Rare earth elements characteristics and geological significance of iron deposit in Kuangshancun ore field of Wu’an County, Hebei Province, China

In order to clarify metallogenic differences of iron deposit in different locational environments,the contents of rare earth elements of two types of iron ore and wall rock in ore field of Wu’an County,Hebei Province,China,were analyzed.One is two massive iron ore samples which are from the exterior contact zones of Yushiwa ore deposit(∑w(REE)=10.195×10-6-11.615×10-6,w(LREE)/w(HREE)=11.639-13.160,δ(Eu)=0.844-0.957).The other is three veinlet iron ore samples inside of Wujiazi ore deposit which are in the form of xenolith(∑w(REE)=44.412×10-6- 49.840×10-6,w(LREE)/w(HREE)=4.387-5.724,δ(Eu)=0.306-0.438).The REE distribution of the five samples is right deviation,with slightly negative Eu anomalies,and similar with that of the four rock samples,which show that the origin of ore-forming fluids is closely related with magmatic fluids.In contrast,the total contents of rare earth elements of Wujiazi are high with negative Eu anomalies,and the fractionation of LREE and HREE is weak.Combined with field geological operations,it is speculated that Kuangshancun ore field has certain kinds of ore-forming mechanism closely related with magma expect for skarns ore-forming mechanism.