铜陵凤凰山铜多金属矿磁铁矿单矿物稀土元素特征研究

通过对铜陵凤凰山铜多金属矿不同部位的磁铁矿单矿物的稀土元素配分分析,发现从矿体的底板经过中部到顶板,磁铁矿中稀土元素总量平均值不断升高,依次为11.30×10-6,29.34×10-6和86.15×10-6,δ(Eu)平均值依次为0.62,1.23和2.04.与超覆于矿体之上的花岗闪长岩体和矿体下伏的围岩(灰岩)的稀土...

On characteristics of rare earth elements in magnetite monomineral from the Fenghuangshan copper polymetallic deposit,Tongling,Anhui

Analysis of REEs in magnetite monomineral from foot wall, through middle part to hanging wall of the Fenghuangshan copper polymetallic deposit shows increase of the averages of ∑ REE in magne tite monomineral which are 11.30 ×10-6 , 29.34×10-6 and 86. 15 ×10-6 respectively with average δEu values varied from 0.62, 1.23 to 2.04. Comparison of REE contents of the deposit with those of the over- lying granodiorite and the underlying limestone indicates that REE content of orebodies are mixture of those of magmatic rocks and strata in different proportions and ore materials are multiple sources. No obvious Eu anomalies of the rockbodies and the wallrocks demostrates the strong enrichment of Eu in the early ore fluids, and lower redox potential caused by the organic matter in the wallrocks. Accoding to the variograms of La/Sm-La and Ce/Yb-Eu/Yb, we infer that the igneous rocks in this region are dominantly formed by partial melting and separative crystallization during late mineralizations.