REE Geological Characteristics of Checun Fluorite Deposit in Song County, Henan Province

This article tested the combination of rare earth elements on fluorite samples, in order to explore the indication of the geochemical characteristics of rare earth elements on the source of ore-forming materials and the characteristics of ore-forming fluids in the Checun fluorite mine. It is found that the rare earth element distribution patterns of fluorite single minerals are divided into two categories, through the REE geochemical study of fluorite ore in Checun area. The first type of fluorite single mineral has a rare earth element distribution pattern similar to that of Heyu granite; The rare earth element distribution pattern of the stone single mineral is relatively flat, with obvious characteristics of the rare earth source distribution pattern. The fluorite mineral has a high total amount of rare earth elements, ∑REE=47.3×10-6~119.1×10-6, δEu=0.35~0.88, which is moderately negative, δCe=0.90~1.37, weak abnormal. The REE pattern of Heyu granite is slightly right-dip, and the total amount of rare earth elements is higher. ∑REE=17.1×10-6~239.2×10-6, δEu=0.32~1.95, positive and negative anomalies exist simultaneously, δCe=0.96~2.19, the positive anomaly is dominant. The Eu and Ce anomalies of fluorite minerals suggest that the Checun fluorite ore is in a medium-low temperature and reduced ore-forming system during the formation process. The formation of fluorite has undergone a process from relative high temperature to low temperature. The fluorite Y/Ho ratio is 12.98~42.20, which shows obvious migration and zoning characteristics. It indicates that there is a large amount of exogenous substance addition and component exchange during the formation of the deposit. The ore-forming fluid has Ca assimilation and mixing effect on the surrounding rock. It is basically determined that the porphyrite deposit in the Checun is related to the magmatic hydrothermal fluid in the late stage of the Heyu granite, combined with the chronology of mineralization. The deposit type is the hydrothermal fluorite deposit in the middle and low temperature magmatic stage. © 2020, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.