基于克里格法刻画砂岩型铀矿U、Ra和U-Ra平衡系数垂向分布规律——以二连盆地芒来铀矿床为例OA北大核心CSTPCD

Sandstone-type uranium ore is an important green and economically recoverable energy ore type,which is one of the important types of uranium exploration in the world.The ore bodies of the Manglai uranium deposit in the Erlian Basin and Nalingou deposit in Ordos Basin generally display a tabular shape,and the genesis of these tabular uranium orebodies has attracted much attention.This work aims to study the vertical distribution patterns of U,Ra and Kp(uranium-radium equilibrium coefficient)within the sandstone-type uranium ore bodies in the Manglai uranium deposit of Erlian Basin.The kriging interpolation method with high grid precision was adopted to study the vertical distribution law of U,Ra and Kp,and radioactive samples and the five-point inverse fold accumulation method of quantitative gamma log were utilized to inverse the U content.Then the U content in the sandstone ore body was finely delineated by the kriging method.Results show that the tabular ore bodies in the Manglai deposit display rolled characteristics,and the distribution patterns of Kp can indicate the transport direction of oxygenated uranium-containing water as well as the strength of oxidation.This study will aid to study the morphology of uranium ore bodies,and is of great significance for understanding the uranium ore formation law and subsequent in-situ leaching mining.