Geochemical indicators of trace element in Li-F granite liquid segregation.

The results of trace element determination of 195 Li-F granite samples from China and other countries indicate that with the variation of Li-F granite facies from the lower to the upper, there are negative correlations betwee n Zr/Hf and F and Nb/Ta and F; the contents of Ta(Nb), Sn, W and Al increas e and the ratios of Nb/Ta(Zr/Hf) decrease with the F content increase. The topazites are plotted in the down-left side of correlative oblique line in the diagram K/Rb-Rb of Li-F granite. The Li-F granites show the lower Li an d K anomaly in the diagram Li-K, and Rb/Sr unusual anomaly (2 similar to 3 magnitudes) in the diagram Rb/Sr-P2O5. All of these facts are the indicator s of the liquid segregation mainly with vapour-liquid fractional distillati on. The contents of main and trace elements in neighbourhood rock facies (x ianghualingite and ongonite) are characterized by variation of a saltation and heterogeneity; The contents of main elements such as F, K, Fe, Mn, Mg(o r Ca) and trace elements such as Rb (or Cs), Zr (or Hf), Nb (or Ta), Th, W, Sn(or Mo), Ba (or Sr) etc in xianghualingite are richer than those in ongo nite. Therefore, the xianghualingite rich in F, K, Fe and poor in Si, Na, a nd the ongonite poor in F, K, Fe and rich in Si, Na are conjugate and salta tory in compositions of rock pair. This can be considered as the indicators of liquid segregation mainly with the immiscibility of Li-F granite.