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Clive: I'm not familiar with the Toyoda and Tokanami paper...could you please send the complete reference. I'm not sure if this aspect is important but remember that with fish and conodonts the apatite is biogenic....I don't know if that makes much difference with respect to incorporation/fractionation of REE. I think across the spectrum of REE...yes they likely fractionate (the LREE are preferentially incorporated into biogenic apatite). For myself...I only worry about Sm/Nd and I'm not too worried about them fractionating from each other...(YET). What do you think? Cindy ---------------------------------- Cindy Wright School of Earth and Ocean Sciences University of Victoria
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