安徽省黄梅尖碱性岩体铀成矿地球化学特征

Geochemical Characters of Uranium Mineralization in Huangmeijian Alkaline Pluton in Anhui Province

黄梅尖碱性岩体是庐枞盆地乃至安徽省铀矿地质找矿工作的重点目标和找矿对象。笔者对黄梅尖碱性岩体的蚀变岩石、赋矿围岩、铀矿石进行了化学成分特征和微量元素地球化学研究,结果表明:赋矿围岩具有富钾、碱质高、贫钙镁,以及铝过饱和的特点,其源区可能来源于富集地幔,并受到壳源物质的混染;铀成矿作用过程中,主量元素(Al、Mg、Ca)、微量元素(Sr、Th、Zr、Ta、Nb、U、Hf、Cu、Pb、Zn)和稀土元素明显富集,亲硫元素(Cu、Pb、Zn)可作为寻找铀矿化的指示元素;成矿流体具有深源特征。

Huangmeijian alkaline pluton is the key uranium geology prospecting target in Luzong basin and even in Anhui province.The study on main and trace elements of ores,hosting and alterated rocks indicated that the hosting rock is rich in potassium,high in alkali,poor in calcium and magnesium,and prealuminous,which suggest the rock may be derived from the mantle and contaminated with crust source material.In the process of uranium mineralization main elements Al,Mg,Ca and trace elements Sr,Th,Zr,Ta,Nb,U,Hf,Cu,Pb,Zn and rare earth elements are obvious enriched,Sulfur elements Cu,Pb,Zn can be used as the indicator for uranium mineralization and the ore-forming fluid has the characteristics of deep source.