Geochemistry of Fluorite Mineralization in Kaman, Kirsehir, Turkey

Fluorite occurs within syenite, nepheline-syenite, and monzo-syenite in the study area, which includes Bayindir, Isahocali, Yeniyapan, and Alisar of Kaman area, Kirsehir, Turkey. The fluorite occurrences are localised along fractures and fissures in the host rocks and as dissemination within the host rocks. The fluorites are purple, dark purple, pinkish purple, green, and white in colour. The thickness of the fluorite veins range up to 50-60 cm. The results of the fluid inclusion study reveal that the homogenization temperatures in fluorites of Bayindir, Isahocali, Yeniyapan, and Alisar regions range from 110°C to 330°C. Field observations and fluid inclusion microthermometry indicate that the fluorite occurrences are hydrothermal in origin. The Rare Earth Element (REE) contents of Bayindir, Isahocali, and Yeniyapan fluorites reach up to 200 ppm. However, the REE contents of Alisar fluorites are as high as 1000 ppm. The Light Rare Earth Element (LREE) contents of Alisar fluorite are 50 to 500 times higher than those of other localities. All of the fluorites have negative anomalies of Ce, Gd, and Yb and positive anomalies of Pr, Tb, and Tm. The negative anomalies of Ce and positive anomalies of Eu imply that the hydrothermal fluids responsible for fluorite precipitation are characterized by high oxygen fugacity.