伊犁盆地512铀矿床粘土矿物特征与铀成矿作用

CHARACTERISTICS OF CLAY MINERALS AND THEIR RELATIONSHIPS WITH URANIUM MINERALIZATION IN URANIUM DEPOSIT No.512, YILI BASIN

对５１２铀矿床粘土矿物质量分数、分布特征进行了较全面的分析，指出该矿床中粘土矿物以成岩期为主，在后生成矿作用中又叠加了新的粘土蚀变产物，各亚带粘土矿物组成基本类似但又存在一定差异．粘土总量和蒙皂石能较好地反映各亚带的成矿物理化学条件的改变；粘土矿物对Ｕ有明显的吸附富集作用，但又有抑制作用，即粘土质量分数过高或氧化带粘土蚀变太强烈不利于铀在过渡带沉淀富集成矿．此外，对粘土矿物成分对地浸工艺开采过程中的不利影响进行了分析，提出地浸工艺中必须重视对粘土组分的研究．

The analysis of component mass fraction and distribution of clay minerals in uranium deposit No.512, reveals that most of clay minerals were deposited with the sandstone, partly resulting from the epigenetic alteration. The mass fraction of total clay mineral and smectite can well reflect the changing trend of physical_chemical conditions. The components are similar over all but partly different in sub_interlayered zones in the deposit. Clay minerals can obviously absorb and enrich uranium, but also restrain the uranium enrichment. Finally analysis is made of some unfavourable effects on in_situ leaching techniques resulting from different clay minerals, it is pointed out that more reseach on components of clay minerals should be emphasized in the course of in_situ leaching.