a sample with a present 87Sr/86Sr=0.749, the initial ratio is calculated as high as 0.731.
Thank you so much Leonid for your prompt reply, I wonder if my question rang a bell to suggest a few papers,
anyway, I really appreciate your help.
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