Epithermal Kizilcaoren Fluorite-Barite REE Deposit, Eskisehir, Turkey: Preliminary Results

Kizilcaoren is a Vein-Type, fault controlled Fluonte-Barite-Rare earth element (REE) deposit and forms the only economic REE and thorium source of Turkey. The Ore-Bearing veins formed by hydrothermal solutions originating from alkaline volcanism occur in a wide variety of host rocks ranging from metasandstones to pyroclastics. The host rocks show three types of hypogene alteration of varying intensity silicification, argillic alteration, and sericitization. Three man economic ore types identified were fluorite ore, massive barite ore, and bastnaesite +fluorite+barite ore.

Fluid inclusion measurements from barite and bastnaesite show low salinity of 0 5 - 9 5 eq wt % NaCl and homogenization temperatures of 105° and 246°C respectively Fluorite was formed from slightly higher salinity (<124 wt % NaCl equiv ) fluid sat Low- and Moderate-Temperatures (163°-336°C). Relatively Low-Salinity and lowand moderate temperature inclusions might be the result of mixing of Deep-Saline brines with Low-Salinity meteoric fluids Sulphur isotopic composition suggests a source similar to that of the hydrothermal fluids which are compatible with volcanogenic sulphate field.