Abstract: The factors, which control the formation of the iron ore deposits in the Divriği Region, have been discussed by the useof rare earth element (REE) analyses.The massive iron - ore and the serpentinized ultramafic rock samples both have low REE values close to the condrite values orslightly higher. The light REE contents are relatively higher than those of the heavy REE (LREE / HREE > 1). Negative Ce - and Eu anomalies are characteristic features giving a similar REE pattern for the iron ore and serpentinite samples.The granitic rocks in the Divriği area have high light REE values and low heavy REE giving fairly steep dipping REE curves. Theintrusion of the granitic rocks have hydrothermally altered some parts of the serpentinite, and caused a stock-work type iron ore occurence. The granitic rocks and the hydrothermally altered serpentinite and the stock-work type iron ore show similar patterns with no negative Ce - and Eu anomalies.The parallelism between the REE patterns for the massive iron ore and the serpentinite, established with the previously publishedgeochemical data, indicates the genetic relationship between the iron ore and the serpentinization. A later hydrothermal phase due to thegranitic intrusion has influenced the REE pattern in the altered serpentinite, and indicates that the stock-work iron ore is hydrothermal inorigin.The present investigation proposes a genetic model for the iron ore, where the iron formation is* connected with the serpentinization process. In earlier investigations, the serpentinization process was determined to be prior to the intrusion of granitic rocks, whichcaused the hydrothermal activity.