Geochemical studies of the Pinavand Fluorite Mines indicates that
fluorite has been deposited from a high salinity, typically low temperature
and Mg-rich fluid in two stages: Based on geothermometrical data, at the
first stage fluorites were formed at relatively high temperature (85-235Cº)
and accompanied by host rock replacement (in the form of epigenetic
dolomitization). The second stage of fluorite mineralization has occurred at
low temperature (65-115 ºC) and has formed lodes and vein-likes along the
breccia and fault zones. However, the salinity was relatively invariable (15-
23 wt% NaCl), suggesting salinity of fluorite-forming fluid was the same at
all occurrences. By studying of REE patterns and regarding to some ratios of
HREE to LREE, it could be observed that the first stage of fluorites was
enriched in LREE revealing mineralization has occurred in early stage of
crystallization .In contrast, the second stage of fluorites containing high
proportion of HREE were deposited in the last stages of crystallization
event. Based on the calculated (Yb/La), (Yb/Ca), (Tb/La) and (Tb/Ca) ratios,
two mechanisms could be proposed: assimilation (replacement) for the first
type fluorites and remobilization (rejuvinilization) for fluorites of the second
stage.