砂岩型铀矿蚀变矿物研究中的岩心光谱扫描技术

Automated drill core spectral scanning technique in the study of altered minerals in sandstone-type uranium deposits

以松辽盆地典型砂岩型铀矿钻孔岩心归档资料为基础,系统总结了岩心光谱扫描技术在砂岩型铀矿中的应用流程,并在前人光谱强度与矿物含量研究的基础上,补充开展了不同时间域的矿物扫描结果对比。研究结果表明,岩心光谱扫描技术能快速、有效地提取岩心中的蚀变矿物空间分布信息,开展蚀变矿物填图,包括常见的粘土矿物、硫酸盐矿物、碳酸盐矿物和Fe^(3+)氧化物等;沉积岩长期放置带来的风化作用对光谱数据的影响主要反映在蚀变矿物的整体含量变化上,对蚀变矿物种类未产生明显变化;利用岩心光谱扫描技术完成的蚀变矿物填图,获取的宏观蚀变矿物及其组合变化对砂岩型铀矿地层划分、氧化还原分带、成矿流体特征反演和矿床勘查等具有重要意义,应用前景广阔。

Taking the drilling core of typical sandstone-type uranium deposit in Songliao Basin as the object, we summarize the application process of core spectral scanning technology in sandstone-type uranium deposits. And on the basis of previous research and the spectral intensity of mineral content, the contrast of mineral scan results are made in different time domain.The results show that the core spectral scanning technique can rapidly and effectively extract the spatial distribution information of altered minerals in the core of the rock, including common clay minerals, sulfate minerals and carbonate minerals and Fe3＋ oxide. The influence from long-term core weathering on the spectral data is mainly only less than 5% change of the total content of altered minerals, and has no obvious change in the types of altered minerals. The alteration minerals and their combination changes obtained by core spectrum scanning technique are of great significance for stratigraphic division, redox zoning and characteristics inversion of ore-forming fluids, and have wide application prospects.