The formation of fluorine rich magmas by fluid filtration through silicic magmas was described. Retrograde magma boiling in a large magma chamber produced an increase in pressure which resulted either in explosive ejection ...
High-F silicic (HS) rocks have some characteristic geochemical features. The REE distribution, for exam-ple, is characterized by approximately equal chondrite-normalized abundances of LREE and HREE (equal-arm distribution) ...