白银厂中部成矿带稀土元素地球化学特征的研究

稀土元素在国外已广泛用于岩石学和矿床成因方面的讨论。随着我国测试技术的进步和分析精度的提高,从稀土元素的角度研究岩石和矿床的某些规律,有助于我们对地质现象的认识和解释。众所周知,白银厂是我国老一辈地质学家解放初期发现和勘探成功的大型块状硫化物矿床。地质部和冶金部地质队投入了大量的钻探工程和大比例尺填图。地质科研院、所、大专院校,从不同领域进行较全面的地质研究工作。然而,矿床开采已接近尾声,认识上还不统一。我们为提高对白银厂地区地层、细碧石英角斑岩建造、矿床成因的认识,企图从稀土元素方面提供某些信息,本文是我们对其结果初步研究的成果。

A DISCUSSION ON REE GEOCHEMICAL CHARACTERISTICS OF THE MIDDLE ORE ZONE IN BAIYINCHANG MINE

Based on the study of REE geochemical features for 25 rock and ore samples, the evidences show that spilite is Eu-and LREE-rich, with generally accordant REE pattern, while quartz keratophyre is LREE-rich and no Eu-depletion, also with generally accordant REE pattern.The ratios of Sm/Nd and Eu/Eu have a slightly decreasing trend from spilite to quartz keratophyre.But, in general way, the two are similar, indicating their close relationship in genesis.The metallogenic substances seem to have derived from the crust or the mixture of the crust and mantle.