新疆可可塔勒铅锌矿床稀土元素地球化学的初步研究

PRELIMINARY RESEARCHING ON REE GEOCHEMISTRY OF THE KEKETALE LEAD-ZINC DEPOSIT,XINJIANG

可可塔勒铅锌矿矿石和围岩的ＲＥＥ分布模式类似于酸性岩类和泥质碎屑岩类矿石。ΣＲＥＥ值多小于围岩，不同类型矿石ＲＥＥ模式有明显差异。矿石在表生氧化过程中趋于富集轻稀土、贫化重稀土。蚀变围岩ΣＲＥＥ略有增加，Ｅｕ亏损明显。矿石主体形成于开放或近开放体系，含矿热液富含Ｃｌ－。蚀变岩石相对于未蚀变岩石、铁帽相对于原生矿石、以及铁帽上方土壤的ＲＥＥ分布特征是找矿评价的ＲＥＥ依据。

The ore and wallrock of the Keketale Ph-Zn deposit show REE pattern features similar to the acidic rocks,which is related to the acid magmatism. For the MREE,La and Lu in ore are concentrated and the clear differrences have been found out in different ores. LREE is higher and HREE is lower in gossan than in ore. REE and Lu of altered wallrocks are higher than that of unaltered wallrocks and the depletion of Eu in the former is obvious. It is estimated that the ore was formed in an open or semiopen system and clorine was concentrated in ore-bearing solution. The clear differences in different samples are very useful for geochemical prospecting of ore bodies.