identification of fe3+ content in epidote from varan, urumieh-dokhtar magmatic arc, iran: using ftir and raman spectroscopy

This study is aimed to determine the fe content in natural epidote from varan area (urumieh-dokhtar magmatic arc, iran) byusing vibrational ftir and raman spectroscopy and epma analyses. fe3+ concentration calculated from ftir spectroscopic data isin the range of 0.96 to 1 apfu. the results are in complete agreement with epma data. the comparison between obtained ramanspectra of studied epidote grains and those from the rruff database suggest that epidote from varan area is rich in fe3+. high fe3+content might reflect moderate to high oxygen fugacity during the crystallization of epidote. this short paper demonstrates that thequantification of the fe content in epidote via ftir method is as good as epma, whereas the utilization of a low-cost ramanspectrometer helps in quickly distinguishing between fe-rich and fe-poor epidote, which even could be useful in the case of fieldstudies.