多元信息分析技术在460地区深层构造研究及找矿中的应用

THE APPLICATION OF THE ANALYTICALT ECHNIQUE OF MULTI-DATA TO THE RESEARCH OF SUBSURFACE STRUCTURES AND URANIUM EXPLORATION IN THE AREA No.460

在华北地台北缘中新生代火山岩发育区,发现大型铀钼矿床,其外围被第四系广泛覆盖。为了进一步扩大找矿,我们采用了以遥感图象、地质图件、航磁、航放资料为基础信息的多元信息计算机综合分析技术。通过已知成矿模式的建立,对与成矿有关的地质体与基础信息源之间的相关性研究,对这些相关信息在图像处理系统中进行的组合显示分析,从而确立了各类地质体及控矿地质要素复合集聚区的多参数影像模型;查明了它们的空间分布规律;圈出了5个主体火山机构;发现了大规模蚀变带及其与铀矿化异常之间的空间相关关系。据此编制出反映该区成矿地质环境的第四系覆盖层下深部地质构造影像图及成矿远景区影像图,在某一远景区内用航空彩色红外图像及侧视雷达图像进行解译,圈定了5个隐伏次火山岩体。经钻探验证了它们的存在并发现工业铀矿化。这一切都为已知矿区的外围扩大找矿工作起了指导作用。

A large U-Mo deposit was found on the northern margin of North China Platform, where the Mesozoic and Cenozoic volcanics are developed. This area is widely covered by the Quaternary sediments. To find more deposits of such type in the area, the integrative analytical technique of multidata on computer is employed upon the basic data of remote sensing imagery, geological maps, airborne magnetic and radiometric surveys. After the uranium mineralization model is established, the correlation between the geologic bodies, which are related to the mineralization, and the basic data is studied. Furthermore, the correlation information is analyzed on image processing system by composite displaying. Thus. the image model of multi-parameters is established, which is for determining the overlap of various geologic bodies and elements controlling the mineralization Also, the distribution of the elements controlling the mineralization becomes known And five major volcanic apparatus are delineated.The large alteration zones, and the uranium relationship between these zones and the uranium anomalies are found. It is important that the subsurface geologic map and the potential exploration target map are compiled. In one of the target areas predicted by this technique, the geologic interpretation on airborne colour infrared and sidelooking radar images is made, locating five concealed subvolcanic intrusions. Thc drilling indicates the presence of the intrusions and the rich uranium mineralization. The research plays a guiding role in extending uranium exploration over the study area