Document Type : Original Research Paper
Authors
1 Department of earth sciences, Faculty of earth sciences, Bu-Ali Sina University
2 Research institute earth sciences G.S.I .
3 Department of earth sciences, Faculty of earth sciences, Bu-Ali Sina University.
4 Department of earth sciences, Faculty of earth sciences, Shiraz University.
5 Parsi Kan Kav consulting engineers company.
Abstract
The Qahr-abad fluorite deposit is located ~58 km southeast of Saqqez city, Kurdistan province. This deposit is developed as scatter lenses, veins, and veinlets (stockwork structure) within carbonate rocks. Violet, green and colorless fluorites are recognized. Quartz, dolomite, calcite and barite are gangues. REE geochemistry of the area suggests that the REE content of the fluorites lies between 20.18 and 48.38 ppm. The relatively higher concentration of LREEs in violet and colorless fluorites suggests that they formed in the first stages of mineralization. The calculation of Eu anomalies suggest that the fluorites formed in alkaline to neutral and to some extent oxidizing conditions because the Eu anomaly cover a narrow range around 1. The calculation of Ce anomaly which is negative, also confirms the oxidizing conditions for mineralizing fluids. Finally, by the studies of REE geochemistry it can be concluded that Qahr-Abad fluorite deposit is a product of hydrothermal activity of epithermal type and the mineralizing fluids are of magmatic or basinal origin by which the presence of magmatic activity in this district, it can be explained.
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