You can find an attached pdf with my paper related to the topic you asked. It is in Russian, but the main content is concentrated in the figs having English captions.
Regards,
Andrey Tkachev
It should be the other way round. HREE is concentrated in Y-bearing regimes and hosted by xenotime. When the HREE are scavenged from the system the relative amount of LREE can also go up.
HGD
The most promising source rocks for LREE ore deposits are carbonatites, particularly those enriched in magnesium and iron. LREE host minerals: carbonatites are known to host minerals that concentrate LREE. These minerals mainly include monazite and burbankite. Monazite is most common in potassium-enriched carbonatitic magma. It forms during the early stages of crystallization of carbonate magma and is relatively stable. Burbankite is found in sodium-enriched carbonatitic magma. It is an unstable mineral that dissolves easily and is replaced by minerals such as bastnaesite. It is important to note that the presence of burbankite in carbonatite is a good indicator of the concentration of LREE in that carbonatite.
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