滇东富乐铅锌矿区地层稀土元素地球化学

通过对罗平富乐铅锌矿区地层及矿石进行了稀土元素地球化学特征对比研究.结果显示,梁山组样品 ΣREE值25.91×10-6~108.40×10-6,δEu值0.35~0.73,δCe值0.64~1.35.具Eu负异常和Ce弱正异常;阳新组碳酸盐岩样品 ΣREE值0.82×10-6~6.75×10-6,δEu值0.15~0.97,δCe值0.22~0.62,具Eu负异常和Ce负异常;玄武岩样品 ΣREE值204.17×10-6~290.57×10-6,δEu值变化范围0.91~0.97,δCe值1.02~1.03,Eu异常和Ce异常不明显.峨眉山玄武岩、阳新组、梁山组岩石与矿石REE配分模式比较区别明显,暗示成矿物质并非这些地层提供另有其它来源;梁山组及含矿地层阳新组样品为轻稀土富集型,并具有Eu负异常,暗示地层可能形成于被动大陆边缘还原环境.

A study on REE geochemistry of stratain Fule Pb-Zn mining area of eastern Yunnan

This paper conducted research on the REE geochemical characteristics of strata and ores in Fule Pb-Zn mining area of Luoping.The results indicated that:ΣREE,δEu and δCe of the samples from Liangshan Formation were 25.91×10 -6 -108.40×10 -6 ,0.35-0.73,and 0.64-1.35 respectively with negative Eu a-nomaly and weak positive Ce anomaly,while ΣREE,δEu and δCe of basalt samples were 204.17 ×10 -6 -290.57×10 -6 ,0.91-0.97 and 1.02-1.03 respectively without obvious Eu anomaly and Ce anomaly.REE distribution pattern in Emeishan basalts,rocks of Yangxin Formation and rocks of Liangshan Formation were different from that in the ores,and the fact implied that the metallogenic materials were not provided by these strata but by some other sources.Most samples from Liangshan Formation and ore-bearing Yangxin Formation were LREE-enriched with Eu negative anomaly,and it implied that the strata was possibly formed in a reducing environment of passive continental margin.