东川滥泥坪—白锡腊铜矿区稀矿山式铁铜矿矿石地球化学特征及其成因

Ore geochemical characteristics and genesis of Xikuangshan type Fe—Cu deposit in Lanniping—Baixila copper mine of Dongchuan

在比较滥泥坪—白锡腊铜矿区因民组地层的基础上,厘定了因民组稀矿山段在本区的存在,认为具有含矿性,并在有利地段布设了探矿工程。对揭露矿体的矿石地球化学特征分析比较表明,矿石(K2O+Na2O)含量、K2O/Na2O值与因民矿区类似,矿石稀土元素总量为(55.94～367.72)×10-6,(La/Yb)N=5.09～67.57,LREE富集,铕异常(1.69～5.18),与现代大洋底热液稀土元素具相同的特征,表明成矿流体为深部高温、还原性质。

On the basis of the correlation of Yinmin Formation from Lanniping-Baixila copper mine area, the authors confirmed the existence of Xikuangshan type deposit in the studied area, and designed mineral exploration engineering in favorable sectors. Analysis and comparation of geochemical characteristics of the exposed orebody revealed that （K2O ＋ Na20） contents and K2O/Na2O ratio of ores are similar to in Yinmin mine area. REE contents are （55.94- 367.72）× 10^-6, （La/Yb）N = 5.09 -67.57 with strong enrichment of LREE and positive Eu anomaly. The REE characteristics are similar to hydrothermal solution of modern ocean floor, which shows that oreforming fluid was in deep high-temperature with deoxidation nature.