Hi, Yuri. I'm currently working on REE and trace element contents in pyroxenes and amphiboles from peralkaline granites. Regarding specifically these minerals, you can start checking out:
Reguir et al (2012) Lithos, 128-131: 27-45 (DOI: 10.1016/j.lithos.2011.10.003)
Piilonen et al (2013) Canadian Mineralogist, 51: 735-770 (DOI: 10.3749/canmin.51.5.735)
Marks et al (2004) Chemical Geology, 211: 185-215 (DOI: 10.1016/j.chemgeo.2004.06.032)
For the analysis of REE , ICP-MS is one of the the best technique and widely used. Mostly for all type of rocks,results are well published. For example :
V.Balaram,C.Manikyamba,S.L.Ramesh, and V.K.Saxena 1990.
Determination of Rare Earth Elements in Japanese Rock standards by ICP-MS.
I have one or two publications in this area which you should be able to find in my profile. Good luck with your data. Do get in touch if you have any queries about the technique.
we have a paper accepted with moderate revision in American Mineralogist dealing with Kd on plagioclase, alkali feldspar, Ti-magnetite, biotite and apatite in felsic alkaline volcanic rocks (potassic trachytes and trachyphonolites) from Phlegrean Fields. As soon as we have the paper definitively accepted I can send you the data.
Oter literature data can be found in Villemant (1988; CMP, 98, 169-183) and Pappalardo et al. (2008; CMP, 156, 1-26).
In Fedele et al (2009; CMP, 158, 337-356) you can find Kd of cpx in equilibrium with the same liquids (potassic trachytes and trachyphonolites) from Phlegrean Fields.