内蒙古狼山地区的层控铀矿及其控制因素的卫片影象模式

狼山地区广泛分布着花岗岩型铀矿化和砂岩型铀矿化。本文通过对该区的遥感地质综合解译,重点研究了几个含铀盆地的砂岩型铀矿化成矿特点及其通感图象的影象特征,发现广布于早白垩世断陷盆地的砂岩型铀矿化是一典型的层控型铀矿。并通过区域构造型式的研究,强调了弧形构造的断块活动特征及其对含铀盆地和含矿层分布的控制作用;揭示了弧形构造的后期活动和环形构造、北北东向线性构造与铀矿化的再造关系。从而得出砂岩铀矿化是受地层岩相和弧、环、线构造“四位一体”条件控制的新认识。该矿化在MSS图象上呈现一定的影象特征,据此,本文概括出本区层控铀矿的影象模式。

STRATA-BOUND URANIUM MINERALIZATION AND SATELLITE IMAGE MODEL OF ITS CONTROLLING FACTORS IN LANGSHAN AREA, INNER MONGOLIA,

Granite type and sandstone type uranium mineralizations are extensively distributed in Langshan Area. Through comprehensive interpretation for remote sensing geology, this paper puts emphasis on iesearch on metallogenic characteristics of sandstone type uranium mineralization and remote sensing image features for several uraniferous basins, and the author has found out that sandstone type uranium mineralization widely distributed in Early Cretaceous down-faulted basins is a typical strata-bound type uranium deposit. And based on research on regional structural pattern, block movement characteristics of arcuate structure and its control over the distribution of uraniferous basins and ore-bearing beds are emphasized. It reveals that there existed apparent reworking relationship between late stage activity of arcuate structure, ring structure, NNE trending linear structure and uranium mineralization. It can be concluded that sandstone type uranium mineralization was controlled by sedimentary facies and arcuate, ring and liner structures. Finally this paper has outlined the image model of strata-bound uranium mineralization which appears some image characteristics on MSS image.